Technical Incident Report: Analysis of Reported Failures in Scion Vehicles
1.0 Introduction
This document provides a systematic analysis of customer-reported incidents across various Scion models, including the FR-S, IA, iC, iM, iQ, tC, xA, xB, and xD. The objective of this report is to categorize and assess the frequency and potential severity of these incidents to support ongoing engineering review and safety recall coordination. The analysis is based exclusively on the provided customer complaint narratives, which have been used to identify patterns of failure within specific vehicle systems and across the model lineup.
Get complete access to this detailed incident analysis
Get complete access to this detailed incident analysis
Get complete access to this detailed incident analysis
This document provides a systematic analysis of customer-reported incidents across various Scion models, including the FR-S, IA, iC, iM, iQ, tC, xA, xB, and xD. The objective of this report is to categorize and assess the frequency and potential severity of these incidents to support ongoing engineering review and safety recall coordination. The analysis is based exclusively on the provided customer complaint narratives, which have been used to identify patterns of failure within specific vehicle systems and across the model lineup.
2.0 Scion FR-S: Incident Analysis
The Scion FR-S exhibits a notable concentration of high-frequency complaints within its core mechanical systems. This section deconstructs reported failures by specific vehicle systems, evaluating the nature of the complaints and the designated "Widespread Level" to identify potential patterns of concern for this model. The analysis reveals significant issues related to the engine and power train, warranting close examination.
2.1 High-Frequency Issues: Engine and Power Train
2.1.1 Engine (Widespread Level: High)
Analysis of engine-related complaints reveals a pattern of severe and potentially catastrophic failure modes. The primary issues described by customers include rod bearing failure, which in some cases is attributed to oil starvation resulting from excessive factory sealant blocking oil passages. Other significant reported failures include camshaft gear defects that affect variable valve timing, persistent check engine light illumination that dealers struggle to diagnose, and sudden, unexpected stalling.
The operational severity of these failures is high, with multiple reports of critical incidents that pose a direct safety risk. These include complete engine shutdown while driving and sudden, dangerous slowdowns on public roadways.
Most Severe Complaint Summaries Identifying IDs
Rod bearing failure due to factory sealant defect causing oil starvation and sudden slowdown. 1334413
Engine experienced rod knock for two miles before completely shutting down while driving. 1314504
While driving at only 5 MPH, the engine stalled without warning. 1234911
Camshaft gear defect prevents variable valve timing adjustment, causing the engine to shake violently as if it is going to stall. 1157368
Persistent check engine light issues that dealer service centers were unable to resolve over multiple visits. 937993
2.1.2 Power Train (Widespread Level: High)
Power train complaints are closely related to the engine issues and are also designated as high frequency. Recurring themes identified in the narratives include transmission grinding even with the clutch fully depressed, catastrophic clutch failure where the component broke in half, and damaged direct injectors leading to violent popping sounds during acceleration. Additionally, reports cite jerky and hard downshifts in automatic transmission models.
Several complaints correlate directly with engine issues, such as ID 1232870, which reports both consistent ignition coil faults (engine) and severe transmission grinding that required a full replacement (power train).
2.2 Low to Emerging Frequency Issues
Complaints across several other systems were reported at a lower but still notable frequency. In the AIR BAGS system (Emerging), reports describe overly sensitive passenger seat sensors and potential ABS failures. ENGINE AND ENGINE COOLING issues (Low) primarily consist of abnormal engine sounds and customer interactions related to NHTSA Campaign Number 18V772000. The FUEL/PROPULSION SYSTEM (Low) shows a pattern of high-pressure fuel pump noise, fueling difficulties (crimped filler hose, overflow), and component failures following valve spring recall work. Most critically, STEERING complaints (Low) detail incidents of random and complete power steering loss, binding, and clunking sounds, which present a significant safety risk.
Multiple complaints were filed under the ELECTRICAL SYSTEM, describing ignition coil failure, issues related to a valve spring recall, and a spark plug that popped out of the engine. SERVICE BRAKES complaints describe brake failure, ABS non-function, and rear caliper malfunction. The WHEELS category contains reports of wheel bolts, studs, and lug nuts repeatedly failing and breaking. Other low-frequency issues include sticking SEAT BELT latches, a loose STRUCTURE:BODY shift knob, and illuminated SUSPENSION warning lights. Finally, issues categorized as UNKNOWN OR OTHER (Low) include reports of engine knock post-recall and at least one engine fire.
2.3 Unique Incidents
Several systems had only single-report incidents. These are documented below for comprehensive tracking.
System Reported Widespread Level Summary of Complaint Identifying ID
ELECTRONIC STABILITY CONTROL (ESC) Unique Steering wheel is loose and pulls to the left on its own. 1362078
EXTERIOR LIGHTING Unique Check engine and traction control lights illuminated, causing loss of power. 1470204
FUEL SYSTEM, GASOLINE Unique Check engine light illuminated on a vehicle with 8,500 miles. 1061545
LATCHES/LOCKS/LINKAGES Unique Smart key signal interference prevents the owner's key from locking/unlocking the car. 976599
SEAT BELTS:PRETENSIONER Unique Seat belt pretensioner failure correlated with door ajar warning light. 1709078
TIRES Unique Tire and rim destroyed while driving on the interstate. 1080749
VEHICLE SPEED CONTROL Unique Persistent check engine light that the dealer could not diagnose or fix. 937994
VEHICLE SPEED CONTROL:CRUISE CONTROL Unique Generic CPSC complaint reference. 1023924
The analysis will now proceed to the Scion IA model.
3.0 Scion IA: Incident Analysis
This section examines reported failures across the systems of the Scion IA. While reported at a "Low" frequency, the incidents cluster around critical electrical, engine, and power train systems and present notable safety concerns that merit review.
3.1 System Failure Analysis (Widespread Level: Low)
AIR BAGS
Analysis of air bag complaints reveals a pattern of non-deployment during significant collisions. Multiple narratives describe crashes where the airbags were expected to deploy but did not, including one incident involving a collision with a wild horse and another where the vehicle was hit from behind and pushed into the car in front.
ELECTRICAL SYSTEM
Electrical system failures are characterized by erratic and distracting behavior. Reports detail multiple dashboard warning lights blinking simultaneously, followed by the engine entering a low-power mode. Other complaints describe infotainment system failures requiring costly replacement and instances of the trunk popping open randomly while driving.
ENGINE
Engine-related incidents include reports of violent shaking at idle, as if the engine is about to stall, and intermittent, complete shutdowns while the vehicle is in motion. A particularly concerning report describes an instance of unintended acceleration while parking, where the vehicle sped up despite the brake pedal being depressed, resulting in a collision with a building.
POWER TRAIN
Power train issues often overlap with engine complaints. Narratives describe horrible grinding sounds and violent lurching when shifting into reverse, as well as erroneous downshifting that causes the vehicle to decelerate abruptly while driving.
3.2 Unique Incidents
Unique incidents for the Scion IA are documented in the table below.
System Reported Widespread Level Summary of Complaint Identifying ID
SERVICE BRAKES Reports of unintended acceleration when depressing the brake pedal and loud noise from brakes on cold start. 1397225, 1477140, 1505242
STEERING Unique Poorly wired and spliced wires identified as a potential fire hazard. 1836373
STRUCTURE:BODY Unique The car trunk pops open randomly while the vehicle is in motion. 1567277
UNKNOWN OR OTHER Unique Disparate issues reported, including unintended acceleration, intermittent vehicle shutdown, and a complaint related to an oil change. 1388126, 1505662, 1651089
VEHICLE SPEED CONTROL Unique Reports describe unintended acceleration when the brake pedal was depressed, resulting in a collision, as well as a non-specific battery-related issue. 1397226, 1505661, 1547974
WHEELS Unique Difficulty sourcing correct tire size, leading to availability issues and higher costs. 1404267
The following section consolidates the analysis for the remaining Scion models with fewer incident reports.
4.0 Scion iC, iM, iQ, and Generic SCION: Incident Analysis
This section consolidates the analysis for models with a lower volume of reported incidents. Each model is assessed individually to identify any specific points of failure based on the available complaint narratives.
4.1 Scion iC
A single incident was reported for the Scion iC. Filed under UNKNOWN OR OTHER, the complaint (ID 1421890) describes the tempered glass sunroof spontaneously shattering into small pieces while the vehicle was being driven on the road.
4.2 Scion iM
The Scion iM presents a small number of emerging and low-frequency issues.
The remaining unique incidents for the Scion iM include:
4.3 Scion iQ
The Scion iQ reports cluster around a few key systems with low-frequency issues.
Unique incidents for the Scion iQ are summarized below:
4.4 Generic SCION
Two unique incidents were filed under the general SCION category:
This report will now transition to a detailed analysis of the high-volume Scion tC model.
5.0 Scion tC: Incident Analysis
The Scion tC exhibits the highest volume and frequency of complaints in this dataset. Multiple critical systems are rated "High" for widespread issues, indicating significant areas for engineering investigation. The data points to systemic failures in safety equipment, structural components, and primary vehicle control systems.
5.1 High-Frequency Issues
AIR BAGS (Widespread Level: High)
A high number of complaints describe airbag non-deployment in moderate to severe frontal collisions. In numerous reported incidents, vehicles sustained significant front-end damage at speeds over 30 MPH without any airbag activation, raising serious questions about sensor calibration and system reliability. Other reports detail spontaneous deployment of side curtain airbags after a passenger simply closed the door.
ELECTRICAL SYSTEM (Widespread Level: High)
Electrical system complaints point to severe failures, including spontaneous fires. One report describes a vehicle catching fire shortly after being parked, while another notes the rubber hatch release melting and dripping onto the rear bumper. A recurring issue is the failure of the charcoal canister assembly, identified by multiple diagnostic trouble codes (P043E, P2401, etc.), which is an expensive component to replace.
ENGINE (Widespread Level: High)
Engine complaints are dominated by reports of catastrophic failure due to excessive oil consumption. Owners describe engines burning through a quart of oil every 700-1200 miles, well outside normal parameters. This condition, often linked to defective piston rings, leads to oil starvation and complete engine seizure, frequently occurring without warning while the vehicle is in motion.
POWER TRAIN (Widespread Level: High)
Power train failures include sudden acceleration in reverse, gear slippage, and premature clutch failure. Several complaints detail issues with the transmission, including bucking at low speeds, hesitation to shift, and the shifter becoming stuck in park. These issues contribute to unpredictable vehicle behavior and potential loss of control.
SERVICE BRAKES (Widespread Level: High)
Service brake complaints describe total brake failure, loss of hydraulic pressure, and lock-ups. One report details a brake failure that led to an accident in which the airbags also failed to deploy. Another describes a "pop" under the front of the car, followed by the steering locking to the left, resulting in a loss of control.
STEERING (Widespread Level: High)
Reports related to steering are particularly alarming, describing sudden and complete loss of control at highway speeds. Narratives detail the steering wheel pulling hard to one side, locking up, or becoming completely free-spinning, making the vehicle unresponsive. These life-threatening events suggest a critical failure in the steering linkage or power assist system.
STRUCTURE / STRUCTURE:BODY (Widespread Level: High)
Structural complaints are dominated by the widespread failure of the rear hatch handle. In numerous reports, the entire plastic assembly breaks away from the vehicle during normal use, leaving it dangling by its electrical wires. This appears to be a systemic design or material flaw.
UNKNOWN OR OTHER (Widespread Level: High)
This category includes a high volume of complaints that often relate to other high-frequency issues, such as poor paint quality (chipping, flaking) and failures of the sunroof deflector. The sheer number of varied complaints underscores a potential for broad quality control issues with this model.
VEHICLE SPEED CONTROL (Widespread Level: High)
Numerous reports describe unintended and sudden acceleration. Complaints detail stuck accelerator pedals and incidents where the vehicle lunged forward or accelerated without driver input, often while braking. These events represent a severe and direct threat to driver, passenger, and public safety.
VISIBILITY:SUN/MOON ROOF ASSEMBLY (Widespread Level: High)
An exceptionally high number of reports document the sunroof glass spontaneously shattering or exploding while driving. This failure occurs without any apparent impact, often at highway speeds, startling the driver and showering the cabin with glass, creating a significant distraction and injury hazard.
5.2 Medium and Lower-Frequency Issues
Several other systems show a medium frequency of complaints. AIR BAGS:FRONTAL issues echo the broader airbag non-deployment theme. ENGINE AND ENGINE COOLING complaints often relate to head gasket leaks and cracked engine covers. EXTERIOR LIGHTING reports frequently mention the unusual design choice of having only one reverse light, while LATCHES/LOCKS/LINKAGES complaints reinforce the high-frequency issue of the rear hatch handle breaking. SEAT BELTS reports are severe, describing failures to lock during rollover accidents, resulting in occupant ejection and, in some cases, fatalities.
The remaining low, emerging, and unique incidents are documented in the table below.
System Widespread Level Summary of Complaint Identifying IDs
POWER TRAIN:AUTOMATIC TRANSMISSION Low Reports of vehicle shaking, hesitation to shift, and surging forward from a stop. 530855, 533494, 566846, 704210, 779533
TIRES High Numerous complaints of premature wear, sidewall cracks, and tread separation. 541144, 609978, 635492, ... (and 17 more)
VISIBILITY/WIPER Medium A high number of reports describe the sunroof spontaneously shattering. 932597, 966022, 986314, ... (and 15 more)
WHEELS Medium Reports include cracked rims, excessive snow/ice buildup, and loss of control. 639820, 796676, 838745, ... (and 9 more)
ELECTRONIC STABILITY CONTROL (ESC) Low Complaints of hesitant braking and constant illumination of stability control lights. 908193, 962025, 1153336, 1253526, 1312913, 1345919
EQUIPMENT Low Issues include paint peeling/chipping, rattling stereo cover, and power window failure. 533493, 540589, 585626, 669448, 682638, 713269, 714788, 735893, 769791, 916156
FUEL SYSTEM, GASOLINE Low Reports of a stuck throttle body and charcoal canister failure. 690285, 704209, 878167, 884004, 912817, 1078727
FUEL/PROPULSION SYSTEM Low Reports of severe oil consumption and vapor emissions canister issues. 943296, 958930, 959448, 1200735, 1238626, 1275569, 1290627, 1481569, 1551968
STRUCTURE:BODY:HATCHBACK/LIFTGATE Low Complaints of hatch rattling, failing to stay open, and handle breaking off. 545708, 586189, 604813, 851913, 902206, 924003, 1121970
STRUCTURE:BODY:ROOF AND PILLARS Low Sunroof spontaneously shattering while vehicle was motionless or driving. 554449, 560066, 597243, 684431, 734372
STRUCTURE:BODY:TRUNK LID Low Trunk hatch handle snapping off during normal use. 804821, 905173, 930114, 977201, 977295, 1143053
STRUCTURE:FRAME AND MEMBERS Low Reports of severe frame rust, corrosion, and cracks. 667508, 727894, 769792, 794671, 797259, 824278, 1464536
SUSPENSION Low A popping sound from the front of the car followed by loss of steering control. 592108, 843894, 924036, 1244869, 1253528, 1516830, 1526872, 1659970, 1756678
VISIBILITY:WINDSHIELD Low Windshield shattering from small pebble impact or cracking spontaneously. 533833, 564805, 635493, 964408, 1135869
ENGINE AND ENGINE COOLING:ENGINE Emerging Reports of violent cold start jerking, electrical smoke from under the hood, and engine stalling. 606793, 702662, 789900, 789945
SEAT BELTS:FRONT Emerging Driver's seat belt shredded in a collision, causing occupant ejection. 547922, 660864
SEATS Emerging Driver's seat moved forward on its own while coming to a stop. 706958, 764708, 1201580
TRACTION CONTROL SYSTEM Emerging Reports of brakes locking up and loss of traction. 766204, 916155, 1345918
VEHICLE SPEED CONTROL:ACCELERATOR PEDAL Emerging Accelerator pedal stuck. 770229, 772169, 960757
WHEELS:LUGS/NUTS/BOLTS/STUDDS Emerging Vehicle fishtailed while braking on an exit ramp and hit a guardrail. 585081
AIR BAGS:FRONTAL:SENSOR/CONTROL MODULE Unique Airbags did not deploy in a collision with a semi-truck. 660862
AIR BAGS:SIDE/WINDOW Unique Driver-side curtain airbag deployed spontaneously while driving. 660863, 704207, 804453, 884499
ELECTRICAL SYSTEM:WIRING Unique Complaints about the wire harness system. 616118, 1430458
POWER TRAIN:MANUAL TRANSMISSION Unique Complaints of premature clutch failure and the vehicle popping out of gear. 609976, 683351, 749081, 765948
STEERING:LINKAGES:TIE ROD ASSEMBLY Unique Vehicle violently swerved left, hitting a center divider. 643702
The next section proceeds with the analysis of the Scion xA model.
6.0 Scion xA: Incident Analysis
This section reviews reported issues for the Scion xA, which shows a notable concentration of "High" and "Medium" frequency complaints related to its airbag and electrical systems. These patterns suggest potential weaknesses in core safety and operational components.
6.1 High and Medium-Frequency Issues
AIR BAGS (Widespread Level: High)
The Scion xA has a high rate of complaints related to airbag system failures. The dominant themes are non-deployment of airbags during significant collisions and persistent illumination of the airbag warning light on the dashboard. In multiple crashes described, including one where the entire front end was damaged at 45 MPH, the airbags failed to deploy, compromising occupant safety.
ELECTRICAL SYSTEM (Widespread Level: Medium)
Electrical system failures reported for the xA often lead to dangerous vehicle behavior. One complaint describes the vehicle suddenly decelerating from 60 MPH to 20 MPH, requiring a restart to restore function. Other reports detail failures of the electrical cable in the steering column (causing the airbag light to illuminate) and master power window switch failures.
FUEL SYSTEM, GASOLINE (Widespread Level: Medium)
Complaints related to the fuel system frequently point to a recurring failure of the charcoal canister assembly. Water intrusion into the canister appears to be a common issue, leading to illuminated check engine lights and costly, repeated repairs. This suggests a potential design flaw in the placement or sealing of this emissions component.
VEHICLE SPEED CONTROL (Widespread Level: Medium)
The Scion xA has a significant number of reports describing sudden, unintended acceleration. These incidents often occur at low speeds, such as during parking maneuvers, where the vehicle aggressively accelerates despite brake application, leading to collisions with stationary objects. One report also details a stuck cruise control system on the highway.
6.2 Lower-Frequency Issues
Reports for other systems occurred at a lower frequency. ENGINE complaints center on check engine light illumination due to emissions system problems and at least one report of an engine fire. SEAT BELTS issues are severe, including a failure to restrain the driver in a crash, leading to severe brain trauma. LATCHES/LOCKS/LINKAGES complaints describe the failure of the latch that holds the rear seat in its upright position.
The remaining unique incidents for the xA are documented below.
System Reported Widespread Level Complaint Summary Identifying ID
ELECTRICAL SYSTEM:IGNITION:MODULE Unique Prolonged cranking issue with the starter that the dealer would not fix. 567035
ELECTRONIC STABILITY CONTROL (ESC) Unique Engine is suddenly jolty, check engine light flashes, but diagnostics read "Error". 1540886
ENGINE AND ENGINE COOLING Unique Check engine light due to defective charcoal canister; burning smell from vehicle. 740182, 813024, 887513, 916640
EQUIPMENT Unique Reports of unintended acceleration and leaking A/C. 656811, 713894
EXTERIOR LIGHTING Unique Complaints of repeated headlight failure and a leaking tweeter/mirror combination. 573406, 654713, 724030
FUEL SYSTEM, OTHER Unique Unintended acceleration while parking, leading to a collision with a wall. 724004, 820308
FUEL/PROPULSION SYSTEM Unique Reports of a ruptured fuel line and recurring charcoal filter failures. 929645, 1253106, 1264328, 1358819
POWER TRAIN Unique Complaints of check engine light illumination and misdiagnosed clicking noise. 1408852, 1567422
SEATS Unique Latch holding the rear seat in position failed. 697674
SERVICE BRAKES Unique Brakes applied, car violently jerked to the left into oncoming traffic. 2029363
STEERING Unique Repeated failure of wheel shaft bearings; electrical cable failure in steering column. 724005, 1082648, 1178837
STRUCTURE Unique Poor headlight design causes blinding effect in fog. 612802
SUSPENSION Unique Repeated failure of left and right side wheel shaft bearings. 1082649
VISIBILITY:POWER WINDOW DEVICES AND CONTROLS Unique Power window master switch failed; power windows are defective and break easily. 532129, 943707, 995417
VISIBILITY:SUN/MOON ROOF ASSEMBLY Unique Entire sunroof exploded while driving at 60 MPH. 1301718
WHEELS:RIM Unique Enkei wheel rim bent without an accident, requiring replacement. 547075
The analysis now turns to the Scion xB model.
7.0 Scion xB: Incident Analysis
Similar to the Scion tC, the xB model presents a high volume of complaints across critical safety systems. This analysis highlights widespread issues concerning airbags, electronic stability control, engine performance, steering, and structural integrity, suggesting potential systemic vulnerabilities in this model.
7.1 High-Frequency Issues
AIR BAGS (Widespread Level: High)
A high frequency of complaints describes airbag non-deployment in frontal collisions. In several reported incidents, vehicles sustained significant front-end damage, including smashed sensors, without any airbag activation. This recurring failure pattern raises serious concerns about the reliability of the supplemental restraint system.
ELECTRICAL SYSTEM (Widespread Level: High)
Electrical system failures reported for the xB are severe, including multiple instances of vehicle fires. One report describes a dashboard electrical unit catching fire while the car was parked, engulfing the vehicle in flames within minutes. Other complaints detail intermittent dimming of headlights and simultaneous illumination of multiple console warning lights.
ELECTRONIC STABILITY CONTROL (ESC) (Widespread Level: High)
There is a high frequency of complaints related to the failure of the ESC system. The most common report is the simultaneous illumination of the VSC (Vehicle Stability Control), Traction Control, and ABS warning lights. This failure is often attributed to faulty or corroded wheel speed sensors and wires, particularly in colder climates with road salt, rendering these critical safety systems inoperative.
ENGINE (Widespread Level: High)
Engine complaints are overwhelmingly focused on severe and excessive oil consumption. Numerous owners report their vehicles burning through a quart of oil every few hundred miles. This condition leads to oil starvation, which can cause sudden engine shutdown and catastrophic failure, often without any prior warning from dashboard indicators.
SERVICE BRAKES / SERVICE BRAKES, HYDRAULIC (Widespread Level: High)
Brake system complaints are frequent and severe. Reports detail malfunctioning wheel speed sensors causing ABS and VSC system failure. In cold weather, parking brake cables are reported to freeze, causing the rear calipers to lock against the rotors. A detached brake pedal was also reported.
STEERING (Widespread Level: High)
Steering system failures are a critical safety concern for the xB. Numerous reports describe a sudden and complete loss of the electronic power steering assist while driving. This failure makes the steering wheel extremely rigid and difficult to turn, requiring immense physical effort to control the vehicle and creating a significant risk of an accident.
STRUCTURE:BODY (Widespread Level: High)
Structural complaints are concentrated in two areas. First, similar to the Scion tC, there are repeated failures of the rear hatch handle breaking off during normal use. Second, there is an unusually high number of reports describing spontaneous windshield cracks, often appearing in an "L" shape without any sign of impact, suggesting a stress or design flaw.
UNKNOWN OR OTHER (Widespread Level: High)
The high volume of complaints in this category often overlaps with other identified issues, such as windshield cracking and hatch handle failures. The breadth of issues reported here, from seat belt malfunctions to brake failures, points to potential widespread quality control deficiencies for this model.
VEHICLE SPEED CONTROL (Widespread Level: High)
Reports of sudden, unintended acceleration are a high-frequency complaint for the xB. Drivers describe incidents where the engine revved and the vehicle lunged forward, often at low speeds or while braking, resulting in collisions. Multiple complaints also mention the accelerator pedal getting stuck.
VISIBILITY:WINDSHIELD (Widespread Level: High)
Mirroring the complaints in the "Structure:Body" category, there is a very high number of reports specifically detailing spontaneous windshield cracking. This failure typically occurs without any impact from road debris, often while the car is parked, suggesting a potential flaw in the glass manufacturing or vehicle frame design causing excessive stress on the windshield.
7.2 Lower-Frequency Issues
Issues with a medium, low, or emerging frequency further highlight systemic problems. LATCHES/LOCKS/LINKAGES (Medium) and SEAT BELTS (Medium) complaints are common, with reports of doors failing to unlock from the inside, trapping occupants, and seat belts failing to restrain children properly. POWER TRAIN (Medium) complaints include unintended acceleration and sudden, hard jerking between gears. STRUCTURE (Medium) and WHEELS (Medium) also exhibit a significant number of reports related to hatch handle failures and premature tire wear/warped rims, respectively.
The remaining unique incidents are documented in the table below.
System Widespread Level Summary of Complaint Identifying ID
AIR BAGS:FRONTAL:SENSOR/CONTROL MODULE Unique Passenger airbag deployed in a collision with no passenger present. 598997
BACK OVER PREVENTION: REARVIEW SYSTEM BRAKING Unique Complaint regarding the vehicle belonging to a sex trafficker. 2056573
ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL Unique Multiple warning lights illuminated; speedometer failure; instrument panel failed to illuminate. 640435, 660119, 783895, 828173
ELECTRICAL SYSTEM:IGNITION:SWITCH Unique Ignition switch loosened to the point the key could be removed while the engine was running. 1061851
ELECTRICAL SYSTEM:WIRING Unique Warning lights illuminated, with cause traced to wheel speed sensor wiring. 751401
ELECTRICAL SYSTEM:WIRING:INTERIOR/UNDER DASH Unique Fuse box wire became hot, creating a potential fire hazard. 1555755
ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC) Unique VSC, Traction Control, and Check Engine lights remained illuminated. 640433
ENGINE AND ENGINE COOLING:ENGINE:GASOLINE Unique Vehicle bucks and jerks violently when the engine is cold. 573354
ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION: OIL COOLER Unique Complaint of excessive engine oil consumption. 1810942
EQUIPMENT ADAPTIVE/MOBILITY Unique Reports of accelerator pedal sticking on floor mat and random security system activation. 745788, 764646, 1030812, 1055358
EQUIPMENT:APPLIANCE:AIR CONDITIONER Unique A/C condenser punctured by a small rock due to grill design. 594464
EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM) Unique Complaint mentions several close calls but provides no specific failure details. 1947402
EXTERIOR LIGHTING:HEADLIGHTS Unique Low beams noted as having insufficient projection distance. 559322, 637368, 653660
FUEL SYSTEM, OTHER Unique Gas pedal stuck during acceleration. 762694
FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM Unique Lack of power and acceleration until reaching 4000 RPM. 598466
LATCHES/LOCKS/LINKAGES:HATCHBACK/LIFTGATE:LOCK Unique Rear hatch garnish latching attachment fractured, creating sharp edges. 1074362
LATCHES/LOCKS/LINKAGES:HOOD:LATCH Unique Hood latch failed while driving at 60 MPH. 1414631
PARKING BRAKE Unique Reports of parking brake freezing in cold weather and failing on an incline. 751018, 876206
POWER TRAIN:CLUTCH ASSEMBLY Unique Clutch failed while driving at 70 MPH. 756889
POWER TRAIN:DRIVELINE:CONSTANT VELOCITY JOINT Unique Front passenger tire experienced tread separation. 804018
POWER TRAIN:MANUAL TRANSMISSION Unique Complaints of premature clutch wear-out at low mileage. 744966, 760506
SEAT BELTS:FRONT:RETRACTOR Unique Passenger seat belt retractor limit is too short for the vehicle configuration. 556076
SEATS:FRONT ASSEMBLY:HEAD RESTRAINT Unique Factory-installed headrest monitors failed. 687185
SERVICE BRAKES, AIR Unique Momentary loss of braking capability over uneven road surfaces. 760150
SERVICE BRAKES, ELECTRIC Unique Brake warning lights illuminated intermittently; ABS failure traced to wheel speed sensors. 759724, 762954, 841223, 847878
SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP Unique Delayed brake response after releasing pedal, resulting in low-speed collision. 599861, 774446, 1073589
STEERING:COLUMN Unique Steering column froze while making a turn. 586779
STRUCTURE:BODY:TAILGATE Unique Complaint of premature tire wear and warped rims. 904674
STRUCTURE:FRAME AND MEMBERS Unique Reports of a cracked weld/frame and bumper lip falling off. 678363, 678670, 860473
VEHICLE SPEED CONTROL:ACCELERATOR PEDAL Unique Accelerator pedal stuck to the floor. 674781
VEHICLE SPEED CONTROL:CRUISE CONTROL Unique Cruise control does not respond to the on/off reset button. 653661, 830758
VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM Unique Heater blew cold air, followed by a grey cloud from the vehicle. 1164494
VISIBILITY:REAR WINDOW WIPER/WASHER Unique Complaint regarding ongoing windshield cracking. 758105
WHEELS:RIM Unique Tire placard information was incorrect for proper inflation. 771112
The report now proceeds to the final model analysis for the Scion xD.
8.0 Scion xD: Incident Analysis
This section reviews the Scion xD, a model distinguished by a high frequency of service brake complaints. Additionally, several medium-frequency issues related to the electrical system and suspension point to other areas of potential concern.
8.1 High-Frequency Issue: Service Brakes
SERVICE BRAKES (Widespread Level: High)
The service brake system is the most frequently cited area of failure for the Scion xD. Analysis of complaints reveals recurring issues with the Anti-lock Braking System (ABS). A common pattern involves the illumination of the ABS and brake warning lights, indicating a system failure. Many owners report that this issue is traced to faulty or corroded rear wheel speed sensors and wiring, a problem that appears to be exacerbated by cold climates and exposure to road salt.
The safety risk posed by these failures is significant. Narratives describe a loss of ABS functionality, leading to increased sliding on slippery surfaces and, in some cases, a loss of braking power that resulted in collisions. The high frequency of these reports suggests a potential vulnerability in the wheel speed sensor design or its protection from environmental elements.
8.2 Medium-Frequency Issues
ELECTRICAL SYSTEM (Widespread Level: Medium)
Electrical system complaints frequently describe malfunctions with power locks and the master window switch. Multiple owners reported that power door locks failed one by one, requiring repair. A more severe issue involves the master window control panel on the driver's side, with reports of smoke coming from the switch, indicating a potential fire hazard.
SUSPENSION (Widespread Level: Medium)
Suspension issues are characterized by clunking noises from the front of the vehicle, especially when braking or driving over uneven surfaces. These complaints are often traced to a rusted or failed #2 sub-frame bolt. The corrosion and subsequent failure of this critical structural component could compromise the integrity of the front suspension and steering control.
8.3 Lower-Frequency and Unique Incidents
Lower-frequency issues include reports of airbags failing to deploy in a rollover accident and excessive engine oil consumption. Vehicle speed control complaints describe incidents of unintended acceleration and surging.
The table below documents all unique incidents for the Scion xD.
System Reported Widespread Level Summary of Complaint Identifying ID
ENGINE AND ENGINE COOLING Unique Complaints of vehicle oil and oil filter issues. 915726, 990349
EQUIPMENT:APPLIANCE:AIR CONDITIONER Unique Repetitive problem with mold and AC leaks causing health concerns. 1775491
EXTERIOR LIGHTING Unique Reports of tail lights failing due to a blown fuse and a fire at the rear of the vehicle. 798037, 1141822
FUEL SYSTEM, GASOLINE Unique Vehicle stalled on freeway; ABS engaged during a sudden stop. 915725, 1031220
FUEL SYSTEM, OTHER Unique Vehicle stalled after exiting the freeway. 793730
LATCHES/LOCKS/LINKAGES Unique Power locks started malfunctioning one by one. 1066238
PARKING BRAKE Unique Brakes get stuck/frozen when temperatures are below 23 degrees Fahrenheit. 766881, 840312
POWER TRAIN Unique Manual transmission and clutch failed, locking up the vehicle at an intersection. 1019399, 1083911, 1111521, 1247337
SEAT BELTS Unique Complaints of ABS light illumination and rear seat belt receptacle getting stuck under the seat. 779750, 835575, 1363400, 1737168
STEERING Unique Reports include stiff steering and a sub-frame bolt that rusted and snapped off. 763980, 975236, 977885, 1647144
STRUCTURE:BODY Unique Disparate issues reported, including unintended backward surge, a Takata recall letter, and mold/AC leaks. 971241, 1495733, 1775490
STRUCTURE:FRAME AND MEMBERS:UNDERBODY SHIELDS Unique #2 sub-frame bolt rusted through and the head fell out. 886543
TIRES Unique Complaints of tire pressure light illuminating followed by a flat tire and slow air leaks. 756031, 844387, 1132031, 1366556
TRACTION CONTROL SYSTEM Unique TCS light illuminated during inclement weather. 898906
UNKNOWN OR OTHER Unique A recall fix for a window lubricant (fire risk) had not been issued after two years. 1421806, 1675970
VISIBILITY Unique Smoke came out of power window master switch controls. 1141636
VISIBILITY/WIPER Unique Complaints of vehicle stalling and intermittent window function. 1293131, 1316926, 1435938
VISIBILITY:POWER WINDOW DEVICES AND CONTROLS Unique Driver side power window failed to close; smoke came from master control panel. 1091739, 1145686
WHEELS Unique "Mushy" brakes caused vehicle to go into an intersection; other complaints of suspension issues. 849430, 1278374, 1406432
9.0 Cross-Model Trend Synopsis
This comprehensive analysis of customer complaints across the Scion lineup reveals several critical, recurring failure patterns that transcend individual models. These trends point toward potential systemic issues in design, manufacturing, or component selection that warrant further investigation.
These cross-model trends strongly indicate that the reported incidents are not merely isolated events but may be symptoms of deeper engineering or quality control issues. A thorough engineering investigation and comprehensive safety assessment are recommended to address these potential systemic risks.