24KWL/PBL
Service Bulletin/Repair Instructions
The verbiage in the Introduction section has been updated.
Vehicle report
2021 PETERBILT 579
Service bulletins
96 bulletinsTechnical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
43-088
Service Bulletin/Repair Instructions
The procedure has been updated to include additional steps for verifying the software level on the vehicle electronic control unit (VECU2) and digital display (DD). Steps have also been added to the PACCAR Common Rail Injection 2 (PCI2) software verification.
E316
Service Bulletin/Repair Instructions
235 chassis have been removed from the chassis list and unflagged in PRWS due to expiration of applicable warranty coverage. 5 chassis have been added to the chassis list. The total chassis population is now 15,637.
41-029
Service Bulletin/Repair Instructions
Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson air filter housings.
CE030
Warranty Program/Extension
KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to this warranty policy.
43-080
Service Bulletin/Repair Instructions
KW: A new recommended repair has been added to verify the software level and close the campaign in SIR.The repair procedure has been updated with additional note boxes for clear instructions. PB: The repair procedure has been updated with additional note boxes for clear instructions.
R2103
Service Bulletin/Repair Instructions
Updated the point of contact for sourcing the MX Engine Overlay Harness Kits. This retrofit should have been completed by 5/15/2022 per the Action section of the bulletin. However, trucks still open in SIR are still eligible for the repairs.
02-177
Service Bulletin/Repair Instructions
Troubleshooting procedures for 2.1m cab power windows are now available.
43-087
Service Bulletin/Repair Instructions
(KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
41-024
Service Bulletin/Repair Instructions
Procedures have been updated to include additional truck models in the service intervals table.
42-064
Service Bulletin/Repair Instructions
Fix-as-Fail On certain Kenworth T680 chassis equipped with PACCAR MX-13 engines, wiring to the Horton LCX230 crank-mounted fan drive may experience a short due to chafing or water ingress, affecting fan drive operation.
45-070
Service Bulletin/Repair Instructions
The attached procedures document has been updated with more detail and explanations. This is not a stand-alone procedure. Cummins Quickserve troubleshooting will specify the use of these procedures while troubleshooting specific fault codes.
14-034
Service Bulletin/Repair Instructions
Bogie Crossmember Torque Value Update - Procedure has been updated to correct torque values.
E326
Emissions
EPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX engines.
01-090
Service Bulletin/Repair Instructions
Bulletin Update 03/02/2026 - A Meritor OnTrac case submission is required prior to repairs being completed. Failure to do so may result in warranty claim denial. See the procedure section for more details.
E335
Emissions
Expiration Date Format Update - Certain EPA21 compliant PACCAR MX-13 engines were built with intake valve springs that could fail. This failure can cause significant damage to the engine. New intake valve springs will be installed.
14-036
Other
One-Piece Aluminum Crossmember Repair - Repair procedures are available to support the replacement of intermediate or midship one-piece aluminum crossmembers.
24PBE_KWE
Service Bulletin/Repair Instructions
The Parts section has been updated to clarify that freight charges for safety recall orders should not be passed on to the end customer.
24PBE
Service Campaign
The right-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector. Loss of communication between the right-hand shift stalk and the vehicle may result in the vehicle being disabled after it comes to a stop, thereby increasing the risk of crash or injury. A warning will appear on the dash display when communication is lost, including transmission or engine warnings, “!” next to DNR/DNRP indicator, “-“ in the DNR/DNRP indicator, and/or chimes, depending upon whether you are operating a diesel/gas or battery electric vehicle.
46-019
Service Bulletin/Repair Instructions
Repair procedures and warranty information for model 520EV are now available. Certain Peterbilt 579EV and 520EV chassis have the First Responder Guide (FRG) label incorrectly showing the cut loop on the wrong side and are missing the Low Voltage Battery Disconnect Switch and Do Not Jump Start labels. These labels are now available for installation.
E311
Other
Condition, Chassis Affected, and Warranty sections updated with the following verbiage “E311 must be flagged and open in Service Information Record (SIR) at the time of RO open date to qualify.” Also, “Through Standard Warranty or any applicable active Extended Warranty” verbiage was removed from Warranty section.
E318
Service Bulletin/Repair Instructions
Newly designed fuel injectors are available for EPA2021 compliant PACCAR MX-series engines to optimize engine performance. Injectors must be replaced as a full set (6 injectors) and associated software must be updated at the same time.
98-030
Service Bulletin/Repair Instructions
5/29/2025: A new Ethernet Multiplexed Architecture (EMUX) Service Tool Kit service manual (SM034-022) has been released to provide general use information. The new EMUX Service Tool Kit improves cab & chassis electrical troubleshooting efficiency, while reducing risk of component damage. 4/29/2025: The Ethernet Multiplexed Architecture (EMUX) Service Tool Kit and individual kit components are now available to order. Dealers that have received their first kit may order an additional kit. The EMUX Service Tool Kit Part number has been updated to match OEM drawings (P74-1045-001). Individual kit component part numbers can be found in the Reference Bill of Materials sheet. The new EMUX Service Tool Kit improves cab & chassis electrical troubleshooting efficiency, while reducing risk of component damage. Information Only New diagnostic tool is required to support PACCAR Ethernet Multiplexed Architecture (EMUX). The EMUX Service Tool Kit will help improve cab & chassis electrical troubleshooting efficiency, while reducing the risk of component damage.
T016 / 26-040
Service Bulletin/Repair Instructions
T016: Warranty section updated to include 0.5 hours for test drive. Recommended Repair T016C has been updated from 6.4 hours to 6.9 hours. SRT codes updated in PRWS Claim Coding Table: B25-17A for 6.9 hours created to replace all other codes. 26-040: Warranty section updated to include 0.5 hours for test drive. Recommended Repair 26040C has been updated from 6.4 hours to 6.9 hours. SRT codes updated in PRWS Claim Coding Table: B25-17A for 6.9 hours created to replace all other codes.
46-016
Service Campaign
4/29/2025: Campaign A software update is available for 520EV and 579EV Battery Electric Vehicles. This software update corrects or improves certain functions. Software update procedures have been revised. Campaign start date is 12/05/2024. Campaign A software update is available for 520EV and 579EV Battery Electric Vehicles. This software update corrects or improves certain functions. Campaign start date is 12/05/2024.
E327
Emissions
Vehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash STOP lamp incorrectly. PCI-2 software on these chassis must be reverted from NA202 to NA201 (Pack 2 injectors) or from NA206 to NA191 (Pack 1 injectors) to prevent incorrect STOP lamp display. 11014768 20250304 E327 20250227 E327 Emissions PETERBILT 579 2021 ENGINE Vehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash STOP lamp incorrectly. PCI-2 software on these chassis must be reverted from NA202 to NA201 (Pack 2 injectors) or from NA206 to NA191 (Pack 1 injectors) to prevent incorrect STOP lamp display.
46-013
Service Campaign
Certain Peterbilt 579EV and 520EV Battery Electric Vehicles were built prior to the availability of certain labels and Low Voltage Distribution System (LVDS) Components. Affected chassis will be inspected and necessary components will be installed.
24PBL
Service Bulletin/Repair Instructions
Safety Recall Updated software and procedures are now available. Certain Vehicle Model Year 2021-2025 Peterbilt chassis configured for trailer towing require a software update for the Bendix EC80 ABS ECU. Software update procedures for certain Battery-Electric Vehicles (BEV) and EC80 ABS ECU part numbers are not yet available. This bulletin will be updated when software update procedures are available for these chassis. Safety Recall publish date: 1/10/25
46-011
Service Bulletin/Repair Instructions
Some 579EV and 520EV BEV trucks may have loose or improperly torqued ESS gland nuts. This may cause an intermittent warning light on the dash display.
32-025
Service Bulletin/Repair Instructions
Info Only Unnecessary starter replacements can result from customer complaints regarding engine starting issues. A new Starter Troubleshooting Guide has been created to provide a comprehensive list of starting system checks, which should reduce unnecessary starter replacements and associated warranty claims. Engine starting system warranty claims now require a completed Starter Checklist, a Battery Pack Midtronics Report, and a Cable Drop Midtronics Report. Claims filed without these documents may be denied.
7-700
Warranty Program/Extension
7/700 Service Agreement - Letter Only.
E290
Service Bulletin/Repair Instructions
FIX-AS-FAIL Updated to include EPA2024 compliant engines. Fuel Filters must be changed before first cleaning. EPA2021 injector cleaning is referenced in RMI for certain injector faults. Complete the procedures in E290. Discard any previous versions of E290 procedures – always use the most current document from the link in the bulletin.
46-014
Service Bulletin/Repair Instructions
Information Only Storage guideline procedures are now available for both Medium Duty and Heavy-Duty Battery Electric Vehicles.
46-001 HVAC Update
Other
BEV Phase 2 tools have been added to the BEV required tools lists.
16-044
Service Bulletin/Repair Instructions
Fix As Fail The height control valve (HCV) rod on vehicles with low air leaf suspensions is prone to toggling over center during rough road conditions. With full suspension articulation, HCV bracket flexes and toggles over center the HCV linkage, which results in either deflated airbags or makes them unable to inflate. Fix-as-fail start date is 07/30/2024.
36-191
Service Bulletin/Repair Instructions
Information Only Vehicles equipped with Digital Vision System (DVS) Mirror Mounted Cameras, that do not have optional left-hand or right-hand blind spotters, may set false Diagnostic Trouble Codes (DTC) 522490-9 or 522491-9. These DTCs can be ignored if corresponding blind spotter is not equipped. The next Digital Vision System Mirrors (DVS-M) software update will correct these false DTCs.
34-095
Service Bulletin/Repair Instructions
Fix As Fail â Dimensions and instructions are available for trimming the radiator recirculation shields to alleviate possible rub to the hood harness. (ARC 1/22/24)
23PBH
Service Bulletin/Repair Instructions
Safety Recall Parts are now available to remedy this issue. Certain model year 2021 to 2024, 567 and 579 vehicles built from 06/22/2020 through 06/16/2023 were equipped with air tank bracket G11-6439-009mounted behind a fuel tank without a frame spacer. The air tank mounting U-bolt tips may be different lengths and could contact the fuel tank, which can result in a hole and the potential for a fuel leak. Leaking fuel may lead to an increased risk of a fire.
E273
Service Bulletin/Repair Instructions
Fix As Fail Updated: Two part numbers added: 1818119 DPF Delta Pressure Sensors for MX-13-2 EMY18 2200138 DPF Delta Pressure Sensors for MX-13 -2, EMY19 Per Environment and Climate Change Canada (ECCC) regulations and guidance (Canadian Environmental Protection Act, 1999 (CEPA)), a letter has been provided to owners of Canadian registered chassis that provides a list of emissions components that have been reported (to ECCC) as having a defect.
E306
Service Bulletin/Repair Instructions
Incorrect fuel filter drain and replacement procedures on EPA21 MX-11 and MX-13 engines can result in the following: .Debris and contaminants introduced into the high-pressure fuel system. .Denial of warranty claims for injector and/or fuel system faults. .Misfire, rough running, engine knock, and other associated faults and symptoms. Correct fuel filter procedures are outlined in attached service documentation.
45-066
Service Bulletin/Repair Instructions
A testing procedure has been created for the coolant level sensor on model 520.
45-065
Service Bulletin/Repair Instructions
Certain 579 MLU chassis equipped with Cummins X15 engines have fan hub bracket hardware that are incorrect for the application and/or under torqued and could become loose and/or fail. Procedures are available to replace and properly torque the hardware.
E292 PB
Service Bulletin/Repair Instructions
Campaign Certain EPA2021 chassis equipped with PACCAR MX engines have Selective Catalytic Reduction (SCR) Catalyst contamination that occurred during manufacturing. SCR Catalyst assemblies will be inspected and replaced as necessary.
28-001
Service Bulletin/Repair Instructions
For all Peterbilt chassis equipped with an air shifted PTO. Oil from the air shift cover of the PTO may leak into the air line, causing the EOA solenoid to become inoperative.
01-079
Service Bulletin/Repair Instructions
Fix-as-Fail - HVAC Intermittently Stops Blowing Cold Air
E283
Service Bulletin/Repair Instructions
UPDATE - 06-09-2023 - This Campaign is being extended to December 30, 2023.
E300
Service Bulletin/Repair Instructions
PACCAR will reimburse customers for the local purchase of in-tank fuel additive for EPA2021 compliant MX engines. This is a one-time reimbursement. Only customers who have received E290 injector cleaning qualify for this reimbursement. See bulletin for limits and purchase tracking requirements.
36-008
Service Bulletin/Repair Instructions
Certain 579 chassis are eligible to receive production level Digital Display software, Digital Display, Lane Keep Assist MUX switches, and Kick Panel.
02-178
Service Bulletin/Repair Instructions
Fix As Fail â Certain 579, and New Model 579 chassis that were manufactured with a Bendix forward looking camera system may experience bracket failure causing the bracket and camera to fall from the windshield.
34-096
Service Bulletin/Repair Instructions
Fix As Fail â All New Model 579 chassis with Bendix radar opti on may have a harness rub against the radiator that is causing possible damage.
02-176
Service Bulletin/Repair Instructions
Model 579 A-pillar fairing adhesive is not properly securing the fairing to the cab structure.
03-087(E295)
Service Bulletin/Repair Instructions
Certain Model Year 2021-2024 chassis with PACCAR MX engines and optional fuel filter restriction virtual gauge may display incorrect restriction levels. The virtual gauge will be temporarily disabled until are vised sensor strategy is developed.
E303
Service Bulletin/Repair Instructions
This campaign is the final opportunity to replace the oil filter screw cap to reduce occurrences of broken bypass valve tabs. Broken oil valve tabs can cause oil flow obstruction to critical engine parts, resulting in serious engine damage. Customers that do not receive this repair may be responsible for progressive engine damage caused by broken oil bypass valve tabs.
14-032
Service Bulletin/Repair Instructions
On some new model 579 chassis, the front frame tow pins do not fit (or require adjustment to fit in the front spring bracket.
21PBN
Service Bulletin/Repair Instructions
21PBN â LNG/CNG Methane Detecti on System Will Not Warn Operator if System Loses Power â NHTSA ID:21V00N, TC: 2021-793
45-064
Service Bulletin/Repair Instructions
Info Only - PACCAR is introducing Over-the-Air (OTA) software updates for engine MY17 and newer chassis equipped with Cummins X15, X12, ISX12, ISX12N, L9N, PX-7, and PX-9 engines The technology will leverage the existing Remote Diagnostic cs hardware to deliver secure software updates remotely. This will reduce downtime and save on maintenance costs for eligible vehicles.
14-043
Service Bulletin/Repair Instructions
Fix-As-Fail On certain chassis with Low Air Leaf Suspension or Low-Low Air Leaf Suspension, the Height Control Valve (HCV) arm may be rubbing on other components when the bend in the arm is facing outboard. Flipping the bend in the HCV arm inboard prevents the rub.
02-165
Service Bulletin/Repair Instructions
Fix-As-Fail: Forces being applied to the split fender and fairing structure are causing the connection to crack and potentially separate. Reinforcement brackets secure the connection and prevent separation.
13-060
Service Bulletin/Repair Instructions
The service information for Bendix Air Dryer maintenance is being updated to include new procedures.
E291
Service Bulletin/Repair Instructions
âNon-Safety Campaign â The PACCAR MX-13 J2 engine harness may not be properly secured, resulting in potential wear of the wiring harness.
02-169
Service Bulletin/Repair Instructions
Info Only - Chassis equipped with a flush mounted battery box between the frame rails, and containing 3 batteries, may experience battery movement on the side where the single battery resides. This bulletin contains a procedure to fabricate a bracket to hold this battery in place.
E294
Service Bulletin/Repair Instructions
Information Only - This bulletin is to provide information about the availability of a fuel filter set for Pre-Production or Validation level chassis. This fuel filter set is available directly from a PACCAR dealership parts department.
42-060
Service Bulletin/Repair Instructions
âFix-As-Fail â If a customer comes into your dealership and demonstrates the condition above, replace the fan clutch adapter harness with the improved harness and clear the DTCs.
04-019
Service Bulletin/Repair Instructions
A roof fairing reinforcement kit increases structural support for one-piece 579 roof fairings that are experiencing fatigue from external forces such as reverse towing.
E286
Service Bulletin/Repair Instructions
Fix-As-Requested - âââEngine Model Year 2021B and later PACCAR MX-11 & MX-13 Fuel Injector Adjustment During First C Service
TIB 98-020
Service Bulletin/Repair Instructions
Information Only â New Level 1 required tools are available to support MY21B MX engines.
13-057
Service Bulletin/Repair Instructions
Fix-As-Fail â A hill start assist (HSA) valve plumbing revision eliminates ice buildup in the HSA valve exhaust in cold weather.Â
34-090
Service Bulletin/Repair Instructions
A frame mounted left-hand marker light bracket interferes with the rear fuel tank fill location. A redesigned bracket can be purchased that relocates the marker bracket to the front fuel tank bracket to eliminate interference.
51-013
Service Bulletin/Repair Instructions
Due to major data carriers phasing out 3G networks, chassis currently utilizing first generation Peoplenet Mobile Gateway (PMG001) will experience severe 3G service degradation as early as January of 2022. Chassis currently utilizing 3G antennas as a primary antenna may experience this degradation.
22PBA
Service Bulletin/Repair Instructions
Safety Recall â Chassis Fairings with integrated cab step may become loose, allowing minor unintended movement and risk of injury while entering and exiting the cab. The repair procedure and parts information will be added when parts are available.
E282
Service Bulletin/Repair Instructions
Information Only: Due to differences between the PACCAR MX-11 or MX-13 2021A and 2021B engines, technicians must be able to identify which of these engines are in a chassis.
34-091
Service Bulletin/Repair Instructions
Non-Safety Campaign â An incorrectly set VECU software parameter is causing the running lamps to be inactive for certain, US registered, model year 2021 579 chassis. The parameter can be correctly set by reflashing the VECU  with updated software.
21PBM
Service Bulletin/Repair Instructions
âÂÂSafety Recall â Work Brake May Unintentionally Disengage â NHTSA ID: 21V906, TC: 2021-713. The work brake (also known as winch brake) may unintentionally disengage during winching operations, releasing the service brakes, increasing the risk of crash or injury. The VECU software will be updated to correctly set the speed interlock parameter.
26-038
Service Bulletin/Repair Instructions
Non-Safety Campaign:Â Eaton Endurant transmissions may experience premature Main Drive Gear damage due to clutch housing and main case countershaft bearing bore wear. A Clutch Housing Front Cover Kit will be installed to address the issue.
E280
Service Bulletin/Repair Instructions
Non-Safety Campaign: Certain DC tools were incorrectly calibrated. The resulting torque issue could affect the EPA21 MX-11 and MX-13 Oil Pan and/or the Exhaust Manifold.
T012
Service Bulletin/Repair Instructions
Non-Safety Campaign: âDrivers of vehicles equipped with PACCAR TX-12 transmissions may experience harsh shifts and gear grinding noise. Premature Main Drive Gear damage may occur due to clutch housing and main case countershaft bearing bore wear.
43-071
Service Bulletin/Repair Instructions
Fix-As-Fail â Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are available. As a temporary solution, after PACCAR confirms a DEF sensor is not available, a temporary software update will allow a vehicle to continue operation with a failed DEF sensor by disabling the DEF sensor diagnostics.
02-168
Service Bulletin/Repair Instructions
Information Only - Rear axle Quarter Fenders with less than two inches of clearance between the top of the quarter fender and the bottom of the trailer/equipment are susceptible to damage. The lack of clearance could result in cracked/broken quarter fenders or complete separation if undetected or un-remedied. â
21 PBJ
Service Bulletin/Repair Instructions
âSafety Recall â Hill Start Assist (HSA) Valve Clearance â NHTSA ID: 21V-648, TC: 2021-521. Crossmember mounted Hill Start Assist valve may not have sufficient clearance to the rear axle, resulting in hose or fitting damage. Damage could cause the loss of rear brake signal, resulting in reduced braking capability and increasing the risk of a crash.
43-069
Service Bulletin/Repair Instructions
A DPF regeneration two-position switch parameter is causing inhibited DPF regeneration. A parameter update, via Cummins Insite, restores proper DPF regeneration function.
21-PBF
Service Bulletin/Repair Instructions
Safety Recall â Interim Notification - The Daytime Running Lamps (DRLs) may turn off while the vehicle is in motion and the headlamps, fog lamps or turn signals are not on. This is non-compliant with Canadian Regulation CMVSS 108, which states that the DRLs must be on while the vehicle is in motion without certain other lamps being activated. This bulletin will be updated when a repair is available.
15-029
Service Bulletin/Repair Instructions
Information Only - Power steering reservoir cap may separate during removal when it is pulled upward instead of twisted.
02-161
Service Bulletin/Repair Instructions
Non-Safety Campaign- Chassis Fairings become loose and rattle.
21PBB
Service Bulletin/Repair Instructions
Safety Campaign - Cummins Engine Flywheel Capscrews improperly torqued. Cummins Recall C2402.
32-017
Service Bulletin/Repair Instructions
Non-Safety Campaign - The batteries may drain quickly due to the VECU not going to sleep. Software update required.
32-018
Service Bulletin/Repair Instructions
Non-Safety Campaign â Chassis with the City Horn option may generate unexpected alerts. A VECU software update is available to resolve the issue.
02-160
Service Bulletin/Repair Instructions
Information Only â Windshield washer pumps have a high No Trouble Found rate. Washer pumps may fail to spray due to a clogged filter.
T011
Service Bulletin/Repair Instructions
Fix-As-Fail - Prior versions of PACCAR transmission software may be prone to setting Linear Clutch Actuator (LCA) fault codes leading to possible LCA hardware replacement.
26-035
Service Bulletin/Repair Instructions
Non-safety campaign: Vehicles equipped with an Eaton Endurant 12 speed transmission may experience transmission service lamp activation, no gear engagement from neutral, and/or DTC 511 FMI 7 or 10 is set. Resolution is to update the transmission software and calibrations.
26-037
Service Bulletin/Repair Instructions
Fix-As-Fail - Prior versions of Eaton Endurant transmission software may be prone to setting Linear Clutch Actuator (LCA) fault codes leading to possible LCA hardware replacement.
13-055
Service Bulletin/Repair Instructions
Fix as Fail: Peterbilt has introduced an improved mounting bracket for low mount air tanks for vehicles built between January 01, 2017 and July 06, 2020. Torsional vibration may stress the currently-installed brackets and cause them to fail near the bottom of the frame rail.
02-158
Service Bulletin/Repair Instructions
Fix as Fail: Peterbilt has determined that certain model 348, 365, 367, 382, 384, 386, 388, 389, 567, 579, and 587 trucks, built between 4/13/2010 and 3/16/2020 and equipped with a flush mounted battery box, utilized rubber washers that could rub through and cause the aluminum box mounting tabs to rub directly on the steel frame brackets. This could result in cracked battery box mounting angles. Resolution is to add the reinforcement bracket(s) to affected vehicles.
43-067
Service Bulletin/Repair Instructions
Fix as Fail: For all conventional models, except 387/587, equipped with Side-of-Cab (âSOCâ) exhaust and built from 03/6/2006 to 1/20/2020, the clamps that secure the SOC exhaust stacks may not be tightened properly. This may allow the exhaust stack to rotate and contact the cab or sleeper.
32-015
Service Bulletin/Repair Instructions
Information Only: This bulletin provides dealers with a battery warranty quick reference guide to ensure the appropriate tests for battery warranty are performed in order to prevent battery warranty claims filed with incorrect or incomplete information.
02-157
Service Bulletin/Repair Instructions
Fix as Fail: Certain model 567 and 579 vehicles may have been built with a windshield seal that could delaminate. Vehicles built from 9/27/2019 through 2/06/2020 with windshield Julian date codes between 263 of 2019 and 031 of 2020 could be affected. Resolution is to replace any failed windshields with a delaminated seal.
116-1
Service Bulletin/Repair Instructions
SmartNav 2.0 Hardware retrofit for quality validation and vehicle validation units.
Reading this report
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.