Technical 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.
01-093
Service Bulletin/Repair Instructions
KW: On certain T680 BEV chassis, installing an updated A/C suction line between the A/C compressor and thermostatic expansion valve (TXV) will help maintain optimal performance and protect the evaporator core tubing and TXV seals. PB: On certain Model 579 BEV chassis, installing an updated A/C suction line between the A/C compressor and thermostatic expansion valve (TXV) will help maintain optimal performance and protect the evaporator core tubing and TXV seals.
24KWL/PBL
Service Bulletin/Repair Instructions
The verbiage in the Introduction section has been updated.
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.
46-020
Service Bulletin/Repair Instructions
Certain unaffected chassis have been removed from the chassis population.
41-029
Service Bulletin/Repair Instructions
Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson air filter housings.
CE031
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.
R2601
Service Bulletin/Repair Instructions
Updated primary and/or secondary chassis modules for certain pre-production Kenworth chassis are now available for installation.
E335
Service Bulletin/Repair Instructions
Warranty section has been updated to include hood length definitions and filing instructions for progressive damage.
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.
E338
Service Campaign
Certain EPA21 PACCAR MX engines are equipped with PHINIA fuel injectors that do not meet PHINIA’s manufacturing specifications.
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.
14-036
Other
One-Piece Aluminum Crossmember Repair - Repair procedures are available to support the replacement of intermediate or midship one-piece aluminum crossmembers.
22KWE/PBE
Service Bulletin/Repair Instructions
Sheppard Recall Order Process Update - The Parts section has been updated with revised steps for opening a TCS365 Order Support – Order Inquiry case.
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.
E334
Emissions
Certain vehicle model year 2022 Kenworth chassis equipped with Engine Model Year (EMY) 2021 PACCAR MX engines may have an exempt engine label installed.
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.
FS015
Service Bulletin/Repair Instructions
Certain chassis equipped with a PACCAR TX-12 transmission have Mechatronic Transmission Module (MTM) rail cylinder cap screws that could become loose. This may cause the transmission not to shift and the transmission service lamp to illuminate.
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.
25PBC
Service Bulletin/Repair Instructions
Certain Peterbilt Battery Electric Vehicle (BEV) chassis equipped with certain Accelera High Voltage Interlock Loop(HVIL) circuit configurations may experience a sudden loss of high voltage power with unintended opening of electrical contractors, which may occur without warning. This can result in a loss of propulsion and may increase the risk of a crash. Software version verification, along with the installation of an upgraded circuit overlay harness kit, is required to address this issue.
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 2022 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.
13-065
Service Bulletin/Repair Instructions
13-065 DAVIE4 Chassis Air Leak Testing Info Only A new test is now available in DAVIE4 to properly measure chassis air system pressure decay, provide test results, and pass/fail criteria. Your DAVIE tool must be at version 24.05 or newer for the test to be available. A test procedure document has also been made available that shows all necessary setup and testing procedure criteria (procedure document attached in Links section). The DAVIE4 “Check the air pressure decay rate” test and the test procedure document MUST be followed anytime a chassis comes in for a warranty related air system repair where excessive air system pressure decay is suspected. Warranty claims filed for air system pressure decay may be denied if DAVIE4 test AND test procedure have not been followed.
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.
CE019
Service Bulletin/Repair Instructions
07/24/2024 - Updated the Emissions Warranty Coverage tables. Added new coverage tables and PartsLists for GHG/Vehicle Parts and ZEP/BEV Parts. 03/07/2022 - New Emissions bulletin which consolidates older versions and accounts for new CARBemissions requirements that go into effect with Engine Model Year 2022.
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.
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.
46-003
Service Bulletin/Repair Instructions
There is currently a repair procedure available for model 579EV that will address issues caused by the previous BEV2 R5.00_002 software update shown in the Introduction section. This repair involves replacement of the Bendix ABS ECU with an updated version and a software update to R5.00_003. Repairs for model 520EV will be available at a future date.
23PBD
Service Bulletin/Repair Instructions
On certain Model Year 2022 and 2023, 579 MLU trucks, built between 04/26/2021 and 07/29/2022, equipped with a PACCAR MX-13 engine and PACCAR 160-amp alternator, the alternator positive cable may chafe against the left-hand side, front spring bracket, top rearward fastener, if the fastener was installed with the head on the outside of the frame rail. Chafing of the alternator positive cable insulation may result in an increased risk of a fire.
01-079
Service Bulletin/Repair Instructions
Fix-as-Fail - HVAC Intermittently Stops Blowing Cold Air
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.
S021
Service Bulletin/Repair Instructions
Battery monitor module parts are now available. This bulletin update includes an installation procedure for the module and instructions to enable software functionality. Vehicles shipped with a pre-wire condition are now eligible for this customer paid installation of battery monitor modules as requested.
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.
02-173
Service Bulletin/Repair Instructions
Certain Model 579 chassis are able to have temporary chassis fairing latches updated to production-level fairing latches.
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.
13-060
Service Bulletin/Repair Instructions
The service information for Bendix Air Dryer maintenance is being updated to include new procedures.
E297
Service Bulletin/Repair Instructions
When updating the software on a truck to RC6 or higher, please ensure a PM sensor is physically installed before performing the software update.
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.
E287
Service Bulletin/Repair Instructions
Emissions Recall - Distance With MIL On and Distance Since DTC Cleared counters read zero when viewed in DAVIE4 (DM21). Slow or no response from PCI-2 when requesting freeze frame data using DAVIE4 (DM25).
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.
E285
Service Bulletin/Repair Instructions
Emissions Recall: Engine Model Year 2021 MX engines built to EPA 21 emission standards (MY21B) and manufactured without a Particulate Matter (PM) sensor are required to have a PM sensor installed and the engine software updated. This is required for chassis to comply with current emissions standards.
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.
13-059
Service Bulletin/Repair Instructions
On certain Model Year 2022Â chassis with manual transmissions, the optional âaudible alarm when door is open and park brake is not setâ feature operates incorrectly due to a software issue. Software will be corrected when available.
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.
21PBl
Service Bulletin/Repair Instructions
Electric Stability Control â Malfunction Indicator Lamp May Not Illuminate â NHTSA ID: 21V-719. An incorrectly programmed software parameter results in a failed signal from the electronic stability control (ESC) system to the dash lamp that indicates a malfunction. Updating the software parameter via Davie4 resolves the issue.
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-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.
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 â The batteries may drain quickly due to the VECU not going to sleep. Updated VECU software is available to resolve the issue.
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.