2023 Peterbilt 579 technical service bulletins
92 technical service bulletins and manufacturer communications cover the 2023 Peterbilt 579, including 3 warranty extensions.
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to...
- Fuel Injection Pump part number 2344776PEX for MX-13 engines has been added to this warranty policy.
- 32 fuel injector part numbers (16 for MX-11 and 16 for MX-13) have been added to this warranty policy.
- The new 2.1m day cab lift tools, a Level 3 mandatory tool, are now available to order.
- RMI procedures have been updated to reduce the risk of progressive damage to the rocker arms
- Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes
- An exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
- KW: On certain T680 BEV chassis, installing an updated A/C suction line between the A/C compressor and...
- The procedure has been updated to include additional steps for verifying the software level on the vehicle...
- The verbiage in the Introduction section has been updated.
- 235 chassis have been removed from the chassis list and unflagged in PRWS due to expiration of applicable...
- Certain unaffected chassis have been removed from the chassis population.
- This optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and...
- Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson...
- The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to...
- The software is not yet available
- An optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR...
- KW: A new recommended repair has been added to verify the software level and close the campaign in SIR.The...
- Updated primary and/or secondary chassis modules for certain pre-production Kenworth chassis are now...
- Warranty section has been updated to include hood length definitions and filing instructions for...
- Troubleshooting procedures for 2.1m cab power windows are now available.
- (KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
- Procedures have been updated to include additional truck models in the service intervals table.
- Certain EPA21 PACCAR MX engines are equipped with PHINIA fuel injectors that do not meet PHINIA’s...
- Fix-as-Fail On certain Kenworth T680 chassis equipped with PACCAR MX-13 engines, wiring to the Horton...
- (KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation
- The attached procedures document has been updated with more detail and explanations
- Bogie Crossmember Torque Value Update
- E335 Warranty wording update Apr 2026
- EMY21-25 ghg
- EPA17-24 mx
- Bulletin Update 03/02/2026
- Engine Air Filter Servicing UPDATE
- One-Piece Aluminum Crossmember Repair
- Sheppard Recall Order Process Update
- The Parts section has been updated to clarify that freight charges for safety recall orders should not be...
- Procedure pictures updated for clarity
- Parts and procedures are now available for all affected chassis equipped with Vehicle Electronic Control...
- The right-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector
- Certain chassis equipped with a PACCAR TX-12 transmission have Mechatronic Transmission Module (MTM) rail...
- Repair procedures and warranty information for model 520EV are now available
- Repair procedures and warranty information for model 520EV are now available
- Procedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and...
- Newly designed fuel injectors are available for EPA2021 compliant PACCAR MX-series engines to optimize...
- 5/29/2025: A new Ethernet Multiplexed Architecture (EMUX) Service Tool Kit service manual (SM034-022) has...
- T016: Warranty section updated to include 0.5 hours for test drive
- Sudden loss of high voltage power with unintended opening of electrical contractors, which may occur...
- 4/29/2025
- Safety Recall – Interim Notification Certain Battery Electric Vehicle (BEV) chassis equipped with certain...
- Vehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash...
- Certain Peterbilt 579EV and 520EV Battery Electric Vehicles were built prior to the availability of...
- Safety Recall Updated software and procedures are now available
- Some 579EV and 520EV BEV trucks may have loose or improperly torqued ESS gland nuts
- Info Only Unnecessary starter replacements can result from customer complaints regarding engine starting...
- Fix-as-fail
- Information Only Storage guideline procedures are now available for both Medium Duty and Heavy-Duty...
- Information Only New diagnostic tool is required to support PACCAR Ethernet Multiplexed Architecture...
- Bulletin updated to include oil pan drain plug in parts list and incorporated QR code to direct dealers to...
- BEV Phase 2 tools have been added to the BEV required tools lists.
- Fix As Fail The height control valve (HCV) rod on vehicles with low air leaf suspensions is prone to...
- Information Only Vehicles equipped with Digital Vision System (DVS) Mirror Mounted Cameras, that do not...
- CARB Emission s Manufacturer Warranty term and/or kilometers conversion displayed in certain EMY 2022-2023...
- Fix As Fail – Dimensions and instructions are available for trimming the radiator recirculation shields to...
- Fix As Fail – Dimensions and instructions are available for trimming the radiator recirculation shields to...
- Updated procedures and SRT time to include Fuel Filter replacement during cleaning process
- Safety Recall Parts are now available to remedy this issue
- Interim Safety Recall Certain model year 2021 to 2024, 567 and 579 vehicles built from 06/22/2020 through...
- Incorrect fuel filter drain and replacement procedures on EPA21 MX-11 and MX-13 engines can result in the...
- A testing procedure has been created for the coolant level sensor on model 520.
- Certain 579 MLU chassis equipped with Cummins X15 engines have fan hub bracket hardware that are incorrect...
- For all Peterbilt chassis equipped with an air shifted PTO. Oil from the air shift cover of the PTO may...
- There is currently a repair procedure available for model 579EV that will address issues caused by the...
- On certain Model Year 2022 and 2023, 579 MLU trucks, built between 04/26/2021 and 07/29/2022, equipped...
- Fix-as-Fail
- Safety Recall Bendix has established a repair procedure and is providing the parts to update and correct...
- PACCAR will reimburse customers for the local purchase of in-tank fuel additive for EPA2021 compliant MX...
- Certain 579 chassis are eligible to receive production level Digital Display software, Digital Display,...
- Fix As Fail – All New Model 579 chassis with Bendix radar opti on may have a harness rub against the...
- Fix-as-fail –
- RFID (Radio Frequency ID) tags are being added and used to track Non-Test Ready (NTR) trucks to...
- Certain 1.9m model cab door power windows may need some added lubrication to enhance window operating...
- Certain 2.1m cab windows may need some adjustments to ensure they are fully seated on the window regulator...
- Battery monitor module parts are now available
- Certain Model Year 2021-2024 chassis with PACCAR MX engines and optional fuel filter restriction virtual...
- The emissions exemption expired on 12/31/2022 for certain pre-production vehicles equipped with PACCAR...
- Peterbilt SmartLINQ subscriptions can be renewed online via PACCAR Solutions RemoteDiagnostics web portal.
- This is a follow-up bulletin to shortage bulletin S017
- Info Only
- The service information for Bendix Air Dryer maintenance is being updated to include new procedures.
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