2025 Peterbilt 520 technical service bulletins
64 technical service bulletins and manufacturer communications cover the 2025 Peterbilt 520, including one warranty extension.
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- 32 fuel injector part numbers (16 for MX-11 and 16 for MX-13) have been added to this warranty policy.
- An upgraded power steering pump is available for certain Model 520 chassis with a RHSU or dual steering...
- There is an update to the CARB Base Emissions Warranty Limits table and Manufacturer’s Warranty Coverage...
- Eaton service bulletin TAIB-1026 instructs dealers to update the master switch module (MSM) software
- Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes
- KW: A link to the PACCAR Powertrain Prognostics Webcast has been added in the Links section
- KW: The chassis list has been updated to include 1 chassis
- This optional software update is expected to be available after 08/28/2026.
- PB: The chassis list has been updated to include 11 chassis
- The procedure has been updated to include additional steps for verifying the software level on the vehicle...
- When DAVIE version 26.21.2 is used to update the VECU3 to software version 3.4.46.0, the VECU3 5071...
- The verbiage in the Introduction section has been updated.
- This optional software update is expected to be available in late August 2026 for chassis equipped with...
- Chassis list has been updated to include 10 chassis
- Updated Sheppard Steering Gear Classification Tool link in Inspection Procedure
- KW -The chassis list has been updated to include 2 chassis
- This optional software update is expected to be available on 08/07/26 for chassis equipped with EPA 2024...
- Certain unaffected chassis have been removed from the chassis population.
- An optional software update is expected to be available on or after 07/31/26 for chassis equipped with EPA...
- This optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and...
- The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to...
- The software is not yet available
- Additional US chassis have been added, along with additional Canadian chassis under identical safety...
- (KW): Certain Kenworth K270 and K370 Battery Electric Vehicle (BEV) chassis equipped with certain DANA...
- Leveraging PACCAR’s advanced Prognostic prediction algorithms, certain PACCAR MX-11 and MX-13 EMY...
- 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 cross shaft and bearing installation steps have been added to the repair procedures.
- There is an update to the CARB Base Emissions Warranty Limits table and Manufacturer’s Warranty Coverage...
- Certain Peterbilt Model 520 BEV chassis with an Accelera Power Control and Accessory System (PCAS) were...
- Certain EPA21 PACCAR MX engines are equipped with PHINIA fuel injectors that do not meet PHINIA’s...
- EPA17-24 mx
- Battery Electric Vehicle (BEV) de-energizing and re-energizing procedures have been added to the bulletin...
- CARB Label Procedure Update The repair procedure removes the aftermarket change request, adds GHG label...
- Certain Battery Electric Vehicles that are subject to California Air Resources Board (CARB) regulations...
- Certain Kenworth L770 and Peterbilt Model 520 chassis may encounter a slight increase in effort in the...
- Parts and procedures are now available for all affected chassis equipped with Vehicle Electronic Control...
- Repair procedures and warranty information for model 520EV are now available
- Repair procedures and warranty information for model 520EV are now available
- All parts necessary to complete Phase 2 of
- Procedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and...
- A required spacer tool set is now available to streamline the injector replacement process
- All EMUX retrofit procedures updated to make it clear that the VECU3 must have software updated 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...
- Sudden loss of high voltage power with unintended opening of electrical contractors, which may occur...
- 4/29/2025
- Due to parts availability issues,
- Safety Recall – Interim Notification Certain Battery Electric Vehicle (BEV) chassis equipped with certain...
- As of 03/25/2025, this campaign has resumed
- Vehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash...
- Safety Recall Specific 2024 Peterbilt Model 367, 389, 548, and 2024-2025 520 and 567 chassis equipped with...
- Safety Recall Updated software and procedures are now available
- Interim Safety Recall Specific 2024 Peterbilt model 367, 389, 548, and 2024-2025 Peterbilt 520 and 567...
- Some 579EV and 520EV BEV trucks may have loose or improperly torqued ESS gland nuts
- TCS case requirements for EMUX software and PACCAR MX Pack 2 injector upfit have been removed
- Fix-as-fail
- Information Only New diagnostic tool is required to support PACCAR Ethernet Multiplexed Architecture...
- BEV Phase 2 tools have been added to the BEV required tools lists.
- CARB Emission s Manufacturer Warranty term and/or kilometers conversion displayed in certain EMY 2022-2023...
- This Bulletin contains parts ordering and replacement procedures for Steering Gears identified as SUSPECT...
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