2022 Peterbilt 520 technical service bulletins

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

• Jun 24, 2026 Warranty extensionKW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to...
• Oct 29, 2026 Service bulletinAn upgraded power steering pump is available for certain Model 520 chassis with a RHSU or dual steering...
• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• Aug 13, 2026 Service bulletinThe procedure has been updated to include additional steps for verifying the software level on the vehicle...
• Aug 13, 2026 Service bulletinThe verbiage in the Introduction section has been updated.
• Jul 22, 2026 Service bulletinCertain unaffected chassis have been removed from the chassis population.
• Jul 21, 2026 Service bulletinThis optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and...
• Jul 10, 2026 Service bulletinThe Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to...
• Jul 7, 2026 Service bulletinThe software is not yet available
• Jul 2, 2026 Service campaignAdditional US chassis have been added, along with additional Canadian chassis under identical safety...
• Jul 2, 2026 Service campaign(KW): Certain Kenworth K270 and K370 Battery Electric Vehicle (BEV) chassis equipped with certain DANA...
• Jun 29, 2026 Service bulletinAn optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR...
• Jun 3, 2026 Service bulletinKW: A new recommended repair has been added to verify the software level and close the campaign in SIR.The...
• May 14, 2026 Service campaignCertain Peterbilt Model 520 BEV chassis with an Accelera Power Control and Accessory System (PCAS) were...
• Apr 30, 2026 Service campaignCertain EPA21 PACCAR MX engines are equipped with PHINIA fuel injectors that do not meet PHINIA’s...
• Apr 1, 2026 EmissionsEPA17-24 mx
• Mar 3, 2026 Service bulletinSheppard Recall Order Process Update
• Dec 13, 2025 EmissionsExempt engine label installed.
• Nov 4, 2025 Service bulletinRepair procedures and warranty information for model 520EV are now available
• Nov 4, 2025 Service bulletinRepair procedures and warranty information for model 520EV are now available
• Jun 7, 2025 Service bulletinNewly designed fuel injectors are available for EPA2021 compliant PACCAR MX-series engines to optimize...
• May 31, 2025 Service bulletin5/29/2025: A new Ethernet Multiplexed Architecture (EMUX) Service Tool Kit service manual (SM034-022) has...
• Apr 30, 2025 Service bulletinSudden loss of high voltage power with unintended opening of electrical contractors, which may occur...
• Apr 30, 2025 Service campaign4/29/2025
• Apr 8, 2025 Service bulletinSafety Recall – Interim Notification Certain Battery Electric Vehicle (BEV) chassis equipped with certain...
• Mar 26, 2025 Service campaignAs of 03/25/2025, this campaign has resumed
• Feb 27, 2025 EmissionsVehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash...
• Feb 5, 2025 Service campaignCertain Peterbilt 579EV and 520EV Battery Electric Vehicles were built prior to the availability of...
• Jan 10, 2025 Service bulletinSafety Recall Updated software and procedures are now available
• Nov 27, 2024 Service bulletinSome 579EV and 520EV BEV trucks may have loose or improperly torqued ESS gland nuts
• Nov 22, 2024 Service bulletinInfo Only Unnecessary starter replacements can result from customer complaints regarding engine starting...
• Sep 24, 2024 Service bulletinFix-as-fail
• Sep 19, 2024 Service bulletinInformation Only Storage guideline procedures are now available for both Medium Duty and Heavy-Duty...
• Sep 14, 2024 Service campaignInformation Only New diagnostic tool is required to support PACCAR Ethernet Multiplexed Architecture...
• Jul 30, 2024 Service bulletinFix As Fail The height control valve (HCV) rod on vehicles with low air leaf suspensions is prone to...
• Jul 24, 2024 Service bulletin07/24/2024
• Nov 20, 2023 Service bulletinUpdated procedures and SRT time to include Fuel Filter replacement during cleaning process
• Oct 31, 2023 Service bulletinA software fix for model 520EV that are not equipped with ESP (Stability Control) is now available
• Oct 18, 2023 Service bulletinIncorrect fuel filter drain and replacement procedures on EPA21 MX-11 and MX-13 engines can result in the...
• Oct 17, 2023 Service bulletinA testing procedure has been created for the coolant level sensor on model 520.
• May 3, 2023 Service bulletinPACCAR will reimburse customers for the local purchase of in-tank fuel additive for EPA2021 compliant MX...
• Apr 3, 2023 Service bulletinFix-as-fail –
• Oct 18, 2022 Service bulletinInfo Only
• Aug 3, 2022 Service bulletinThe service information for Bendix Air Dryer maintenance is being updated to include new procedures.
• Jul 27, 2022 Service bulletinWhen updating the software on a truck to RC6 or higher, please ensure a PM sensor is physically installed...
• Jul 12, 2022 Service bulletinInfo Only – Certain 520 model chassis built between 2014 and 2021, and equipped with the Red Dot HVAC...
• May 13, 2022 Service bulletinEmissions Recall
• Apr 4, 2022 Service bulletinEmissions Recall: Engine Model Year 2021 MX engines built to EPA 21 emission standards (MY21B) and...