2021 Peterbilt 535 technical service bulletins

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

• Nov 4, 2026 Service bulletinThe new 2.1m day cab lift tools, a Level 3 mandatory tool, are now available to order.
• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• 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 6, 2026 Service bulletinTroubleshooting procedures for 2.1m cab power windows are now available.
• Feb 11, 2026 Service bulletinThe Parts section has been updated to clarify that freight charges for safety recall orders should not be...
• Nov 26, 2025 Service campaignThe right-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector
• Mar 26, 2025 Service campaignAs of 03/25/2025, this campaign has resumed
• Nov 22, 2024 Service bulletinInfo Only Unnecessary starter replacements can result from customer complaints regarding engine starting...
• May 16, 2024 Service bulletinInformation Only New tools are required to support PACCAR TX-8 / ZF transmissions
• Mar 25, 2024 Service bulletinInterim
• 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 bulletinChassis with a PACCAR TX-8 transmission without cruise control may have active transmission faults 86-2...