2014 Peterbilt 320 technical service bulletins

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

• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• Nov 22, 2024 Service bulletinInfo Only Unnecessary starter replacements can result from customer complaints regarding engine starting...
• Aug 3, 2022 Service bulletinThe service information for Bendix Air Dryer maintenance is being updated to include new procedures.
• Jun 8, 2021 Service bulletinAn engine software update is required to resolve OBD system readiness, DEF doser diagnostics, and otherOBD...
• Feb 10, 2021 Service bulletinInformation Only – Windshield washer pumps have a high No Trouble Found rate
• Jun 10, 2020 Service bulletinFix as Fail: For all conventional models, except 387/587, equipped with Side-of-Cab (“SOC”) exhaust and...
• Jun 8, 2020 Service bulletinInformation Only:
• May 29, 2020 Service bulletinInformation only: Hendrickson Softek front axle maintenance intervals and requirements.
• Mar 17, 2020 Service bulletinInformation Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment...
• Mar 3, 2020 Service bulletinInformation Only – Vehicles may have the connector seals on the wheel speed sensor incorrectly installed,...
• Feb 28, 2020 Service bulletinInformation Only: Vehicles may have the connector seal on the wheel speed sensor incorrectly installed,...
• Dec 18, 2019 Service bulletinInformation Only
• Dec 11, 2019 Service bulletinFix as Fail: Peterbilt has initiated an improvement to the Model 320/520 power window module
• Nov 22, 2019 Service bulletinInformation only: Some model 320 and 520 vehicles built before 3/11/2019 may experience loss or loosening...
• Nov 6, 2019 Service bulletinInformation Only:
• Sep 27, 2019 Service bulletinInformation Only –
• Aug 23, 2019 Service bulletinFix-As-Fail: Two separate causes have been identified as root
• Jul 19, 2019 Service bulletinSafety Recall: Vehicles fail to confirm with FMVSS/CMVSS No 108 Table 1-a requirements which requires 2...
• Jun 10, 2019 Service bulletinFix as Fail: Vehicles built with NAMUX software part number P30-1032-xxx and not updated require an ESA...
• Jun 10, 2019 Service bulletinInformation Only
• Apr 8, 2019 Service bulletinInformation Only: Proper instructions for closure of power distribution box cover to prevent corrosion.
• Jan 4, 2019 Service bulletinInformation: Bendix ACOM Software version 6.16.5.0 for diagnostics may introduce an unrecoverable error
• Jul 23, 2018 Service bulletinInformation
• Jan 22, 2018 Service bulletinFix-As-Fail ? There is an updated plug to fix leaking steer axle hubcaps.
• Sep 27, 2017 Service bulletinFix-As-Fail: Repair for horizontal exhaust diffuser configurations with broken brackets or cracked diffuser.
• Aug 11, 2014 Service bulletinPeterbilt: certain trucks, at time of assembly, may not have a properly seated upper reverse idler feed...
• Jun 27, 2014 Service bulletinPeterbilt: the malfunction indicator lamp (MIL) illuminates due to an engine control unit (ECU) software...
• Jan 31, 2014 Service bulletinPeterbilt: an active fault code 3911, ammonia sensor communication, may be displayed and a repair strategy...
• Oct 22, 2013 Service bulletinCummins: the relays and fuses of aftertreatment systems, in wiring harness, is potentially not adequately...