2020 Peterbilt 389 technical service bulletins

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

• Apr 17, 2026 Warranty extensionKw & pb DEF
• Oct 22, 2024 Warranty extension7/700 Service Agreement
• Oct 30, 2026 Service bulletinCertain chassis equipped with an engine model year 2019
• Oct 30, 2026 Service bulletinThis optional software update is expected to be available after 10/30/2026 for chassis equipped with EMY...
• Sep 11, 2026 Service bulletinKenworth: Dealers should check the chassis list and SIR weekly for VIN changes
• Sep 5, 2026 Service bulletinAn exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
• Aug 13, 2026 Service bulletinThe procedure has been updated to include additional steps for verifying the software level on the vehicle...
• Jul 25, 2026 Service bulletin105 chassis have been removed from the chassis list and unflagged in PRWS due to expiration of applicable...
• 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
• Jun 29, 2026 Service bulletinAn optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR...
• Apr 17, 2026 Service bulletinThe attached procedures document has been updated with more detail and explanations
• Apr 1, 2026 EmissionsEPA17-24 mx
• Jan 31, 2026 Service bulletinProcedure pictures updated for clarity
• Aug 20, 2025 OtherCondition, Chassis Affected, and Warranty sections updated with the following verbiage “E311 must be...
• May 22, 2025 Service bulletinT016: Warranty section updated to include 0.5 hours for test drive
• Nov 22, 2024 Service bulletinInfo Only Unnecessary starter replacements can result from customer complaints regarding engine starting...
• Nov 11, 2024 Service bulletinFix-As-Fail The window switch fails prematurely due to excessive amperage flowing through the window...
• Jul 30, 2024 Service bulletinFix As Fail The height control valve (HCV) rod on vehicles with low air leaf suspensions is prone to...
• Nov 2, 2023 Service bulletinFix As Fail Updated: Two part numbers added: 1818119 DPF Delta Pressure Sensors for MX-13-2 EMY18 2200138...
• Feb 10, 2023 Service bulletinFix As Fail – Chassis that were manufactured with certain battery cable routing brackets may experience...
• Nov 18, 2022 Service bulletinCertain model 389 chassis are experiencing freezing of the A/C evaporator or frosting of the compressor...
• Nov 10, 2022 Service bulletin34-093
• Oct 18, 2022 Service bulletinInfo Only
• Oct 6, 2022 Service bulletinClutch pedal linkage lubrication service interval information is missing from the Service manual for Model...
• Sep 9, 2022 Service bulletinFix-As-Fail On certain chassis with Low Air Leaf Suspension or Low-Low Air Leaf Suspension, the Height...
• Aug 3, 2022 Service bulletinThe service information for Bendix Air Dryer maintenance is being updated to include new procedures.
• Aug 2, 2022 Service bulletinDuring PTO mode, the engine will not ramp up to the set RPM speed.
• Mar 3, 2022 Service bulletinFix-As-Fail – A hill start assist (HSA) valve plumbing revision eliminates ice buildup in the HSA valve...
• Feb 4, 2022 Service bulletinA frame mounted left-hand marker light bracket interferes with the rear fuel tank fill location
• Feb 4, 2022 Service bulletinDue to major data carriers phasing out 3G networks, chassis currently utilizing first generation Peoplenet...
• Jan 10, 2022 Service bulletinRetrofit
• Dec 2, 2021 Service bulletin€‹Safety Recall – Work Brake May Unintentionally Disengage – the federal safety agency ID: 21V906,...
• Sep 21, 2021 Service bulletinFix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are...
• Sep 20, 2021 Service bulletinInformation Only
• Sep 7, 2021 Service bulletin€‹Safety Recall – Hill Start Assist (HSA) Valve Clearance – the federal safety agency ID: 21V-648,...
• Jul 19, 2021 Service bulletinFix-as-Fail: Radio does not mute when truck with auto trans is placed in reverse
• Jun 14, 2021 Service bulletinSafety Recall – Interim Notification
• Mar 24, 2021 Service bulletinSafety Campaign
• Feb 10, 2021 Service bulletinInformation Only – Windshield washer pumps have a high No Trouble Found rate
• Oct 1, 2020 Service bulletinFix as Fail: Peterbilt has introduced an improved mounting bracket for low mount air tanks for vehicles...
• Sep 25, 2020 Service bulletinInformation only: In 2020, Peterbilt and Kenworth began using the same M10, M12, M16, and M20 frame...
• Sep 16, 2020 Service bulletinPower train
• Aug 25, 2020 Service bulletinElectrical system: 12v/24v/48v battery
• Jul 29, 2020 Service bulletinFix-As-Fail
• 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.
• Apr 17, 2020 Service bulletinSafety Recall: the federal safety agency recall number is 20V130
• Mar 31, 2020 Service bulletinElectrical system
• Mar 17, 2020 Service bulletinInformation Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment...
• Dec 20, 2019 Service bulletinPower train
• Dec 18, 2019 Service bulletinInformation Only
• Nov 6, 2019 Service bulletinInformation Only:
• Sep 27, 2019 Service bulletinSuspension
• Sep 25, 2019 Service bulletinSteering
• Jul 13, 2016 Service bulletinSmartNav 2.0 Hardware retrofit for quality validation and vehicle validation units.