2021 Peterbilt 579 technical service bulletins
119 technical service bulletins and manufacturer communications cover the 2021 Peterbilt 579, including 2 warranty extensions.
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- KW & PB 14 fuel injector part numbers (seven for MX-11 and seven for MX-13 engines) have been added to...
- 7/700 Service Agreement
- The new 2.1m day cab lift tools, a Level 3 mandatory tool, are now available to order.
- Certain chassis equipped with an engine model year 2019
- This optional software update is expected to be available after 10/30/2026 for chassis equipped with EMY...
- Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes
- An exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
- The procedure has been updated to include additional steps for verifying the software level on the vehicle...
- The verbiage in the Introduction section has been updated.
- 235 chassis have been removed from the chassis list and unflagged in PRWS due to expiration of applicable...
- This optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and...
- Incorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson...
- The Condition, Chassis Affected, Service Action, Warranty, and Procedure sections have been updated to...
- The software is not yet available
- 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 the point of contact for sourcing the MX Engine Overlay Harness Kits
- Troubleshooting procedures for 2.1m cab power windows are now available.
- (KW) Certain T680 / T800 / T880 / W900 / W990 have updated GHG labels available for order and installation.
- Procedures have been updated to include additional truck models in the service intervals table.
- Fix-as-Fail On certain Kenworth T680 chassis equipped with PACCAR MX-13 engines, wiring to the Horton...
- The attached procedures document has been updated with more detail and explanations
- Bogie Crossmember Torque Value Update
- EPA17-24 mx
- Bulletin Update 03/02/2026
- Expiration Date Format Update
- Engine Air Filter Servicing UPDATE
- One-Piece Aluminum Crossmember Repair
- The Parts section has been updated to clarify that freight charges for safety recall orders should not be...
- Procedure pictures updated for clarity
- The right-hand shift stalk may have an improper wire harness terminal crimp within the wire harness connector
- Repair procedures and warranty information for model 520EV are now available
- Repair procedures and warranty information for model 520EV are now available
- Condition, Chassis Affected, and Warranty sections updated with the following verbiage “E311 must be...
- 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...
- T016: Warranty section updated to include 0.5 hours for test drive
- 4/29/2025
- Vehicles equipped with PACCAR MX engines with Engine Software Version NA202 or NA206 may display a dash...
- Certain Peterbilt 579EV and 520EV Battery Electric Vehicles were built prior to the availability of...
- Safety Recall Updated software and procedures are now available
- Some 579EV and 520EV BEV trucks may have loose or improperly torqued ESS gland nuts
- Info Only Unnecessary starter replacements can result from customer complaints regarding engine starting...
- Fix-as-fail
- Information Only Storage guideline procedures are now available for both Medium Duty and Heavy-Duty...
- Information Only New diagnostic tool is required to support PACCAR Ethernet Multiplexed Architecture...
- Bulletin updated to include oil pan drain plug in parts list and incorporated QR code to direct dealers to...
- BEV Phase 2 tools have been added to the BEV required tools lists.
- Fix As Fail The height control valve (HCV) rod on vehicles with low air leaf suspensions is prone to...
- Information Only Vehicles equipped with Digital Vision System (DVS) Mirror Mounted Cameras, that do not...
- Fix As Fail – Dimensions and instructions are available for trimming the radiator recirculation shields to...
- Fix As Fail – Dimensions and instructions are available for trimming the radiator recirculation shields to...
- Updated procedures and SRT time to include Fuel Filter replacement during cleaning process
- Safety Recall Parts are now available to remedy this issue
- Fix As Fail Updated: Two part numbers added: 1818119 DPF Delta Pressure Sensors for MX-13-2 EMY18 2200138...
- Interim Safety Recall Certain model year 2021 to 2024, 567 and 579 vehicles built from 06/22/2020 through...
- Incorrect fuel filter drain and replacement procedures on EPA21 MX-11 and MX-13 engines can result in the...
- A testing procedure has been created for the coolant level sensor on model 520.
- Certain 579 MLU chassis equipped with Cummins X15 engines have fan hub bracket hardware that are incorrect...
- Campaign Certain EPA2021 chassis equipped with PACCAR MX engines have Selective Catalytic Reduction (SCR)...
- For all Peterbilt chassis equipped with an air shifted PTO. Oil from the air shift cover of the PTO may...
- Fix-as-Fail
- Update - 06-09-2023
- PACCAR will reimburse customers for the local purchase of in-tank fuel additive for EPA2021 compliant MX...
- Certain 579 chassis are eligible to receive production level Digital Display software, Digital Display,...
- Fix As Fail – All New Model 579 chassis with Bendix radar opti on may have a harness rub against the...
- Fix As Fail – Certain 579, and New Model 579 chassis that were manufactured with a Bendix forward looking...
- Fix-as-fail –
- Model 579 A-pillar fairing adhesive is not properly securing the fairing to the cab structure.
- Certain Model Year 2021-2024 chassis with PACCAR MX engines and optional fuel filter restriction virtual...
- This campaign is the final opportunity to replace the oil filter screw cap to reduce occurrences of broken...
- On some new model 579 chassis, the front frame tow pins do not fit (or require adjustment to fit in the...
- 21PBN – lng/cng
- Info Only
- Fix-As-Fail On certain chassis with Low Air Leaf Suspension or Low-Low Air Leaf Suspension, the Height...
- Fix-As-Fail: Forces being applied to the split fender and fairing structure are causing the connection to...
- The service information for Bendix Air Dryer maintenance is being updated to include new procedures.
- Non-Safety Campaign – The PACCAR MX-13 J2 engine harness may not be properly secured, resulting in...
- Info Only
- Information Only
- ÂFix-As-Fail â If a customer comes into your dealership and demonstrates the condition above, replace...
- A roof fairing reinforcement kit increases structural support for one-piece 579 roof fairings that are...
- This bulletin provides information on the EPA21 MX fuel injector cleaning procedure and includes suggested...
- Fix-As-Requested
- Information Only – New Level 1 required tools are available to support MY21B MX engines.
- Fix-As-Fail â A hill start assist (HSA) valve plumbing revision eliminates ice buildup in the HSA valve...
- A frame mounted left-hand marker light bracket interferes with the rear fuel tank fill location
- Due to major data carriers phasing out 3G networks, chassis currently utilizing first generation Peoplenet...
- Safety Recall – Chassis Fairings with integrated cab step may become loose, allowing minor unintended...
- Interim Safety Recall â Methane detection system will not warn the operator if the system loses power
- Information Only: Due to differences between the PACCAR MX-11 or MX-13 2021A and 2021B engines,...
- Non-Safety Campaign â An incorrectly set VECU software parameter is causing the running lamps to be...
- Non-Safety Campaign: Certain DC tools were incorrectly calibrated
- Non-Safety Campaign:Â Eaton Endurant transmissions may experience premature Main Drive Gear damage due to...
- ÂSafety Recall â Work Brake May Unintentionally Disengage â the federal safety agency ID: 21V906,...
- Non-Safety Campaign: Drivers of vehicles equipped with PACCAR TX-12 transmissions may experience harsh...
- Fix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are...
- Information Only
- ÂSafety Recall â Hill Start Assist (HSA) Valve Clearance â the federal safety agency ID: 21V-648,...
- A DPF regeneration two-position switch parameter is causing inhibited DPF regeneration
- Safety Recall – Interim Notification
- Information Only
- Non-Safety Campaign- Chassis Fairings become loose and rattle.
- Safety Campaign
- Non-Safety Campaign
- Non-Safety Campaign – The batteries may drain quickly due to the VECU not going to sleep
- Non-Safety Campaign – Chassis with the City Horn option may generate unexpected alerts
- Information Only – Windshield washer pumps have a high No Trouble Found rate
- Fix-As-Fail
- Non-safety campaign: Vehicles equipped with an Eaton Endurant 12 speed transmission may experience...
- Fix-As-Fail
- Fix as Fail The HVAC system, on model 579 and 567 vehicles manufactured since 1/20/2012 may have...
- Fix as Fail: Peterbilt has introduced an improved mounting bracket for low mount air tanks for vehicles...
- Electrical system: 12v/24v/48v battery
- Fix as Fail: For all conventional models, except 387/587, equipped with Side-of-Cab (“SOC”) exhaust and...
- Information Only:
- Fix as Fail: Certain model 567 and 579 vehicles may have been built with a windshield seal that could...
- SmartNav 2.0 Hardware retrofit for quality validation and vehicle validation units.
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