2020 Peterbilt 579 technical service bulletins
107 technical service bulletins and manufacturer communications cover the 2020 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 DEF
- 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...
- 105 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...
- Troubleshooting procedures for 2.1m cab power windows are now available.
- 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
- Engine Air Filter Servicing UPDATE
- One-Piece Aluminum Crossmember Repair
- Procedure pictures updated for clarity
- Condition, Chassis Affected, and Warranty sections updated with the following verbiage “E311 must be...
- 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
- Info Only Unnecessary starter replacements can result from customer complaints regarding engine starting...
- 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...
- 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 Updated: Two part numbers added: 1818119 DPF Delta Pressure Sensors for MX-13-2 EMY18 2200138...
- A testing procedure has been created for the coolant level sensor on model 520.
- For all Peterbilt chassis equipped with an air shifted PTO. Oil from the air shift cover of the PTO may...
- Certain 579 MLU chassis equipped with Cummins X15 engines have fan hub bracket hardware that are incorrect...
- Fix-as-Fail
- 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 – Chassis that were manufactured with certain battery cable routing brackets may experience...
- This campaign is the final opportunity to replace the oil filter screw cap to reduce occurrences of broken...
- 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.
- A roof fairing reinforcement kit increases structural support for one-piece 579 roof fairings that are...
- Fix-As-Fail â A hill start assist (HSA) valve plumbing revision eliminates ice buildup in the HSA valve...
- The Turbo Inlet Elbow is susceptible to tearing, potentially allowing dust to enter the engine
- 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...
- Retrofit
- Interim Safety Recall â Methane detection system will not warn the operator if the system loses power
- 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...
- Non-Safety Campaign
- 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,...
- Fix-as-Fail: Radio does not mute when truck with auto trans is placed in reverse
- Safety Recall – TSE Brake Chamber Air Leak – the federal safety agency ID: 21V328
- Safety Recall – Interim Notification
- ÂNon-Safety Campaign -Â Certain Peterbilt Model 579 vehicles may have an incorrect blind spot sensor...
- Non-Safety Campaign- Chassis Fairings become loose and rattle.
- 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...
- Information only: In 2020, Peterbilt and Kenworth began using the same M10, M12, M16, and M20 frame...
- Electrical system: 12v/24v/48v battery
- Fix-As-Fail
- Fix as Fail: For all conventional models, except 387/587, equipped with Side-of-Cab (“SOC”) exhaust and...
- Information Only:
- Information only: Hendrickson Softek front axle maintenance intervals and requirements.
- Safety Recall: the federal safety agency recall number is 20V130
- Electrical system
- Electrical system
- Information Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment...
- Fix as Fail: Certain model 567 and 579 vehicles may have been built with a windshield seal that could...
- Information Only: The AutoStart System Test does not recognize the hood opening and closing when running...
- Electrical system: instrument cluster/panel
- Electrical system: instrument cluster/panel
- Information Only
- Fix-As-Fail
- Information Only:
- Safety Recall: A regulatory non-compliance, may exist in certain model 579 vehicles manufactured between...
- Information Only â
- Suspension
- Fix as Fail: Certain model 579 and 567 vehicles equipped with Eaton Endurant or PACCAR AMT transmissions,...
- Fix as Fail Vehicles are susceptible to noise interference due to an incorrect V-Can wiring in the roof...
- Fix-As-Fail -Â Composite fittings used in the cooling system may crack, resulting in coolant leaks
- Fix-As-Fail: Two separate causes have been identified as root
- Fix as Fail Vehicles equipped with chassis fairings may have battery box openings that allow debris to...
- Fix as Fail HVAC system may demonstrate inadequate temperature control, be stuck in defrost mode, or have...
- Non Safety Campaign: ZF (supplier) steering gear boxes may have a sealing plug not seated corrected...
- Information Only
- Visibility
- Fix-As-Fail ? Intermittent throttle hesitation may be encountered after installing an optional PTO connector.
- Information Only: Proper instructions for closure of power distribution box cover to prevent corrosion.
- SmartNav 2.0 Hardware retrofit for quality validation and vehicle validation units.
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