2020 Peterbilt 579 Technical Service Bulletins

104 technical service bulletins (TSBs) are on record for the 2020 Peterbilt 579. TSBs are notes manufacturers send to dealers about repair procedures for issues seen in the field. They are not recalls and do not by themselves mean a vehicle has a fault.

• 10207154Jan 7, 2022Equipment, Fuel system, Electrical system. Interim Safety Recall – Methane detection system will not warn the operator if the system loses power. The driver could be unaware of an issue with the methane detection system or excessive methane present, increasing the risk of a fire, crash and/or personal injury. The repair procedure will be added when it is available.
• 10206097Dec 2, 2021Transmission and drivetrain. Non-Safety Campaign: ​Drivers of vehicles equipped with PACCAR TX-12 transmissions may experience harsh shifts and gear grinding noise. Premature Main Drive Gear damage may occur due to clutch housing and main case countershaft bearing bore wear.
• 10206090Dec 2, 2021Brakes. ​Safety Recall – Work Brake May Unintentionally Disengage – NHTSA ID: 21V906, TC: 2021-713. The work brake (also known as winch brake) may unintentionally disengage during winching operations, releasing the service brakes, increasing the risk of crash or injury. The VECU software will be updated to correctly set the speed interlock parameter.
• 10206084Dec 2, 2021Transmission and drivetrain. Non-Safety Campaign:Â Eaton Endurant transmissions may experience premature Main Drive Gear damage due to clutch housing and main case countershaft bearing bore wear. A Clutch Housing Front Cover Kit will be installed to address the issue.
• 10203783Nov 9, 2021Engine cooling, Electrical system. Non-Safety Campaign - Vehicles with a Cummins X15 engine and Horton fan drive may set Diagnostic Trouble Code (DTC) 6637 and/or 3838 due to fan speed that results in the fan remaining activated until the power is cycled. A new controller will resolve the issue.
• 10201965Sep 21, 2021Fuel system. Fix-As-Fail – Due to undersupply issues, only a limited supply of Diesel Exhaust Fluid (DEF) sensors are available. As a temporary solution, after PACCAR confirms a DEF sensor is not available, a temporary software update will allow a vehicle to continue operation with a failed DEF sensor by disabling the DEF sensor diagnostics.
• 10201956Sep 20, 2021Body and structure. Information Only - Rear axle Quarter Fenders with less than two inches of clearance between the top of the quarter fender and the bottom of the trailer/equipment are susceptible to damage. The lack of clearance could result in cracked/broken quarter fenders or complete separation if undetected or un-remedied. ​
• 10201946Sep 7, 2021Exterior lighting, Transmission and drivetrain. ​Safety Recall – Hill Start Assist (HSA) Valve Clearance – NHTSA ID: 21V-648, TC: 2021-521. Crossmember mounted Hill Start Assist valve may not have sufficient clearance to the rear axle, resulting in hose or fitting damage. Damage could cause the loss of rear brake signal, resulting in reduced braking capability and increasing the risk of a crash.
• 10199985Jul 19, 2021Equipment, Electrical system. Fix-as-Fail: Radio does not mute when truck with auto trans is placed in reverse. Software flash resolves issue.
• 10198814Jun 30, 2021Brakes. ​Safety Recall – TSE Brake Chamber Air Leak – NHTSA ID: 21V328. Meritor brake chambers were built with a misaligned park spring, which may cause a fatigue hole in the diaphragm and an internal air leak. The affected brake chambers will be replaced.
• 10198812Jun 14, 2021Exterior lighting. Safety Recall – Interim Notification - The Daytime Running Lamps (DRLs) may turn off while the vehicle is in motion and the headlamps, fog lamps or turn signals are not on. This is non-compliant with Canadian Regulation CMVSS 108, which states that the DRLs must be on while the vehicle is in motion without certain other lamps being activated. This bulletin will be updated when a repair is available.
• 10198819Jun 8, 2021Engine cooling. ​Non-Safety Campaign - Certain Peterbilt Model 579 vehicles may have an incorrect blind spot sensor installed on the right-hand side.
• 10191768Apr 13, 2021Body and structure. Non-Safety Campaign- Chassis Fairings become loose and rattle.
• 10189956Mar 24, 2021Equipment, Engine cooling. Safety Campaign - Cummins Engine Flywheel Capscrews improperly torqued. Cummins Recall C2402.
• 10188468Feb 25, 2021Engine cooling. Non-Safety Campaign – Chassis with the City Horn option may generate unexpected alerts. A VECU software update is available to resolve the issue.
• 10188467Feb 25, 2021Electrical system. Non-Safety Campaign – The batteries may drain quickly due to the VECU not going to sleep. Updated VECU software is available to resolve the issue.
• 10188550Feb 10, 2021Equipment, Visibility (wipers, defrost, mirrors). Information Only – Windshield washer pumps have a high No Trouble Found rate. Washer pumps may fail to spray due to a clogged filter.
• 10185187Dec 23, 2020Transmission and drivetrain. Fix-As-Fail - Prior versions of PACCAR transmission software may be prone to setting Linear Clutch Actuator (LCA) fault codes leading to possible LCA hardware replacement.
• 10185190Dec 18, 2020Equipment, Electrical system, Transmission and drivetrain. Fix-As-Fail - Prior versions of Eaton Endurant transmission software may be prone to setting Linear Clutch Actuator (LCA) fault codes leading to possible LCA hardware replacement.
• 10185189Dec 18, 2020Equipment, Transmission and drivetrain. Non-safety campaign: Vehicles equipped with an Eaton Endurant 12 speed transmission may experience transmission service lamp activation, no gear engagement from neutral, and/or DTC 511 FMI 7 or 10 is set. Resolution is to update the transmission software and calibrations.
• 10183724Nov 11, 2020Electrical system. Fix as Fail The HVAC system, on model 579 and 567 vehicles manufactured since 1/20/2012 may have inadequate temperature control. The HVAC may intermittently stop blowing cold air, typically after a truck restart. Driver may notice the system returns to normal after key cycle. The remedy is updating HVAC software.
• 10182219Oct 1, 2020Equipment, Brakes. Fix as Fail: Peterbilt has introduced an improved mounting bracket for low mount air tanks for vehicles built between January 01, 2017 and July 06, 2020. Torsional vibration may stress the currently-installed brackets and cause them to fail near the bottom of the frame rail.
• 10180726Sep 25, 2020Equipment, Body and structure. Information only: In 2020, Peterbilt and Kenworth began using the same M10, M12, M16, and M20 frame fasteners on all vehicles. Torque specifications for these fasteners are different from previous fasteners.
• 10179370Aug 25, 2020Electrical system, Body and structure, Equipment. Fix as Fail: Peterbilt has determined that certain model 348, 365, 367, 382, 384, 386, 388, 389, 567, 579, and 587 trucks, built between 4/13/2010 and 3/16/2020 and equipped with a flush mounted battery box, utilized rubber washers that could rub through and cause the aluminum box mounting tabs to rub directly on the steel frame brackets. This could result in cracked battery box mounting angles. Resolution is to…
• 10177935Jul 29, 2020Brakes. Fix-As-Fail - Bendix New-Gen Lightweight Steer Axle Drum Brake Spider Cracking
• 10177019Jun 10, 2020Engine cooling, Body and structure. Fix as Fail: For all conventional models, except 387/587, equipped with Side-of-Cab (“SOC”) exhaust and built from 03/6/2006 to 1/20/2020, the clamps that secure the SOC exhaust stacks may not be tightened properly. This may allow the exhaust stack to rotate and contact the cab or sleeper.
• 10177021Jun 8, 2020Electrical system. Information Only: This bulletin provides dealers with a battery warranty quick reference guide to ensure the appropriate tests for battery warranty are performed in order to prevent battery warranty claims filed with incorrect or incomplete information.
• 10176033May 29, 2020Transmission and drivetrain. Information only: Hendrickson Softek front axle maintenance intervals and requirements.
• 10174763Apr 17, 2020Electrical system, Equipment. "Safety Recall: NHTSA recall number is 20V130. A defect, which relates to motor vehicle safety, may exist in certain Model 365, 389, 567, and 579 vehicles manufactured between April 18, 2014 and March 09, 2020 with a left-hand under hood jumper start terminal. Jumper terminal battery cables may be too long, or eligible for improved routing.
• 10173211Mar 31, 2020Electrical system. Safety Recall Interim Bulletin: Peterbilt has decided that a defect, which relates to motor vehicle safety, may exist in certain Model 365, 389, 567, and 579 vehicles manufactured between April 18, 2014 and September 30, 2019 with a left-hand under hood jumper start terminal. Your vehicle may have jumper terminal battery cables that are too long, or are eligible for improved routing.
• 10173206Mar 26, 2020Electrical system. Fix as Fail: Peterbilt has determined in model 567 and 579 vehicles built after 2011, the door harnesses may fail due to repeated door open and close cycles. Resolution is to replace the door harness with a more robust designed harness if a failure is experienced.
• 10173205Mar 17, 2020Equipment. Information Only: Proper jump-starting voltage will eliminate high voltage related issues and equipment damage.
• 10173204Mar 4, 2020Visibility (wipers, defrost, mirrors). Fix as Fail: Certain model 567 and 579 vehicles may have been built with a windshield seal that could delaminate. Vehicles built from 9/27/2019 through 2/06/2020 with windshield Julian date codes between 263 of 2019 and 031 of 2020 could be affected. Resolution is to replace any failed windshields with a delaminated seal.
• 10171030Jan 3, 2020Electrical system. Information Only: The AutoStart System Test does not recognize the hood opening and closing when running the test on a model 579 or 567 chassis equipped with a VECU software version 9.8 and 9.9. The issue will be fixed on a future VECU software update. This bulletin will be updated when the resolution is available.
• 10169783Dec 20, 2019Electrical system. Fix as Fail: Peterbilt has determined that certain models 567 and 579 vehicles built after January 01, 2013 with an Espar fuel fire heater and SmartAir may have an auto On/Off malfunction at lower temperatures. User may experience lack of heat function on SmartAir if the set temperature is < 76 °F. Resolution is to install a jumper harness.
• 10169782Dec 20, 2019Electrical system. Fix as Fail: Peterbilt has determined that model 567 and 579 vehicles built after January 01, 2013 and equipped with Espar fuel fire heater and SmartAir may have temperature overshoot issue. User may experience higher sleeper interior temperature than the set temperature on the SmartAir control. Resolution is to install an additional external temperature sensor on the sleeper control panel.
• 10169787Dec 18, 2019Electrical system. Information Only - Vehicles built with NAMUX software from 2013 to present may experience accuracy issues with the tachometer. The issue can be temporarily resolved using any one of the included procedures.
• 10169781Dec 3, 2019Equipment. Fix-As-Fail - DEA5XX radio may be locked in the ON position or stuck in hi volume. A software update is available to resolve this issue.
• 10168703Nov 6, 2019Engine cooling. Information Only: This bulletin provides guidance for repairing an air-conditioning system after internal failure of the A/C compressor.
• 10168710Nov 4, 2019Equipment. Safety Recall: A regulatory non-compliance, may exist in certain model 579 vehicles manufactured between 8/26/2019 and 9/12/2019. On certain trucks, the reflective conspicuity tape on the back wall of the sleeper box was installed in incorrect locations. FMVSS 108 Section S8 2.4.2 regulations require the conspicuity tape to be placed in specific areas. A truck that does not have properly placed conspicuity tape may…
• 10165711Sep 27, 2019Suspension. Non Safety Campaign: Peterbilt has determined that certain Model 365, 384, 386, 388, 389, 3895, 587 and 579 vehicles built between March 27, 2012 and January 20, 2019 with Flex Air suspension in a 6x2 configuration have U-bolts that may fail prematurely.
• 10165583Sep 27, 2019Engine cooling, Equipment. Information Only – This bulletin provides information about the California Air Resources Board (CARB) Periodic Smoke Inspection Program (PSIP) and Heavy Duty Vehicle Inspection Program (HDVIP).
• 10165712Sep 13, 2019Electrical system, Transmission and drivetrain. Fix as Fail: Certain model 579 and 567 vehicles equipped with Eaton Endurant or PACCAR AMT transmissions, built between 5/01/2017 and 4/07/2019, may have a fluid pressure sensor rubbing or experiencing hard interference with routing brackets, power cables, wiring harnesses, or air lines in the driver’s side frame rail.
• 10164411Aug 30, 2019Electrical system. Fix as Fail Vehicles are susceptible to noise interference due to an incorrect V-Can wiring in the roof harness. A procedure for installing a V-CAN overlay will correct this issue.
• 10164378Aug 28, 2019Engine cooling. Fix-As-Fail -“ Composite fittings used in the cooling system may crack, resulting in coolant leaks. Brass fittings are available to replace the composite fittings.
• 10164375Aug 23, 2019Engine cooling. Fix-As-Fail: Two separate causes have been identified as root cause of intermittent low coolant indicator illumination.
• 10164409Aug 22, 2019Body and structure. Fix as Fail Vehicles equipped with chassis fairings may have battery box openings that allow debris to enter the box. A battery box closeout has been designed and when installed will prevent debris from entering the battery box.
• 10164369Aug 2, 2019Equipment. Fix as Fail HVAC system may demonstrate inadequate temperature control, be stuck in defrost mode, or have intermittent changes in fan speed that can be remedied with an updated HVAC software.
• 10162392Jun 10, 2019Electrical system. Information Only - Quick Reference Guide for Electric harness damage repairs.
• 10161167Jun 10, 2019Steering, Equipment. Non Safety Campaign: ZF (supplier) steering gear boxes may have a sealing plug not seated corrected allowing power steering fluid loss.

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