2027 Peterbilt 579 TSBs
9 Technical Service Bulletins across 7 categories
Engine
3 bulletins"The PKC Group power distribution center (PDC) in certain vehicles may be contaminated with oil, which could result in a...
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loss of power to the engine, antilock brake system, exterior lighting, windshield wipers, and/or defrost system. This issue may also result in non-compliance with multiple Federal Motor Vehicle Safety Standard (FMVSS) and Canadian Motor Vehicle Safety Standard (CMVSS) regulations, such as FMVSS/CMVSS 103 (windshield defrosting and defogging systems), 104 (windshield wiping and washing systems), and 108 (lamps, reflective devices, and associated equipment). PDC serial numbers of suspect trucks in the field will be inspected against the 26PACD Suspect Serial Number List in the Links section. If a match is identified, the PDC will be replaced."
An exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
There is an update to the Base Emissions Warranty Limits table [PR1.1]and general certification information in certain...
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Engine Model Year (EMY) 2026 MX-11 and MX-13 Operators Manuals.
Other
1 bulletin"Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes.
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2 chassis added to the chassis list. Peterbilt: Dealers should check the chassis list and SIR weekly for VIN changes. 10 chassis added to the chassis list."
HVAC & Climate
1 bulletin"(KW) Parts Shortage Due to supplier constraints, certain T680 and T880 chassis were shipped without KIMS A/C refrigerant hose assembly.
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Parts are now available for installation. (PB) Parts Shortage Due to supplier constraints, certain Model 567 and 579 chassis were shipped without Peterbilt SmartAir A/C refrigerant hose assembly. Parts are now available for installation."
Electrical
1 bulletin[SmartAir / KIMS] A/C systems may shut down prematurely when voltage levels drop below a certain threshold.
Software & Calibration
1 bulletin"For Peterbilt: Chassis list has been updated to include 1 chassis.
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The total chassis count is now 7. For Kenworth: Chassis list has been updated to include 1 chassis. The total chassis count is now 8."
Transmission
1 bulletinAn improved transmission bracket is now available for replacement on certain chassis equipped with a PACCAR TX-12...
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transmission, featuring a more durable design for enhanced long-term performance.
Body & Paint
1 bulletinIncorrect air filters may be inadvertently installed in certain chassis equipped with under-hood Donaldson air filter...
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housings.