The worst 2027 Peterbilt 579 problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
Recalls 4
Seat belts: rear/other: webbing
- What is wrong
- PACCAR Incorporated (PACCAR) is recalling certain 2027 Peterbilt 567, 579, 589, Kenworth T680, T880, W900, and W990 vehicles. The belt restraint webbing for the sleeper bunk was not secured properly during manufacturing.
- Risk
- A bunk restraint with improperly secured webbing may fail to adequately restrain vehicle occupants during a crash, increasing the risk of injury.
- Remedy
- Dealers will inspect and replace the bunk restraints, as necessary, free of charge. Owner notification letters are expected to be mailed December 13, 2026. Owners may contact Kenworth's customer service at 1‑425‑828‑5888 and Peterbilt's customer service at 1‑940‑591‑4220. PACCAR's number for this recall is 26PACH.
Recall number 26V674000 · Recall details
Seats: front assembly: seat heater/cooler
- What is wrong
- PACCAR Incorporated (PACCAR) is recalling certain 2027 Peterbilt 567, 579, 589 and 2027 Kenworth T680, T880, and W990 vehicles. The seat ventilation harness may be missing heat-shrink, resulting in a short circuit.
- Risk
- A short circuit increases the risk of a fire.
- Remedy
- Dealers will replace the harnesses, free of charge. Owner notification letters were mailed October 16, 2026. Owners may contact Peterbilt's customer service at 1‑940‑591‑4220 or Kenworth's customer service at 1‑425‑828‑5888. PACCAR's number for this recall is 26PACE.
Recall number 26V544000 · Recall details
Electrical system: wiring: power distribution module/ipdm
- What is wrong
- PACCAR Incorporated (PACCAR) is recalling certain 2027 Peterbilt and Kenworth vehicles. Please see the recall report for a complete list of models. The power distribution center (PDC) box may be contaminated with oil, which could result in a loss of drive power, Antilock Brake System (ABS) functionality, exterior lighting, windshield wipers, or the defogging system. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard numbers 103, "Windshield Defrosting and Defogging Systems," 104, "Windshield Wiping and Washing Systems," and 108, "Lamps, Reflective Devices, and Associated Equipment."
- Risk
- A loss of lighting, windshield wipers, ABS function, or a loss of drive power can increase the risk of a crash.
- Remedy
- Dealers will inspect the PDC serial numbers, and replace the PDC boxes as necessary, free of charge. Owner letters were mailed September 23, 2026. Owners may contact Peterbilt's customer service at 1‑940‑591‑4220 and Kenworth's customer service at 1‑425‑828‑5888. PACCAR's number for this recall is 26PACD.
Recall number 26V485000 · Recall details
Service brakes, air: supply: quick release valve
- What is wrong
- PACCAR Incorporated (PACCAR) is recalling certain 2026-2027 Peterbilt 579 and 2027 Kenworth T680 tractors. The trailer air connection quick release (QR) valve in the air brake system may have been incorrectly installed, which can cause the trailer to become unstable after the driver applies the brakes. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."
- Risk
- An incorrectly installed quick release valve that does not function properly can increase the risk of a crash.
- Remedy
- Paccar inspected and reinstalled the valves, as necessary, free of charge. All affected tractors have been repaired and therefore no owner notification letters are necessary. Owners may contact Peterbilt's customer service at 1‑940‑591‑4220 and Kenworth's customer service at 1‑425‑828‑5888. PACCAR's number for this recall is 26PACC.
Recall number 26V442000 · Recall details
Technical service bulletins for the 2027 Peterbilt 579 12
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- The new 2.1m day cab lift tools, a Level 3 mandatory tool, are now available to order.
- Certain Gra-Mag seats have an internal seat harness manufactured without heat-shrink on the resistor/diode...
- Additional chassis have been added to the population
- "The PKC Group power distribution center (PDC) in certain vehicles may be contaminated with oil, which...
- "Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes
- "(KW) Parts Shortage – Due to supplier constraints, certain T680 and T880 chassis were shipped without...
- An exhaust manifold slip joint seal kit is now available for EPA 2017-2024 PACCAR MX-13 engines.
- [SmartAir / KIMS] A/C systems may shut down prematurely when voltage levels drop below a certain threshold.
- "For Peterbilt: Chassis list has been updated to include 1 chassis
- An improved transmission bracket is now available for replacement on certain chassis equipped with a...
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Questions about the 2027 Peterbilt 579
Is the 2027 Peterbilt 579 reliable?
Owners have filed 0 complaints about the 2027 Peterbilt 579.
What is the most common problem with the 2027 Peterbilt 579?
There are not enough complaints to tell.
How many recalls does the 2027 Peterbilt 579 have?
4 recalls, covering seat belts, seats and electrical system.
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