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Service bulletins for the 2026 Peterbilt 548

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

18 on file from NHTSA, as of 2026-10-19.

By type

By component

Bulletins, newest first
42-0702026-10-17. Service bulletin. UNKNOWN OR OTHER. Due to supplier constraints, an authorized aftermarket surge tank has been made available.
P0012026-09-29. Service bulletin. ENGINE. "Kenworth: Dealers should check the chassis list and SIR weekly for VIN changes. 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."
24KWC/24PBC2026-08-20. Service bulletin. STEERING. Updated Sheppard Steering Gear Classification Tool link in Inspection Procedure
14-0372026-08-20. Service campaign. UNKNOWN OR OTHER. An improved transmission bracket is now available for replacement on certain chassis equipped with a PACCAR TX-12 transmission, featuring a more durable design for enhanced long-term performance.
T0242026-06-17. Service bulletin. POWER TRAIN. "KW & PB: New software is available for download. The DAVIE4 cache must be cleared before attempting to reprogram a chassis that is experiencing problems to ensure the latest version of software is installed. Follow all steps in the attached procedures before submitting a TCS case."
T-0242026-06-17. Service bulletin. POWER TRAIN. The repair procedure has been updated to include diagnostic steps.
T0242026-06-03. Service bulletin. POWER TRAIN. KW: A Transmission Control Module (TCM) software update is now available for certain T280, T380, T480, T680, T880, and W990 chassis with PACCAR TX-12 and TX-18 transmissions, TCM software version R5.5 or later and an AT5 controller, where the TASPS fails. PB: A Transmission Control Module (TCM) software update is now available for certain Model 537, 548, 567, 579, and 589 chassis with PACCAR TX-12 and TX-18 transmissions, TCM software version R5.5 or later and an AT5 controller, where the TASPS fails.
02-1772026-06-03. Service bulletin. ELECTRICAL SYSTEM. Troubleshooting procedures for 2.1m cab power windows are now available.
14-0342026-05-06. Service bulletin. UNKNOWN OR OTHER. Bogie Crossmember Torque Value Update - Procedure has been updated to correct torque values.
45-0692026-03-05. Service bulletin. ENGINE. Cummins TSB 210203 has been updated to remove the PACCAR suction side fuel filter part number from Table 1 as the filter is no longer compatible.
25PACF2026-01-06. Service bulletin. EXTERIOR LIGHTING. Parts and procedures are now available for all affected chassis equipped with Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013 / Q21-1157-002-002 / Q21-1157-004-004 / Q21-1157-006-006 / Q21-1157-009-009. See attached Parts Matrix for required parts per chassis.
25KWB/25PBB2026-01-06. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. A new Recommended Repair has been added. It must be used if safety recall 25PACF is performed prior to or at the same time as this repair since the 25PACF remedy also satisfies this safety recall.
25PBE2025-09-03. Service campaign. SERVICE BRAKES. Parts and repair procedures are now available. Certain chassis may have a rear suspension tracking rod that interferes with the left rear brake valve components during full suspension travel. This interference could cause a loss of the rear service brake or ABS modulation for one rear axle wheel end, increasing the risk of a crash.
25PACF2025-09-03. Service campaign. EXTERIOR LIGHTING. Procedures are now available for Phase 1 chassis equipped with Internal Combustion Engines (ICE) and Vehicle Electronic Control Unit (VECU) part number Q21-1157-013-011 / Q21-1157-013-013. Parts and procedures for Phase 2 chassis will be available at a later date. This bulletin will be updated at that time. Please refer to the condition section for more details. Certain Ethernet Multiplexed Architecture (EMUX) chassis fail to conform to Federal and Canada Motor Vehicle Safety Standards (FMVSS/CMVSS) No. 108. Delayed or unsteady illumination of the vehicle’s stop lamps, reverse lamps, turn signal lamps and inadvertent change in headlamp illumination or lift axle position may"
25PBE2025-08-05. Service bulletin. SUSPENSION. Safety Recall – Interim Notifi cation Interim bulletin chassis are now fl agged in the PACCAR Registration and Warranty System. Refer to Bulletin 99-048
25PBB2025-04-04. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING. Safety Recall The Exterior Lighting Switch (ELS) in certain Model 535, 536, 537, 548, and 567 chassis may not function and can be reset only by a key cycle. This issue may result in non-compliance with FMVSS/CMVSS 101 and 108. Affected chassis must have the Vehicle Soft ware updated.
T020 - PB2025-04-04. Service bulletin. POWER TRAIN. Fix-As-Fail Certain Model 535, 536, 537, and 548 chassis equipped with a PACCAR TX-8 transmission received transmission software with an incorrect variable. This software issue may cause DTC 521215-2 to set, the Transmission Dash Light to Illuminate, and shifting to be restricted. A software update is now available to fix the issue. Fix-as-Fail start date: 03/19/2025.
25PBB2025-03-04. Other. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. "Safety Recall – Interim Notification The Exterior Lighting Switch (ELS) in certain Model 535, 536, 537, 548, and 567 chassis may not function and can be reset only by a key cycle. This issue may result in non-compliance with US Federal Motor Vehicle Safety Standards (FMVSS) or Canadian Motor Vehicle Safety Standards (CMVSS) 101 and 108. This bulletin will be updated when software and programming procedures are available."

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.