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Service bulletins for the 2025 Mack Pioneer

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.

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

By type

By component

By trouble code

Bulletins, newest first
CBR 2496-14 2026052026-06-02. Service bulletin. ELECTRICAL SYSTEM. CBR to address when you should update to 3.0 service pack software update.
CBR 2465-6 2026052026-06-02. Service bulletin. ELECTRICAL SYSTEM; ENGINE. CBR to diagnosis issues with the Proactive Engine Restart system and Hood Open message.
CBR 2456-6 2026052026-06-02. Service bulletin. ELECTRICAL SYSTEM. Infotainment Update for Missing Apps, Navigation, and Apple/Android CarPlay Issues
GDC26-001 2026042026-05-05. Over-the-air update. POWER TRAIN. GDC - Transmission Oil Level Sensor
CBR 2574 2026042026-05-05. Service bulletin. WHEELS. CBR - Manual TPMS Wheel Sensor Calibration.
CBR 2573-1 2026042026-05-05. Service bulletin. POWER TRAIN. CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers.
CBR 2569-3 2026042026-05-05. Service bulletin. SERVICE BRAKES. CBR - Brake Pad Wear Indicator DTC C107E68.
CBR 2568-3 2026042026-05-05. Service bulletin. ELECTRICAL SYSTEM. CBR - Communication Lost With Ultracapacitor Message With Associated CCIOM DTC U100687 and a Startability Issue.
CBR 2562-15 2026042026-05-05. Service bulletin. ELECTRICAL SYSTEM. CBR - Electric Pneumatic Module (EPM) Fault
CBR 2540-7 2026042026-05-05. Service bulletin. SEAT BELTS; STRUCTURE:BODY; UNKNOWN OR OTHER. CBR - Upper Bunk Restraint System – Plastic Gable Retention Field Fix.
CBR 2441-8 2026 2026042026-05-04. Service bulletin. UNKNOWN OR OTHER; ELECTRICAL SYSTEM. CBR - Key Fob Calibration and/or Replacement.
CBR 2362-3 2026042026-05-04. Service bulletin. POWER TRAIN. CBR - Mack Carrier Nut Adhesive Change.
S4866 0320262026-04-02. Service campaign. STRUCTURE:BODY. SC - Load Lock Clamp Install
S4808 0320262026-04-02. Service campaign. STRUCTURE:BODY. SC - Certain model PR’s could experience grille surround trim detaching due to insufficient retention.
CBR 2570-1 0320262026-04-02. Service bulletin. ELECTRICAL SYSTEM; SERVICE BRAKES. CBR - EBS - Electro-Pneumatic Module - Signal Compare Failure DTC C109562 - AN (4) - PR.
CBR 2565-1 0320262026-04-02. Service bulletin. ELECTRICAL SYSTEM. CBR - Trailer, 12Volt Right/Left Direction Indicator Circuit Warning - AN (4) - PR.
CBR 2564-1 0320262026-04-02. Service bulletin. LANE DEPARTURE: BLIND SPOT DETECTION; VEHICLE SPEED CONTROL. CBR - Check Radar Pop Up Message.
CBR 2712-7 0320262026-04-02. Service bulletin. ELECTRICAL SYSTEM; UNKNOWN OR OTHER. CBR - No Start Condition After Over the Air Programing.
S4757 0220262026-03-03. Service campaign. ENGINE. SC - Certain model AN(4)’s and PR’s could experience DEF leaks or crystallization due to the installation of incorrect fasteners for the Urea Dosage Valve.
CBR 2514 0220262026-03-03. Service bulletin. ELECTRICAL SYSTEM. CBR - This procedure provides a temporary corrective action for the “Lost Communication to Alternator” message and Vehicle Master Control Unit (VMCU) DTC C103508 caused by a software issue.
SC S4742 2026012026-02-03. Service campaign. ENGINE. CBR MCO/VECI Label Reprint.
CBR 2548-1 2026012026-02-03. Service bulletin. SUSPENSION. CBR - Shock Interference With “Z” Springs.
CBR 2545-1 2026012026-02-03. Service bulletin. ELECTRICAL SYSTEM. CBR - U114688 VMCU Communication Fault - AN (4) - PR (4).
CBR 2540-5 2026012026-02-03. Service bulletin. UNKNOWN OR OTHER; STRUCTURE:BODY. CBR - Upper Bunk Restraint System – Plastic Gable Retention Field Fix.
CBR 2522-5 2026012026-02-03. Service bulletin. ENGINE. CBR - Frequent Parked Regeneration Requests - Models PR (4), AN (4).

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