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Service bulletins for the 2026 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.

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

By type

By component

By trouble code

By topic

Bulletins, newest first
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).
CBR 2516-6 2026012026-02-03. Service bulletin. VEHICLE SPEED CONTROL; ELECTRICAL SYSTEM. CBR - CMS Black Screen Troubleshooting - PR (4) - AN (4).
CBR 2502-2 2026012026-02-03. Service bulletin. ELECTRICAL SYSTEM. CBR - Mack Chassis - Battery Sensor Diagnostic and Calibration Procedure - PR (4) - AN (4).
CBR 2496-9 2026012026-02-03. Service bulletin. ELECTRICAL SYSTEM. CBR - The purpose of this CBR is outline the interim software solution for PR(4) and AN(4).
CBR 2443-3 2026012026-02-03. Service bulletin. ELECTRICAL SYSTEM; SERVICE BRAKES. CBR - Trailer Tandem Adjustment Procedure - PR (4) - AN (4).
CBR 2408-16 2026012026-02-03. Service bulletin. ELECTRICAL SYSTEM. CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow - PR (4).
CBR 2542 2025122026-01-06. Service bulletin. ELECTRICAL SYSTEM. This document provides mandatory interim parameter settings to ensure proper vehicle operation.
CBR 2540 2025122026-01-06. Service bulletin. STRUCTURE:BODY; UNKNOWN OR OTHER. Upper Bunk Restraint System – Plastic Gable Retention Field Fix
CBR 2535 2025122026-01-05. Service bulletin. ENGINE. The purpose of this CBR is to address reports of regeneration failure when ambient temperature is below 30F.
CBR 2526 2025122026-01-05. Service bulletin. ELECTRICAL SYSTEM. The purpose of this CBR is to address driver complaint of parking heater inoperative.
CBR 2532-1 2025112025-12-03. Service bulletin. EXTERIOR LIGHTING. CBR - Automatic High Beam PR(4) - AN(4).
CBR - 2528-1 2025112025-12-03. Service bulletin. UNKNOWN OR OTHER. CBR - Mack Chassis - PR (4) - Pioneer Bug Screen Hitting Bumper.
CBR 2527-1 2025112025-12-03. Service bulletin. ELECTRICAL SYSTEM. CBR - Center Chassis Input Output Module(CCIOM) Fault Code U3000-94 - PR(4)
CBR 2526-4 2025112025-12-03. Service bulletin. ELECTRICAL SYSTEM; ENGINE. CBR - Parking Heater Inoperative - PR(4) - AN (4).
CBR 2525-2 2025112025-12-03. Service bulletin. ENGINE. CBR - Exhaust Leak or Noise – Turbo Compound (TC) Bolt Inspection and Repair - PR (4).
CBR 2521-1 2025112025-12-03. Service bulletin. ELECTRICAL SYSTEM. CBR - Xantrex Inverter Sub-hardware Mismatch.
CBR 2518-2 2025112025-12-03. Service bulletin. UNKNOWN OR OTHER. CBR - Load Lock Clamp Breaking - PR(4).
CBR 2514-2 2025112025-12-03. Service bulletin. ELECTRICAL SYSTEM. CBR - Lost Communication to Alternator Message - DTC C103508.
CBR 2467-5 2025112025-12-03. Service bulletin. ELECTRICAL SYSTEM. CBR - Service Required Message PR(4), AN(4).
CBR 2408-15 2025112025-12-03. Service bulletin. ENGINE; ELECTRICAL SYSTEM. CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow PR(4).
CBR 2016-18 2025112025-12-03. Service bulletin. SUSPENSION; UNKNOWN OR OTHER. CBR - Frame or Cab Lean.
CBR 2480-72025-11-03. Service bulletin. ELECTRICAL SYSTEM. CBR - Resolution Process for Locked Control Unit(s)
CBR 2516-3 1020252025-11-03. Service bulletin. ELECTRICAL SYSTEM; VISIBILITY/WIPER; VEHICLE SPEED CONTROL. CBR - CMS Black Screen Troubleshooting.

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