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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

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
CBR 2502 0920252025-10-01. Service bulletin. ELECTRICAL SYSTEM. This CBR solution provides guidelines for ensuring the correct position of battery sensor modules and battery sensor harnesses on the Mack PR (4) and AN (4) chassis, as well as the Battery Sensor Diagnostic and Calibration Procedure.
CBR 2497 0920252025-10-01. Service bulletin. ELECTRICAL SYSTEM. Electronic control units on the VN(4), PR (4) and AN (4) contain information that is critical for vehicle functionality, maintaining vehicle life data, and maintaining vehicle compliance. Because of this, swapping ECUs from truck to truck even for diagnostic purposes may cause functional or compliance complications that may or may not be apparent.
CBR 2496 0920252025-10-01. Service bulletin. ELECTRICAL SYSTEM. The purpose of this CBR is outline the interim software solution for PR(4) andAN(4). Note that this document is subject to updates and currently covers Service Pack updates to B2_T2_1.2.
CBR 2482 0920252025-10-01. Service bulletin. ELECTRICAL SYSTEM. Purpose of this CBR is to address Pop up message for PTO Malfunction when there is no PTO Installed.
CBR 2465 0920252025-10-01. Service bulletin. ELECTRICAL SYSTEM. This CBR pertains to two issues that may arise with the Proactive Engine Restart (Remote Engine Start System).
CBR 2491-1 0820252025-09-02. Service bulletin. ELECTRICAL SYSTEM. CBR - The purpose of this CBR is to provide instructions when fault code U300056: Electronic Control Unit, Invalid/Incompatible Configuration for the RCIOM is active.
CBR 2172-5 0820252025-09-02. Service bulletin. ELECTRICAL SYSTEM. CBR - When an OTA (Over-The-Air) job starts to program the VECU blocks the starter relay out, if the job ends in a Critical failure, the vehicle will remain in Safe State.
CBR 407 0720252025-08-04. Service bulletin. SERVICE BRAKES; ELECTRICAL SYSTEM. CBR - To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP file will need to downloaded.
CBR 2488 0720252025-08-04. Service bulletin. ELECTRICAL SYSTEM. CBR - A significant GPS reporting issue is affecting fleet operations, with trucks maintaining back-office communication but failing to transmit GPS location data.
CBR 2483 0720252025-08-04. Service bulletin. ELECTRICAL SYSTEM. CBR - This CBR solution outlines the diagnosis and resolution of a DL6 CAN bus resistance issue, where a 40-ohmreading causes ELD communication failure, corrected by disconnecting the SCIM A262.D connector.
CBR -2467-4 0720252025-08-04. Service bulletin. ELECTRICAL SYSTEM. CBR - This CBR solution was created to􀁡provide guidance on resolving the “Service Required” message that may appear in the Instrument Cluster (IC) of VN (4) and PR (4) model vehicles under specific conditions.
CBR 2465-2 0720252025-08-04. Service bulletin. ELECTRICAL SYSTEM; UNKNOWN OR OTHER. CBR - This CBR pertains to two issues that may arise with the Proactive Engine Restart (Remote Engine Start System).
CBR 2443 0720252025-08-04. Service bulletin. ELECTRICAL SYSTEM; SERVICE BRAKES. CBR - The truck’s trailer detection system uses a brief pulse of compressed air through the red trailer supply line to detect a connected trailer, but this pulse can inadvertently re-lock air-actuated tandem slide systems; this procedure outlines a method to mitigate the issue while sliding the trailer tandems.
CBR 2429-3 0720252025-08-04. Service bulletin. ELECTRICAL SYSTEM. CBR - This CBR solution outlines the procedures for diagnosing, replacing, calibrating, and programming Flexible Switch Panels and the Security and Cab Interface Module (SCIM) to resolve switch malfunction notifications and associated fault codes.
CBR 2396 0720252025-08-04. Service bulletin. ELECTRICAL SYSTEM; UNKNOWN OR OTHER. CBR - For newly delivered vehicles it may be found that the key fob will not unlock the door. The message "Pre-delivery Mode" maybe displayed on the instrument cluster.
CBR 2472-2 2025052025-06-02. Service bulletin. ELECTRICAL SYSTEM. The purpose of this CBR is to provide instructions when trying to retrieve DTC and a Communication Failed Popup occurs.
CBR 2468-2 2025052025-06-02. Service bulletin. ELECTRICAL SYSTEM. The purpose of this CBR is to help diagnosis an electrically faulty door latch.
CBR-2452 2025032025-04-02. Service bulletin. ELECTRICAL SYSTEM. If the vehicle door is open and the truck is in neutral, a popup message may appear on the Driver Information Display (DID) instructing the operator to shift into neutral. If this message appears while the vehicle is already in neutral, the Instrument Cluster (IC)requires a software update.
CBR-2376 2024092024-10-04. Service bulletin. ELECTRICAL SYSTEM. CBR: Drivers Information Display (DID) Inoperative/Goes Blank During Vehicle Operation
CBR-471 2024092024-10-03. Service bulletin. ELECTRICAL SYSTEM. CBR: The procedure to eliminate the Mack Chassis "Air Restriction Light On" seen in the cluster is to confirm that the parameter YYT is set to "Enable" with Premium Tech Tool.
CBR-2356 2024072024-08-01. Service bulletin. ELECTRICAL SYSTEM. CBR: Drivers Information Display (DID)Inoperative After Cluster Replacement And Programming
CBR-2350 2024072024-08-01. Service bulletin. ELECTRICAL SYSTEM. CBR: Telematics Gateway (TGW) Connect Ability Issues
CBR-2383 2024062024-07-03. Service bulletin. UNKNOWN OR OTHER; ELECTRICAL SYSTEM; VEHICLE SPEED CONTROL. CBR - Accelerator Pedal: Inspection Instructions
CBR-2376 2024062024-07-03. Service bulletin. ELECTRICAL SYSTEM. CBR - Drivers Information Display (DID) Inoperative/Goes Blank During Vehicle Operation
CBR-2356 2024062024-07-03. Service bulletin. ELECTRICAL SYSTEM. CBR - Drivers Information Display (DID) Inoperative After Cluster Replacement And Programming

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