TSB M257005 202608
Service Bulletin/Repair Instructions
Loose CCV mounting bolts and oil leak at CCV due to cracking of the housing. Mounting hardware found to be under-torqued after the vehicle was delivered.
Vehicle report
2026 MACK PIONEER PR (4)
Service bulletins
95 bulletinsTechnical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
CBR 2599 202608
Service Bulletin/Repair Instructions
The purpose of this CBR is to provide support for complaints of trailer braking aggressively.
CBR 2598 202608
Service Bulletin/Repair Instructions
The purpose of this CBR is to provide steps on how to utilize the injector widget (within workshop toolbox) to aid with injection system issues.
CBR 2597 202608
Service Bulletin/Repair Instructions
The purpose of this CBR is to provide steps on how to correct a customer complaint of "Service Required" message for air filter replacement appears in the cluster. There may be no option in PTT or the cluster to reset the air filter service interval.
CBR 2429 202608
Service Bulletin/Repair Instructions
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 2596 202608
Service Bulletin/Repair Instructions
The purpose of this CBR is to provide steps on how to correct a customer complaint of a no crank/engine start condition.
TSB M-590-001 072026
Service Bulletin/Repair Instructions
TSB - Wheel Speed Sensor Fitting And Cable Clamping.
CBR 2585-3 072026
Service Bulletin/Repair Instructions
CBR - The purpose of this CBR is to provide support for fault codes C106718 and/or C106818.
CBR 2545-3 072026
Service Bulletin/Repair Instructions
CBR - The purpose of this CBR is to provide guidance on fault code U114688.
CBR-2590-2 202606
Service Bulletin/Repair Instructions
The purpose of this CBR is to provide steps on how to correct a customer complaint of instrument cluster going dark (blackout) situation.
CBR-2591-1 202606
Service Bulletin/Repair Instructions
The purpose of this CBR it to provide release notes for the recent Engine ECU software.
CBR-2496-16 202606
Service Bulletin/Repair Instructions
The purpose of this CBR is outline the interim software solution for PR(4) and AN(4).
CBR-2568-5 202606
Service Bulletin/Repair Instructions
Contact Workshop; Communication Lost With Ultracapacitor Message With Associated CCIOM DTC U100687 And A Startability Issue.
CBR-2587-2 202606
Service Bulletin/Repair Instructions
The purpose of this cbr is to provide steps on how to protect the alternator power cable connection from corrosion.
CBR-2586-1 202606
Service Bulletin/Repair Instructions
The purpose of this CBR is to address issues of exhaust stack rotation on version 4 products.
CBR 2456-6 202605
Service Bulletin/Repair Instructions
Infotainment Update for Missing Apps, Navigation, and Apple/Android CarPlay Issues
CBR-2465-7 202606
Service Bulletin/Repair Instructions
The purpose of this CBR is to help diagnosis issues with the Proactive Engine Restart system and Hood Open popup message.
CBR-2588-2 202606
Service Bulletin/Repair Instructions
The purpose of this CBR is to provide aid in VMCU fault B1524-49 along with a Rain sensor which will not calibrate.
CBR 2465-6 202605
Service Bulletin/Repair Instructions
CBR to diagnosis issues with the Proactive Engine Restart system and Hood Open message.
GDC26-02 202605
Service Bulletin/Repair Instructions
Fault diagnostic information for Supplemental Restraint / Airbag Inflation System (SRS)
CBR 2587-1 202605
Service Bulletin/Repair Instructions
CBR to provide steps on how to protect the alternator power cable connection from corrosion.
CBR 2583-1 202605
Service Bulletin/Repair Instructions
Tire Pressure Monitoring System U101A / U101B Fault Solution
CBR 2496-14 202605
Service Bulletin/Repair Instructions
CBR to address when you should update to 3.0 service pack software update.
CBR 2585-1 202605
Service Bulletin/Repair Instructions
CBR to provide support for fault codes C106718 and/or C106818.
CBR 2584-4 202605
Service Bulletin/Repair Instructions
Electronically controlled suspension (ECS) calibration procedure.
CBR 2502-7 202605
Service Bulletin/Repair Instructions
Mack Chassis - Battery Sensor Diagnostic, Calibration, and Configuration Procedure
CBR 2441-8 2026 202604
Service Bulletin/Repair Instructions
CBR - Key Fob Calibration and/or Replacement.
CBR 2568-3 202604
Service Bulletin/Repair Instructions
CBR - Communication Lost With Ultracapacitor Message With Associated CCIOM DTC U100687 and a Startability Issue.
GDC26-001 202604
Over The Air
GDC - Transmission Oil Level Sensor
CBR 2574 202604
Service Bulletin/Repair Instructions
CBR - Manual TPMS Wheel Sensor Calibration.
CBR 2562-15 202604
Service Bulletin/Repair Instructions
CBR - Electric Pneumatic Module (EPM) Fault
CBR 2569-3 202604
Service Bulletin/Repair Instructions
CBR - Brake Pad Wear Indicator DTC C107E68.
CBR 2540-7 202604
Service Bulletin/Repair Instructions
CBR - Upper Bunk Restraint System – Plastic Gable Retention Field Fix.
CBR 2362-3 202604
Service Bulletin/Repair Instructions
CBR - Mack Carrier Nut Adhesive Change.
CBR 2573-1 202604
Service Bulletin/Repair Instructions
CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers.
CBR 2570-1 032026
Service Bulletin/Repair Instructions
CBR - EBS - Electro-Pneumatic Module - Signal Compare Failure DTC C109562 - AN (4) - PR.
CBR 2712-7 032026
Service Bulletin/Repair Instructions
CBR - No Start Condition After Over the Air Programing.
CBR 2564-1 032026
Service Bulletin/Repair Instructions
CBR - Check Radar Pop Up Message.
CBR 2565-1 032026
Service Bulletin/Repair Instructions
CBR - Trailer, 12Volt Right/Left Direction Indicator Circuit Warning - AN (4) - PR.
S4808 032026
Service Campaign
SC - Certain model PR’s could experience grille surround trim detaching due to insufficient retention.
CBR 2514 022026
Service Bulletin/Repair Instructions
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.
S4757 022026
Service Campaign
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 2522-5 202601
Service Bulletin/Repair Instructions
CBR - Frequent Parked Regeneration Requests - Models PR (4), AN (4).
CBR 2443-3 202601
Service Bulletin/Repair Instructions
CBR - Trailer Tandem Adjustment Procedure - PR (4) - AN (4).
CBR 2496-9 202601
Service Bulletin/Repair Instructions
CBR - The purpose of this CBR is outline the interim software solution for PR(4) and AN(4).
CBR 2548-1 202601
Service Bulletin/Repair Instructions
CBR - Shock Interference With “Z” Springs.
CBR 2540-5 202601
Service Bulletin/Repair Instructions
CBR - Upper Bunk Restraint System – Plastic Gable Retention Field Fix.
CBR 2408-16 202601
Service Bulletin/Repair Instructions
CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow - PR (4).
CBR 2545-1 202601
Service Bulletin/Repair Instructions
CBR - U114688 VMCU Communication Fault - AN (4) - PR (4).
CBR 2502-2 202601
Service Bulletin/Repair Instructions
CBR - Mack Chassis - Battery Sensor Diagnostic and Calibration Procedure - PR (4) - AN (4).
CBR 2516-6 202601
Service Bulletin/Repair Instructions
CBR - CMS Black Screen Troubleshooting - PR (4) - AN (4).
SC S4742 202601
Service Campaign
CBR MCO/VECI Label Reprint.
SC S4751 202601
Service Campaign
CBR - Driver Environment Control Module Replacement.
CBR 2540 202512
Service Bulletin/Repair Instructions
Upper Bunk Restraint System – Plastic Gable Retention Field Fix
CBR 2542 202512
Service Bulletin/Repair Instructions
This document provides mandatory interim parameter settings to ensure proper vehicle operation.
CBR 2526 202512
Service Bulletin/Repair Instructions
The purpose of this CBR is to address driver complaint of parking heater inoperative.
CBR 2535 202512
Service Bulletin/Repair Instructions
The purpose of this CBR is to address reports of regeneration failure when ambient temperature is below 30F.
CBR 2532-1 202511
Service Bulletin/Repair Instructions
CBR - Automatic High Beam PR(4) - AN(4).
CBR 2016-18 202511
Service Bulletin/Repair Instructions
CBR - Frame or Cab Lean.
CBR - 2528-1 202511
Service Bulletin/Repair Instructions
CBR - Mack Chassis - PR (4) - Pioneer Bug Screen Hitting Bumper.
CBR 2514-2 202511
Service Bulletin/Repair Instructions
CBR - Lost Communication to Alternator Message - DTC C103508.
CBR 2518-2 202511
Service Bulletin/Repair Instructions
CBR - Load Lock Clamp Breaking - PR(4).
CBR 2526-4 202511
Service Bulletin/Repair Instructions
CBR - Parking Heater Inoperative - PR(4) - AN (4).
CBR 2408-15 202511
Service Bulletin/Repair Instructions
CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow PR(4).
CBR 2525-2 202511
Service Bulletin/Repair Instructions
CBR - Exhaust Leak or Noise – Turbo Compound (TC) Bolt Inspection and Repair - PR (4).
CBR 2527-1 202511
Service Bulletin/Repair Instructions
CBR - Center Chassis Input Output Module(CCIOM) Fault Code U3000-94 - PR(4)
CBR 2467-5 202511
Service Bulletin/Repair Instructions
CBR - Service Required Message PR(4), AN(4).
CBR 2521-1 202511
Service Bulletin/Repair Instructions
CBR - Xantrex Inverter Sub-hardware Mismatch.
CBR 2516-3 102025
Service Bulletin/Repair Instructions
CBR - CMS Black Screen Troubleshooting.
CBR 2480-7
Service Bulletin/Repair Instructions
CBR - Resolution Process for Locked Control Unit(s)
CBR 2514-1 102025
Service Bulletin/Repair Instructions
CBR - Lost Communication to Alternator Message.
CBR 2511-1 102025
Service Bulletin/Repair Instructions
CBR - Inverter Low/No Power Shutoff Bypass
GDC25-001 092025
Service Bulletin/Repair Instructions
Particulate Filter Restriction - Soot Accumulation Bank 1
GDC25-002 092025
Service Bulletin/Repair Instructions
Low Fuel Pressure
GDC25-003 092025
Service Bulletin/Repair Instructions
Reductant Return: No Flow Detected
GDC25-004 092025
Service Bulletin/Repair Instructions
Reductant Pressure Sensor - Circuit Open
GDC25-005 092025
Service Bulletin/Repair Instructions
Exhaust Gas Temperature Sensor Circuit Short to Battery or Open
GDC25-006 092025
Service Bulletin/Repair Instructions
Engine Oil Over Temperature
GDC25-007 092025
Service Bulletin/Repair Instructions
Reductant Injection Valve Control Bank 1 Unit 1 - Circuit Open
GDC25-008 092025
Service Bulletin/Repair Instructions
Engine Coolant Over Temperature
GDC25-009 092025
Service Bulletin/Repair Instructions
Engine Oil Pressure Too Low
GDC25-010 092025
Service Bulletin/Repair Instructions
Engine Coolant Level Low - Elevated Coolant & Oil Temperature
GDC25-011 092025
Service Bulletin/Repair Instructions
Adaptive Cruise Control Issue
GDC25-012 092025
Service Bulletin/Repair Instructions
Lighting DTC list
CBR 2504 092025
Service Bulletin/Repair Instructions
Some vehicles may have reverse cameras not properly assigned from the factory.
CBR 2505 092025
Service Bulletin/Repair Instructions
The purpose of this CBR is to address the issue with Eco Roll disable switch notworking.
CBR 2503 092025
Service Bulletin/Repair Instructions
The purpose of this CBR is to outline the steps for adjusting brake pedal freeplay following Foot Brake Modulator (FBM) replacement or when diagnostic code C10C3-77is present.
CBR 2500 092025
Service Bulletin/Repair Instructions
This procedure describes the standardized method for repairing failed inserts pulled out of a table surface. It applies only when the receiving hole is not significantly damaged. Acceptable conditions include surface fraying or peeling at the painted layer only, with no full-depth cracking.
CBR 2502 092025
Service Bulletin/Repair Instructions
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 092025
Service Bulletin/Repair Instructions
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 2408 092025
Service Bulletin/Repair Instructions
This document provides guidance for addressing the APM DTC C10129B fault," High/Excessive Flow" This fault was introduced by a previous APM software package and requires specific containment actions.
CBR 2482 092025
Service Bulletin/Repair Instructions
Purpose of this CBR is to address Pop up message for PTO Malfunction when there is no PTO Installed.
CBR 2465 092025
Service Bulletin/Repair Instructions
This CBR pertains to two issues that may arise with the Proactive Engine Restart (Remote Engine Start System).
CBR 2172-5 082025
Service Bulletin/Repair Instructions
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 2491-1 082025
Service Bulletin/Repair Instructions
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.
Reading this report
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.