2026 Mack Pioneer PR (4) TSBs
100 Technical Service Bulletins across 16 categories
Categories
Other
27 bulletinsInstrument Cluster Going Dark
Diagnostic instructions for CAN network communication issues.
The purpose of this CBR is to provide steps on how to utilize the injector widget (within workshop toolbox) to aid with...
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injection system issues.
CBR - The purpose of this CBR is to provide support for fault codes C106718 and/or C106818.
CBR - The purpose of this CBR is to provide guidance on fault code U114688.
The purpose of this CBR is to provide steps on how to correct a customer complaint of instrument cluster going dark...
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(blackout) situation.
Contact Workshop; Communication Lost With Ultracapacitor Message With Associated CCIOM DTC U100687 And A Startability...
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Issue.
CBR to provide support for fault codes C106718 and/or C106818.
CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers.
CBR - Communication Lost With Ultracapacitor Message With Associated CCIOM DTC U100687 and a Startability Issue.
CBR - Mack Carrier Nut Adhesive Change.
CBR - Check Radar Pop Up Message.
CBR - No Start Condition After Over the Air Programing.
CBR MCO/VECI Label Reprint.
CBR - U114688 VMCU Communication Fault - AN (4) - PR (4).
CBR - Trailer Tandem Adjustment Procedure - PR (4) - AN (4).
CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow - PR (4).
CBR - Automatic High Beam PR(4) - AN(4).
CBR - Air Production Modulator (APM) DTC C10129B - High/Excessive Flow PR(4).
CBR - Frame or Cab Lean.
CBR - Resolution Process for Locked Control Unit(s)
The purpose of this CBR is to address the issue with Eco Roll disable switch notworking.
Some vehicles may have reverse cameras not properly assigned from the factory.
Adaptive Cruise Control Issue
Reductant Return: No Flow Detected
Particulate Filter Restriction - Soot Accumulation Bank 1
CBR - The purpose of this CBR is to provide instructions when fault code U300056: Electronic Control Unit,...
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Invalid/Incompatible Configuration for the RCIOM is active.
Electrical
23 bulletinsJumper Harness Repair for Version 4 Mack Trucks
Power Cable Alternator Replacement
This CBR solution outlines the procedures for diagnosing, replacing, calibrating, and programming Flexible Switch Panels...
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and the Security and Cab Interface Module (SCIM) to resolve switch malfunction notifications and associated fault codes.
TSB - Wheel Speed Sensor Fitting And Cable Clamping.
The purpose of this CBR is to provide aid in VMCU fault B1524-49 along with a Rain sensor which will not calibrate.
The purpose of this cbr is to provide steps on how to protect the alternator power cable connection from corrosion.
CBR to provide steps on how to protect the alternator power cable connection from corrosion.
Mack Chassis - Battery Sensor Diagnostic, Calibration, and Configuration Procedure
CBR - Manual TPMS Wheel Sensor Calibration.
CBR - Electric Pneumatic Module (EPM) Fault
CBR - EBS - Electro-Pneumatic Module - Signal Compare Failure DTC C109562 - AN (4) - PR.
CBR - Trailer, 12Volt Right/Left Direction Indicator Circuit Warning - AN (4) - PR.
CBR - This procedure provides a temporary corrective action for the Lost Communication to Alternator message and Vehicle...
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Master Control Unit (VMCU) DTC C103508 caused by a software issue.
CBR - Driver Environment Control Module Replacement.
CBR - Mack Chassis - Battery Sensor Diagnostic and Calibration Procedure - PR (4) - AN (4).
CBR - Center Chassis Input Output Module(CCIOM) Fault Code U3000-94 - PR(4)
CBR - Lost Communication to Alternator Message - DTC C103508.
CBR - Lost Communication to Alternator Message.
This CBR solution provides guidelines for ensuring the correct position of battery sensor modules and battery sensor...
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harnesses on the Mack PR (4) and AN (4) chassis, as well as the Battery Sensor Diagnostic and Calibration Procedure.
Electronic control units on the VN(4), PR (4) and AN (4) contain information that is critical for vehicle functionality,...
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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.
Exhaust Gas Temperature Sensor Circuit Short to Battery or Open
Reductant Pressure Sensor - Circuit Open
CBR - When an OTA (Over-The-Air) job starts to program the VECU blocks the starter relay out, if the job ends in a...
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Critical failure, the vehicle will remain in Safe State.
Engine
13 bulletinsLoose CCV mounting bolts and oil leak at CCV due to cracking of the housing.
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Mounting hardware found to be under-torqued after the vehicle was delivered.
The purpose of this CBR is to provide steps on how to correct a customer complaint of a no crank/engine start condition.
The purpose of this CBR it to provide release notes for the recent Engine ECU software.
The purpose of this CBR is to help diagnosis issues with the Proactive Engine Restart system and Hood Open popup...
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message.
CBR to diagnosis issues with the Proactive Engine Restart system and Hood Open message.
SC - Certain model AN(4)s and PRs could experience DEF leaks or crystallization due to the installation of incorrect...
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fasteners for the Urea Dosage Valve.
CBR - Exhaust Leak or Noise Turbo Compound (TC) Bolt Inspection and Repair - PR (4).
This CBR pertains to two issues that may arise with the Proactive Engine Restart (Remote Engine Start System).
Engine Coolant Level Low - Elevated Coolant & Oil Temperature
Engine Oil Pressure Too Low
Engine Coolant Over Temperature
Reductant Injection Valve Control Bank 1 Unit 1 - Circuit Open
Engine Oil Over Temperature
Tires & Wheels
5 bulletinsThe purpose of this CBR is outline the interim software solution for PR(4) and AN(4).
The purpose of this CBR is outline the interim software solution for PR(4) and AN(4).
Tire Pressure Monitoring System U101A / U101B Fault Solution
CBR - The purpose of this CBR is outline the interim software solution for PR(4) and AN(4).
This document provides mandatory interim parameter settings to ensure proper vehicle operation.
Air Bags & Safety
4 bulletinsFault diagnostic information for Supplemental Restraint / Airbag Inflation System (SRS)
CBR - Upper Bunk Restraint System Plastic Gable Retention Field Fix.
CBR - Upper Bunk Restraint System Plastic Gable Retention Field Fix.
Upper Bunk Restraint System Plastic Gable Retention Field Fix
Infotainment
4 bulletinsInfotainment Update for Missing Apps, Navigation, and Apple/Android CarPlay Issues
CBR - CMS Black Screen Troubleshooting - PR (4) - AN (4).
CBR - Mack Chassis - PR (4) - Pioneer Bug Screen Hitting Bumper.
CBR - CMS Black Screen Troubleshooting.
Hybrid & EV
4 bulletinsCBR - Frequent Parked Regeneration Requests - Models PR (4), AN (4).
The purpose of this CBR is to address reports of regeneration failure when ambient temperature is below 30F.
CBR - Xantrex Inverter Sub-hardware Mismatch.
CBR - Inverter Low/No Power Shutoff Bypass
Brakes
3 bulletinsThe purpose of this CBR is to provide support for complaints of trailer braking aggressively.
CBR - Brake Pad Wear Indicator DTC C107E68.
The purpose of this CBR is to outline the steps for adjusting brake pedal freeplay following Foot Brake Modulator (FBM)...
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replacement or when diagnostic code C10C3-77is present.
Software & Calibration
3 bulletinsCBR to address when you should update to 3.0 service pack software update.
CBR - Key Fob Calibration and/or Replacement.
This document provides guidance for addressing the APM DTC C10129B fault," High/Excessive Flow" This fault was...
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introduced by a previous APM software package and requires specific containment actions.
Lighting
3 bulletinsCBR - Load Lock Clamp Breaking - PR(4).
Purpose of this CBR is to address Pop up message for PTO Malfunction when there is no PTO Installed.
Lighting DTC list
Pre-Delivery & Maintenance
2 bulletinsThe purpose of this CBR is to provide steps on how to correct a customer complaint of "Service Required" message for air...
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filter replacement appears in the cluster. There may be no option in PTT or the cluster to reset the air filter service interval.
CBR - Service Required Message PR(4), AN(4).
Fuel System
2 bulletinsThe purpose of this CBR is to address issues of exhaust stack rotation on version 4 products.
Low Fuel Pressure
Suspension
2 bulletinsElectronically controlled suspension (ECS) calibration procedure.
CBR - Shock Interference With Z Springs.
Body & Paint
2 bulletinsSC - Certain model PRs could experience grille surround trim detaching due to insufficient retention.
This procedure describes the standardized method for repairing failed inserts pulled out of a table surface.
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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.
HVAC & Climate
2 bulletinsThe purpose of this CBR is to address driver complaint of parking heater inoperative.
CBR - Parking Heater Inoperative - PR(4) - AN (4).
Transmission
1 bulletinGDC - Transmission Oil Level Sensor