2025 Mack Pioneer PR (4) TSBs
155 Technical Service Bulletins across 17 categories
Categories
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33 bulletinsInstrument Cluster Going Dark
Diagnostic instructions for CAN network communication issues.
CBR - The purpose of this CBR is to provide support for fault codes C106718 and/or C106818.
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 - Mack Chassis - PR (4) - AN (4) - B2_T2_2.0.
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.
CBR - To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP file will need to downloaded.
CBR - A significant GPS reporting issue is affecting fleet operations, with trucks maintaining back-office communication...
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but failing to transmit GPS location data.
CBR - This CBR solution outlines the diagnosis and resolution of a DL6 CAN bus resistance issue, where a 40-ohmreading...
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causes ELD communication failure, corrected by disconnecting the SCIM A262.D connector.
CBR - The trucks trailer detection system uses a brief pulse of compressed air through the red trailer supply line to...
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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 - One-Box SCR Weld Leaks.
CBR: To correct the MID136 SID 66 FMI 7 fault code the latest Bendix VCP fi le will need to be downloaded.
CBR: Telematics Gateway (TGW) Connect Ability Issues
Electrical
27 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 - 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.
CBR - This CBR solution outlines the procedures for diagnosing, replacing, calibrating, and programming Flexible Switch...
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Panels and the Security and Cab Interface Module (SCIM) to resolve switch malfunction notifications and associated fault codes.
CBR - This CBR solution outlines the analysis of temperature changes in sensors T1, T2, and T3 and provides a procedure...
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for inspecting and addressing potential sensor issues related to AHI fuel injection.
The purpose of this CBR is to help diagnosis an electrically faulty door latch.
Mack DEF Level (UQLS) Sensor Troubleshooting Guide - US17+OBD16 Emissions and Newer
Mack Trucks has determined that a select group of trucks were built with an AHI Module fuel pressure sensor which does...
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not meet our specifications.
Engine
27 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
CBR - This CBR pertains to two issues that may arise with the Proactive Engine Restart (Remote Engine Start System).
CBR - This CBR solution addresses crank no start and engine dying issues in some VN (4) and PR (4) models caused by an...
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incorrect fuel line configuration and/or fuel line fitting not seated correctly.
CBR - Mechanical components with moving parts designed for high-temperature environments such as the turbo wastegate...
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used on the 13L TC engines are susceptible to certain kinds of leakages due to their design requirements.
CBR - The purpose of this CBR is to assist in determining source(s) of suspect abnormal turbocharger noise.
Vehicles may present with oil leak coming from the clutch/flywheel housing and observation of burned clutch smell or clutch slipping.
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These symptoms can be mistaken as a crankshaft rear main seal leak, when the actual cause is the crankshaft adaptor O-ring.
CBR - 11L Engine block compatibility and Backward Conversion Parts Requirements
CBR - 13L Engine - Rear Main Oil Seal Leak Model Year 2025
CBR - 13L Engine - Rear Main Oil Seal Leak - Model Year 2025
CBR: Automated Manual Transmission (AMT) Model D or F (mDrive and I-Shift, AMT-D, AMT-F) - Transmission Oil Leakage From...
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Transmission Input Shaft Seal Or Output Shaft Seal - US10 And Newer Emissions, Common Model Years 2010 And Newer
CBR: 11L, 13L, And 16L Engine Oil Analysis Specifications - US10 And Newer Emissions
CBR: Turbo Compound 2nd Generation - EGR And O r DPF Diagnostic Trouble Codes(DTC), Diagnostic And Repair Information
CBR: Turbo Compound 2nd Generation - EGR And / Or DPF Diagnostic Trouble Codes (DTC), Diagnostic And Repair Information.
CBR: Turbo Compound (TC) Hot Side Noise, Diagnostic Information.
CBR: Vehicles built with an 11 liter engine may experience a complaint of excessive fuel in the oil.
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It is possible that the source of the fuel is the rear fuel galley plug in the cylinder head.
Infotainment
9 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.
CBR - For newly delivered vehicles it may be found that the key fob will not unlock the door.
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The message "Pre-delivery Mode" maybe displayed on the instrument cluster.
CBR: Drivers Information Display (DID) Inoperative/Goes Blank During Vehicle Operation
CBR: Drivers Information Display (DID)Inoperative After Cluster Replacement And Programming
CBR - Drivers Information Display (DID) Inoperative/Goes Blank During Vehicle Operation
CBR - Drivers Information Display (DID) Inoperative After Cluster Replacement And Programming
Tires & Wheels
8 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.
The purpose of this CBR is outline the interim software solution for PR(4) andAN(4).
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Note that this document is subject to updates and currently covers Service Pack updates to B2_T2_1.2.
SERVICE CAMPAIGN - Pitman Arm Pinch Bolt Alignment
CBR: Vehicles Equipped With A Lift Axle - Wheel Speed Fault Code SPN 793, SPN 794 Set When Axle Is Up
Lighting
7 bulletinsSC - Load Lock Clamp Install
CBR - 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
CBR - Purpose of this CBR is to address Pop up message for PTO Malfunction when there is not PTO Installed.
The purpose of this CBR is to provide instructions when trying to retrieve DTC and a Communication Failed Popup occurs.
CBR: The procedure to eliminate the Mack Chassis "Air Restriction Light On" seen in the cluster is to confirm that the...
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parameter YYT is set to "Enable" with Premium Tech Tool.
Transmission
6 bulletinsGDC - Transmission Oil Level Sensor
CBR - This bulletin provides guidance for identifying and addressing oil intrusion related to the Countershaft Brake...
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(CSB) in AMT-G transmissions.
If the vehicle door is open and the truck is in neutral, a popup message may appear on the Driver Information Display...
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(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 - Mack Chassis - Timing Gear Plate Repair
CBR: Mack chassis with an mDRIVE transmission, there have been reports of complete shift assemblies and TECUs being...
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replaced due to technicians being unable to pinpoint the source of the air leak.
CBR: Equipped With An Automated Manual Transmission Model D or F ( AMT-D, AMT-F, mDrive) Missing X1 Value In VDA And...
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Default Settings Guidelines, ParameterP1AOB; Fault Code P1052-54, Error 40,Or Error 18 Encountered During Clutch Or Tran.
Fuel System
5 bulletinsThe purpose of this CBR is to address issues of exhaust stack rotation on version 4 products.
Low Fuel Pressure
If oil dilution is suspected refer to the applicable CBR solution below: CBR-659Mack Chassis - Oil Diluted With Fuel;...
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Fuel In Oil, Diagnostic Information - All Emissions, All Model Years
Mack Trucks has determined that certain Mack sleeper cab assemblies were possibly manufactured with an insufficient...
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number of welds across the rear flange of the upper header. The reduced number of welds could lower the designed cab integrity.
CBR: Overhead Wear Overview - Model Year2018 To Current (Common Rail Fuel System ONLY)
Pre-Delivery & Maintenance
5 bulletinsCBR - Service Required Message PR(4), AN(4).
CBR - This CBR solution was created toprovide guidance on resolving the Service Required message that may appear in the...
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Instrument Cluster (IC) of VN (4) and PR (4) model vehicles under specific conditions.
Service Campaign: Interaxle Driveline Torque
Service Campaign: Interaxle Driveline Torque
CBR - Accelerator Pedal: Inspection Instructions
Brakes
4 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.
CBR: Mack Anthem (AN) And Pinnacle (PI) -Bendix ABS Fault SPN 807 FMI 13 Blink code 19-4
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
Suspension
4 bulletinsElectronically controlled suspension (ECS) calibration procedure.
CBR - Shock Interference With Z Springs.
CBR - Electronically Controlled Suspension (ECS) calibration using Premium Tech Tool (PTT) is required to correct...
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discrepancies between the cluster load indicator and actual scale values, ensuring proper functionality of liftable axles and preventing unintended axle behavior.
Frame lean can be caused by several seemingly isolated possibilities.
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The two most common are suspension and frame assembly issues.
Software & Calibration
4 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.
CBR - This document provides guidance for addressing the Air ProductionModulator (APM) DTC C10129B fault,...
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"High/Excessive Flow" This fault was introduced by a previous APM software package and requires specific containment actions.
Body & Paint
4 bulletinsSC - Certain model PRs could experience grille surround trim detaching due to insufficient retention.
CBR - Daycab Cab Roof Antenna Misalignment Causing Water Intrusion.
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.
CBR: Mack Chassis - Day Cab Glass Breakage
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
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).
Steering
2 bulletinsSC - Steering Stub Shaft Hardware Replacement
Service Campaign: Steering Stub Shaft Hardware Replacement