# Service bulletin CBR\-15

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.

- Type: Service bulletin
- NHTSA id: 10198833
- Published by NHTSA: 2021\-07\-06
- Manufacturer's number: CBR\-15
- Manufacturer's date: 2021\-06\-15
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

Diagnostic Trouble Codes \(DTC\) For The Engine Pre\-Heat Relay: Supplementary Instructions

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198833-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198833-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Vehicles listed

- MACK CHU
- MACK CXU
- MACK GU
- MACK LR
- 2007 to 2018 MACK MRU
- 2007 to 2016 MACK PINNACLE \(CHU\)
- 2017 to 2022 MACK PINNACLE \(CHU\)
- 2007 to 2016 MACK PINNACLE \(CXU\)
- 2017 to 2022 MACK PINNACLE \(CXU\)
- 2018 to 2022 MACK PINNACLE \(PI/PN\)
- MACK TD
- VOLVO VAH
- VOLVO VHD
- VOLVO VNL
- VOLVO VNM
- VOLVO VNR
- 2013 to 2021 VOLVO VNX

## Other bulletins for the same vehicles and component

- [TSB M\-913\-001 202609](/bulletins/11037730.md), 2026-10-02, Service bulletin: ENGINE; POWER TRAIN. Parker engine\-mounted hydraulic pump service bulletin.
- [M0304 EC0033 202606](/bulletins/11034136.md), 2026-06-29, Emissions: ENGINE. Mack Trucks has determined that certain vehicles equipped with a model year \(“MY”\) 2017\-2018 MP8 Turbo Compound \(TC\) engine may not meet California and Federal Regulations \(CARB\). This Recall is for updated software that will reduce the amount of time necessary for the system to operate in a cold engine warm\-up strategy and provide health monitoring of the Selective Catalyst Reduction \(SCR\).
- [M0302 022026](/bulletins/11029451.md), 2026-03-03, Emissions: ENGINE. Emissions \- Mack Trucks has determined that certain vehicles equipped with a model year \(“MY”\) 2017\-2018 MP7 engine may not meet California and Federal Regulations \(CARB\).
- [CBR 820\-9 202601](/bulletins/11028051.md), 2026-02-03, Service bulletin: ENGINE; VEHICLE SPEED CONTROL. CBR \- Mack Chassis \- Engine Brake Only Works With The Brake Pedal, No Function During Cruise. US07 And Newer Emissions, Model Year 2008 And Newer.
- [CBR 2128\-7 202601](/bulletins/11028033.md), 2026-02-03, Service bulletin: ENGINE; ELECTRICAL SYSTEM. CBR \- Engine Control Module \(EMS\) Software Information \- Improvement List \(Change Log\), US21\+OBD2021 Emissions ONLY
- [CBR 2107\-22 202601](/bulletins/11028032.md), 2026-02-02, Service bulletin: ENGINE. CBR \- Mack DEF Level \(UQLS\) Sensor Troubleshooting Guide \- US17\+OBD16 Emissions to US22\+OBD2023 \(DOES NOT APPLY TO AN\(4\) and PR\(4\)\).
- [CBR 199 202512](/bulletins/11027007.md), 2026-01-05, Service bulletin: ENGINE. Vehicles affected by this issue will show coolant runoff on the front rights side of the engine.
- [CBR 2171\-11 202511](/bulletins/11026025.md), 2025-12-03, Service bulletin: ENGINE; ELECTRICAL SYSTEM. CBR \- Mack Temperature Sensor Troubleshooting Guide
- [CBR 199\-6 202511](/bulletins/11026021.md), 2025-12-03, Service bulletin: ENGINE. CBR \- 13 Liter Engines ONLY \- Engine Coolant Pump Housing Leak; Coolant Found Around The Oil Cooler Duct Cover Or In Between The Coolant Pump Housing And Oil Cooler Housing.
- [CBR 2107\-21 202505](/bulletins/11018813.md), 2025-06-02, Service bulletin: FUEL/PROPULSION SYSTEM; ENGINE. Mack DEF Level \(UQLS\) Sensor Troubleshooting Guide \- US17\+OBD16 Emissions and Newer

JSON: [/v1/bulletins/10198833](/v1/bulletins/10198833)

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