# Service bulletin CBR\-2131

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: 10219423
- Published by NHTSA: 2022\-09\-08
- Manufacturer's number: CBR\-2131
- Manufacturer's date: 2022\-08\-29
- NHTSA component: ENGINE AND ENGINE COOLING

## NHTSA's summary

USE FOR NEW VEHICLES \(US21\+OBD22 Emissions\) \- Intermittent Diagnostic Trouble Codes U02A3, U029D, U029E

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2022/MC-10219423-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2022/MC-10219423-9999.pdf)

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

## Components

Engine

## Trouble codes named

U029D, U029E, U02A3

## Vehicles listed

- 2021 to 2023 MACK ANTHEM \(AN\)
- 2021 to 2023 MACK GRANITE \(GR\)
- 2021 to 2022 MACK LR
- 2021 to 2023 MACK LR ELECTRIC
- 2021 to 2023 MACK MD
- 2021 to 2022 MACK PINNACLE \(CHU\)
- 2021 to 2022 MACK PINNACLE \(CXU\)
- 2021 to 2023 MACK PINNACLE \(PI/PN\)
- 2021 MACK TE
- 2021 to 2022 MACK TERRAPRO \(MRU\)
- 2022 MACK TERRAPRO \(TE\)

## Recalls for the same vehicles and component

- [26V139000](/recalls/nhtsa/26V139000.md), 2026-03-11: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE
- [22V606000](/recalls/nhtsa/22V606000.md), 2022-08-09: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\)

## 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.
- [M0039 032026](/bulletins/11030590.md), 2026-04-02, Emissions: ENGINE. Emissions \- EC0039 MST21 Failure to Detect P20EE \- AN, CHU.
- [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 2495 092025](/bulletins/11023450.md), 2025-10-01, Service bulletin: ELECTRICAL SYSTEM; ENGINE. The purpose of the 48V EATS heater system is to provide additional heat to the exhaust stream allowing the EATS to become active earlier during acold start and during engine operation that produces low exhaust gas temperatures.
- [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
- [CBR 170\-8 202505](/bulletins/11018804.md), 2025-06-02, Service bulletin: ENGINE. Inactive Code P25AE00 Being Generated After A Hard Pull And A Momentary Drop In Engine Oil Pressure \(Low Oil Pressure\) \(Possible Related Codes \- SPN4811 , SPN 100 , PID 100\)

JSON: [/v1/bulletins/10219423](/v1/bulletins/10219423)

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