# Service bulletin 21NA002

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: 10187767
- Published by NHTSA: 2021\-03\-01
- Manufacturer's number: 21NA002
- Manufacturer's date: 2021\-01\-13
- NHTSA component: EQUIPMENT:ELECTRICAL:ENGINE BLOCK HEATER; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\); FUEL SYSTEM, DIESEL

## NHTSA's summary

This informational bulletin provides a test procedure, for a possible faulty DEF Heater.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187767-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10187767-9999.pdf)

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

## Components

Engine, Equipment and accessories, Fuel system, Engine control module

## Vehicles listed

- 2021 CADILLAC ESCALADE ESV
- 2021 CADILLAC ESCALADE NA
- 2020 to 2021 CHEVROLET SILVERADO 1500
- 2020 to 2021 CHEVROLET SILVERADO 2500
- 2020 to 2021 CHEVROLET SILVERADO 3500
- 2021 CHEVROLET SUBURBAN
- 2020 to 2021 GMC SIERRA 1500
- 2020 to 2021 GMC SIERRA 2500
- 2020 to 2021 GMC SIERRA 3500
- 2021 GMC YUKON
- 2021 GMC YUKON XL

## Other bulletins for the same vehicles and component

- [PIT5687A](/bulletins/10249954.md), 2024-02-12, Service bulletin: UNKNOWN OR OTHER; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE. This Preliminary information communicates some diagnostic tips to inspect for no/low voltage at the ECM for a customers complaints of a SES MIL, Crank No Start, stalling DTC's: P16A7 and/or P16AF.
- [PIP5628F](/bulletins/10236164.md), 2023-05-15, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). This Preliminary information communicates information that will need to be provided to TAC to aid in diagnosing if a vehicle comes in with misfire and DTC Codes P0300 \- P0308 and/or P050D
- [N212355140](/bulletins/10230578.md), 2023-01-24, Service bulletin: ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). Service Update Bulletin \- Certain vehicles may have a condition where the engine control module has an incorrect calibration. Dealers are to reprogram the engine control module.
- [N222372592](/bulletins/10228951.md), 2023-01-07, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\). Service Update. Certain vehicles may have a condition in which ice or sludge can accumulate in the Charge Air Cooler \(CAC\) or Closed Crankcase Ventilation \(CCV\) system when driving in extremely cold weather conditions \(\-18°C \(0°F\) or less\). Dealers will install a radiator air front lower baffle and, if necessary, reprogram the Engine Control Module.
- [21NA113](/bulletins/10214207.md), 2022-06-21, Service bulletin: ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE. This technical bulletin provides a procedure to perform a learn procedure for the turbo actuator.
- [20NA090](/bulletins/10214199.md), 2022-06-21, Service bulletin: EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE. This informational bulletin provides a way for the technician to identify if the ECM has been modified.
- [20NA228](/bulletins/10212563.md), 2022-05-31, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE; FUEL SYSTEM, OTHER:FUEL FILTER; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\); UNKNOWN OR OTHER. This technical bulletin provides a procedure to replace the fuel filter and perform a filter life procedure if found the reason for a failed fuel filter life reset during ECM transfer of data.
- [20NA197](/bulletins/10212562.md), 2022-05-31, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\); BACK OVER PREVENTION; SERVICE BRAKES, HYDRAULIC. This technical bulletin provides a procedure to inspect and repair the fuel pressure sensor if found the cause of the customers concern.
- [20NA189](/bulletins/10212561.md), 2022-05-31, Service bulletin: ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\); POWER TRAIN. This technical bulletin provides repair information to correct a customer concern of Transmission Control Module Offline Event.
- [22\-NA\-076](/bulletins/10210438.md), 2022-04-22, Service bulletin: ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE. This technical bulletin provides repair information to correct a customer concern of software anomalies in the Engine Control Module.

JSON: [/v1/bulletins/10187767](/v1/bulletins/10187767)

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