# Service bulletin 21NA149

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: 10200147
- Published by NHTSA: 2021\-08\-09
- Manufacturer's number: 21NA149
- Manufacturer's date: 2021\-06\-29
- NHTSA component: ELECTRICAL SYSTEM:WIRING; ENGINE

## NHTSA's summary

This technical bulletin provides repair information to correct a customer concern of Engine Wire Harness Chafing.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10200147-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10200147-9999.pdf)

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

## Components

Electrical system, Engine, Wiring and fuses

## Vehicles listed

- 2019 to 2021 CHEVROLET SILVERADO 1500
- 2019 to 2021 GMC SIERRA 1500

## Other bulletins for the same vehicles and component

- [PIP5838B](/bulletins/10216352.md), 2022-07-25, Service bulletin: ELECTRICAL SYSTEM:WIRING; FUEL SYSTEM, DIESEL; ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE. This Preliminary information communicates to the dealership technician a change made to the wire harness and reductant control module for the Diesel Exhaust Fluid tank connector.
- [22\-NA\-109](/bulletins/10213515.md), 2022-06-06, Service bulletin: ELECTRICAL SYSTEM; EXTERIOR LIGHTING; ELECTRICAL SYSTEM:WIRING:FUSES AND CIRCUIT BREAKERS. This informational bulletin provides information on Information on Common Customer Trailer Side Faults.
- [21NA149](/bulletins/10205552.md), 2021-12-27, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE; ELECTRICAL SYSTEM:WIRING. This technical bulletin provides repair information to correct a customer concern of Engine Wire Harness Chafing.
- [PIT5751C](/bulletins/10185738.md), 2021-01-25, Service bulletin: ELECTRICAL SYSTEM:WIRING. This Preliminary information communicates and issue with the SES MIL on setting DTC's P0201/P0202/P0203/P0204/P0205/P0206/P0216 and instructing dealership to inspect the engine wiring harness for damage.
- [PIT5751B](/bulletins/10179644.md), 2020-09-14, Service bulletin: ELECTRICAL SYSTEM:WIRING; ENGINE. This Preliminary information communicates and issue with the SES MIL on setting DTC's P0201/P0202/P0203/P0204/P0205/P0206/P0216 and instructing dealership to inspect the engine wiring harness for damage.
- [PIT5751A](/bulletins/10178360.md), 2020-08-10, Service bulletin: ENGINE; ELECTRICAL SYSTEM:WIRING. This Preliminary information communicates and issue with the SES MIL on setting DTC's P0201/P0202/P0203/P0204/P0205/P0206/P0216 and instructing dealership to inspect the engine wiring harness for damage.
- [PIT5311F](/bulletins/10178359.md), 2020-08-10, Service bulletin: ELECTRICAL SYSTEM:WIRING; ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL. This Preliminary Information communication provides information to the technician on the steps to diagnose and repair vehicles that may have an intermittent "Check Trailer Wiring" or "Service Trailer Brake" message on the Driver Information Center. Technician will inspect and clean the ground wire \(normally white wire\) connection on the trailer side of the 7\-pin connector. Inspect that the wires inside the trailer side connector are clean and securely fastened. If the vehicle?s 7\-way connector socket terminals are deformed or have excessive wear, it will be necessary to replace the truck side connector with part number 23404450.
- [PIT5751](/bulletins/10178321.md), 2020-08-10, Service bulletin: EQUIPMENT; ENGINE; ELECTRICAL SYSTEM:WIRING. This Preliminary information communicates and issue with the SES MIL on setting DTC's P0201/P0202/P0203/P0204/P0205/P0206/P0216 and instructing dealership to inspect the engine wiring harness for damage.
- [PIT5750](/bulletins/10178314.md), 2020-08-10, Service bulletin: ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM:WIRING. This Preliminary information communicates an issue with the battery goes dead and provides diagnostics tips on inspecting the LIN bus.
- [N192287840](/bulletins/10176822.md), 2020-06-29, Service bulletin: ELECTRICAL SYSTEM:WIRING; ENGINE. Service Update \- Certain vehicles equipped with a 2.7L turbo engine \(RPO L3B\), may have a condition where the engine wiring harness may have been wrapped and/or routed incorrectly, creating the potential for wear\-through in several locations. If this occurred it could allow the engine harness to short to ground and/or be severed, which may lead to a check engine light, reduced engine power, no start condition or in rare cases a stall. Dealers are to inspect harness for correct tape wrapping and install engine harness sleeves.

JSON: [/v1/bulletins/10200147](/v1/bulletins/10200147)

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