# Service bulletin 18NA092

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: 10137424
- Published by NHTSA: 2018\-05\-21
- Manufacturer's number: 18NA092
- Manufacturer's date: 2018\-03\-28
- NHTSA component: EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.; ELECTRICAL SYSTEM:WIRING

## NHTSA's summary

This technical bulletin provides a procedure to repair a bad terminal and re\-route the harness to prevent the future event of Radio Audio Randomly Cuts Out DTC U18B4 \- Lost Communication with Radio on Ethernet Bus from happening again.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10137424-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10137424-0001.pdf)

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

## Components

Electrical system, Equipment and accessories, Wiring and fuses

## Trouble codes named

U18B4

## Vehicles listed

- 2018 GMC TERRAIN

## Other bulletins for the same vehicles and component

- [19NA181](/bulletins/10212557.md), 2022-05-31, Service bulletin: ENGINE; ELECTRICAL SYSTEM:WIRING. This technical bulletin provides a procedure to locate and repair the engine wiring harness.
- [PIT5748](/bulletins/10178304.md), 2020-08-10, Service bulletin: EQUIPMENT:RECREATIONAL VEHICLE/TRAILER:120/240 VAC ELECTRICAL SYSTEM:WIRING; ELECTRICAL SYSTEM:WIRING. This preliminary information makes the technician aware of a trailer lighting concern if the incorrect harness is used to wire trailer.
- [100089005G](/bulletins/10159575.md), 2019-05-13, Service bulletin: ELECTRICAL SYSTEM:WIRING. This warranty admin bulletin explains to the technician additional information may be needed when submitting transactions when doing wiring repairs.
- [100089005H](/bulletins/10154629.md), 2019-03-18, Service bulletin: ELECTRICAL SYSTEM:WIRING. This warranty admin bulletin explains to the technician additional information may be needed when submitting transactions when doing wiring repairs.
- [PIP5563](/bulletins/10137195.md), 2018-05-21, Service bulletin: ELECTRICAL SYSTEM:WIRING; ENGINE. This Preliminary information communicates of possible chafed wire in the engine harness that is routedon top of the trans assembly.

JSON: [/v1/bulletins/10137424](/v1/bulletins/10137424)

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