# Service bulletin B21030C

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: 10189135
- Published by NHTSA: 2021\-03\-17
- Manufacturer's number: B21030C
- Manufacturer's date: 2021\-03\-10
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

ServiceNews Article \- If you are diagnosing a failure in a telematic control unit \(TCU\), never swap it with another from a donor vehicle. Swapping TCUs between two vehicles can cause communication issues with American Honda's cellular providers.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189135-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10189135-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- ACURA ACURA

JSON: [/v1/bulletins/10189135](/v1/bulletins/10189135)

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