# Service bulletin ITB20\-025

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: 10183965
- Published by NHTSA: 2020\-12\-08
- Manufacturer's number: ITB20\-025
- Manufacturer's date: 2020\-11\-10
- NHTSA component: SERVICE BRAKES

## NHTSA's summary

DTC B2724\-23 AND/OR C1B56\-04 STORED, AND/OR RAB ERROR MESSAGE OR WARNING IF YOU CONFIRM One or both of the following DTCs are stored: • B2724\-23 \(SONAR CONTROL UNIT \- SONAR ECU INTERNAL FAILURE \[UNDER VOLTAGE\]\) • C1B56\-04 \(SONAR CIRCUIT \- SYSTEM INTERNAL MALFUNCTION\) NOTE: A RAB warning may appear in the vehicle information display. ACTION Reprogram the Sonar Control Unit, if applicable.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10183965-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10183965-9999.pdf)

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

## Components

Brakes

## Trouble codes named

B2724, C1B56

## Vehicles listed

- 2020 INFINITI QX50

## Other bulletins for the same vehicles and component

- [ITB10\-074B](/bulletins/10233611.md), 2023-04-04, Service bulletin: SERVICE BRAKES. ABS/VDC CAN DIAGNOSIS INFORMATION This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.

JSON: [/v1/bulletins/10183965](/v1/bulletins/10183965)

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