# C1B56 on the 2020 Infiniti QX50

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here.

## Bulletins for this model year that name C1B56

- [11004955](https://open.wenmarpro.com/bulletins/11004955), 2024-07-19: DTC B2724\-23 AND/OR C1B56\-04 STORED, AND/OR RAB ERROR MESSAGE OR WARNING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
- [10200010](https://open.wenmarpro.com/bulletins/10200010), 2021-08-06: DTC B2724\-23 AND/OR C1B56\-04 STORED, AND/OR RAB ERROR MESSAGE OR WARNING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
- [10186822](https://open.wenmarpro.com/bulletins/10186822), 2021-02-06: DTC B2724\-23 AND/OR C1B56\-04 STORED, AND/OR RAB ERROR MESSAGE OR WARNING This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
- [10183965](https://open.wenmarpro.com/bulletins/10183965), 2020-12-08: 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.