DTC C0023-12

DTC C0023-12 : Brake Diag Circuit ON Failure

NOTE:

Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the ABS/VSA indicator comes on, and continues until the indicator goes off.
Regular Diagnosis:
The regular on-board diagnosis begins right after the ABS/VSA indicator goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
Review "How to troubleshoot the VSA system" before doing the DTC troubleshooting procedure.
Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified.
The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Confirmation Procedure	Basic Condition: 12 volt battery voltage above 10 V With the Driving Pattern: Turn the vehicle to the ON mode. Wait 2 seconds or more without pressing the brake pedal.
Execution	Regular Diagnosis
Duration	About 2 seconds
DTC Type	1 drive cycle VSA indicator on
Fail Safe Action	Stop ACC function Stop CMBS function
Possible Cause	Brake light relay failure Short to ground between the VSA modulator-control unit and the brake light relay (BRAKE LAMP line) Open between the PCM and the brake pedal position switch (STOP SW line) PCM internal failure VSA modulator-control unit internal failure