DTC C0040-12

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DTC C0040-12 : Brake Light Switch Failure (Stuck ON)/Brake Pedal Stroke Sensor Stuck (EBB)

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 9.6 - 16.5 V No other DTCs detected With the Driving Pattern: Turn the vehicle to the READY TO DRIVE mode. Test-drive the vehicle under these conditions: (Be careful of the surrounding traffic conditions.) Vehicle speed at 9 mph (15 km/h) or more for at least 60 seconds Accelerator pedal pressed Brake pedal released
Execution	Regular Diagnosis
Duration	About 60 seconds
DTC Type	1 drive cycle VSA indicator on
Fail Safe Action	Degrade ABS performance Stop engine drag torque control function Stop TCS function Stop VSA function Stop agile handling assist function Degrade hydraulic boost failure compensation function
Possible Cause	Short to power between the brake pedal position switch and the PCM (STOP_SW line) Brake pedal height incorrect position Brake pedal position switch failure PCM internal failure VSA modulator-control unit internal failure