B12C5 Code: Meaning, Causes, and Symptoms | OBD2 Codes
B12C5 – Engine Start/Stop Switch Failure
B12C5 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
B12C5 Possible Causes
Faulty Start/Stop Switch,Start/Stop Switch harness is open or shorted,Start/Stop Switch circuit poor electrical connection
This Push Button Ignition Switch is a single pole momentary design with position indicator LEDs controlled by the Keyless access control unit. Once the Keyless access control unit detects the presence of a registered key fob and the brake pedal is not depressed, each time the button is pushed the Body Control Module will cycle through Accessories, On and Off modes. The Body Control Module will also illuminate the appropriate position indicator LED. If the brake pedal is depressed, the shift lever is in Park and the button is pushed, the Keyless access control unit will start the engine.