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

 

B12C5 Description

 

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.