B12CA Code: Meaning, Causes, and Symptoms | OBD2 Codes

B12CA – Start/Stop Eco-Start Status Indicator Circuit Short

 

B12CA Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B12CA Possible Causes

 

Faulty Start/Stop Button,Start/Stop Button harness is open or shorted,Start/Stop Button circuit poor electrical connection

 

B12CA Description

 

The stop-start disable button is a momentary contact switch. It is normally open, Controlled Area Network (CAN) signal low. Closed (button being pushed) is CAN signal high. The Front Controls Interface Module reads the switch status and sends it over CAN to the Powertrain Control Module (PCM). If the button is stuck open, there are no low to high transitions. Since the PCM does not recognize a button push, stop-start will not be disabled if requested by the customer. If the button is stuck closed, there are no low to high transitions. Since the PCM does not recognize a button push, stop-start will not be disabled if requested by the customer.