Engine-Codes - Generic - B12CB

B12CB - Start/Stop Eco-Start Enable Button Circuit Short To Ground

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

B12CB Possible Causes

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

How is the B12CB code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the B12CB code

Labor: 1.0

The cost to diagnose the B12CB code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B12CB Meaning

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.

More Information

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Information for specific makes

  • B12CB FORD Start/Stop Eco-Start Enable Button Circuit Short To Ground
  • B12CB LINCOLN Start/Stop Eco-Start Enable Button Circuit Short To Ground
  • B12CB MERCURY Start/Stop Eco-Start Enable Button Circuit Short To Ground

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