Engine-Codes - Generic - B12C5

B12C5 - Engine Start/Stop Switch Failure

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

B12C5 Possible Causes

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

How is the B12C5 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 B12C5 code

Labor: 1.0

The cost to diagnose the B12C5 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)

B12C5 Meaning

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.

More Information

Need more information on how to fix the B12C5 code?
Get Access to Factory Service Manuals

Information for specific makes

Need more help?

Get the B12c5 code diagnosed by a professional: Find a repair shop in your area