Engine-Codes - Generic - B12C4

B12C4 - Mirror Turn Indicator Circuit Short

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

B12C4 Possible Causes

  • Faulty Mirror Turn Indicator
  • Mirror Turn Indicator harness is open or shorted
  • Mirror Turn Indicator circuit poor electrical connection
  • Faulty Driver Door Module (DDM)

How is the B12C4 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.

Tech Notes

B12C4:11 Mirror Turn Indicator Circuit Short To Ground
B12C4:15 Mirror Turn Indicator Circuit Short To Battery Or Open

What is the cost to diagnose the B12C4 code

Labor: 1.0

The cost to diagnose the B12C4 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)

B12C4 Meaning

The Driver Door Module (DDM) monitors the Mirror Turn Indicator Circuit. The DDM sets the OBDII code when the Mirror Turn Indicator Circuit is not to factory specifications.

More Information

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Information for specific makes

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