Engine-Codes - Mercury - B12C4 MERCURY

B12C4 MERCURY Code - Mirror Turn Indicator Circuit Short

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

|B12C4 MERCURY code 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 MERCURY 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.

|B12C4 MERCURY code 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 MERCURY code

Labor: 1.0

The cost to diagnose the B12C4 MERCURY code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are B12C4 MERCURY code possible symptoms?

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

|What is B12C4 MERCURY code 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.

|Need more information with the B12C4 MERCURY code?

Need more information on how to fix the B12C4 MERCURY code?
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|Need help with a B12C4 MERCURY code?

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