OBD Guide
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B12BC

Mirror Position Sensor Supply Circuit Short To Ground

B12BC is an OBD-II diagnostic trouble code meaning: Mirror Position Sensor Supply Circuit Short To Ground. Common causes: wiring harness damage, oxidation of contacts. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect operation of mirrors
  • Mirrors do not respond to commands
  • Error notification on dashboard

Causes

  • Wiring harness damage
  • Oxidation of contacts
  • Mirror position sensor malfunction
  • Short circuit in power supply

How to Fix

  1. Check the integrity of the wiring harness
  2. Clean or replace oxidized contacts
  3. Test the mirror position sensor
  4. Replace sensor if necessary
  5. Check and eliminate short circuit

Related codes

B12BDB12BE

FAQ

What does the B12BC code mean?

B12BC is an OBD-II diagnostic trouble code that indicates: Mirror Position Sensor Supply Circuit Short To Ground

What causes a B12BC error code?

The most common causes of B12BC include: Wiring harness damage; Oxidation of contacts; Mirror position sensor malfunction; Short circuit in power supply.

How do I fix a B12BC diagnostic trouble code?

To fix B12BC: Check the integrity of the wiring harness. Clean or replace oxidized contacts. Test the mirror position sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B12BC?

Limited driving only, diagnose soon

How much does it cost to fix B12BC?

The estimated repair cost for B12BC is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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