AutoCodes – Generic – B12BC

B12BC Code - Mirror Position Sensor Supply Circuit Short To Ground

Quick Answer

The Body Control Module (BCM) monitors the Mirror Position Sensor. Common causes include Faulty Mirror Position Sensor, Mirror Position Sensor harness is open or shorted, Mirror Position Sensor circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B12BC indicates Mirror Position Sensor Supply Circuit Short To Ground.
Common causes: Common causes include Faulty Mirror Position Sensor, Mirror Position Sensor harness is open or shorted, Mirror Position Sensor circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 807

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B12BC Description

The Body Control Module (BCM) monitors the Mirror Position Sensor. The BCM sets the OBDII code when the Mirror Position Sensor is not to factory specifications.

OBDII Code B12BC - Mirror Position Sensor Supply Circuit Short To Ground - AutoCodes.com — B12BC Code - Mirror Position Sensor Supply Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B12BC?

Faulty Mirror Position Sensor
Mirror Position Sensor harness is open or shorted
Mirror Position Sensor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B12BC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B12BC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B12BC code?

Need more information on how to fix the B12BC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B12BC code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B12BC Ford — Mirror Position Sensor Supply Circuit Short To Ground
B12BC Lincoln — Mirror Position Sensor Supply Circuit Short To Ground
B12BC Mercury — Mirror Position Sensor Supply Circuit Short To Ground

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B12BC Code

1. What are the common symptoms of OBDII code B12BC (Mirror Position Sensor Supply Circuit Short To Ground)?

The common symptoms include erratic mirror movement, non-functional mirror adjustment, and the mirror not holding its set position.

2. What can cause the Mirror Position Sensor Supply Circuit to short to ground?

Potential causes of this issue can include damaged wiring, a faulty mirror position sensor, or a malfunctioning control module.

3. How can I diagnose the Mirror Position Sensor Supply Circuit Short To Ground issue?

Diagnosing this problem would involve using a multimeter to test for continuity and resistance in the circuit, as well as inspecting the wiring and sensor for any visible damage.

4. Can I still drive my vehicle with the B12BC code present?

While the vehicle may still be drivable with this code, it is recommended to address the issue promptly to prevent further damage to the mirror adjustment system.

5. How do I repair the Mirror Position Sensor Supply Circuit Short To Ground problem?

Repairing this issue may involve repairing or replacing damaged wiring, replacing the mirror position sensor, or addressing any faults in the control module.

6. Will resetting the trouble codes make the B12BC code go away?

Resetting the trouble codes may temporarily clear the code, but if the underlying issue causing the short to ground is not fixed, the code is likely to reappear.

7. Can a DIY enthusiast fix the Mirror Position Sensor Supply Circuit Short To Ground problem?

Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and repair this issue, but professional help is recommended for complex electrical problems.

8. Is it possible for the B12BC code to be a false alarm?

While rare, false alarms are possible. It's advised to verify the diagnosis by checking the wiring, sensor, and control module before proceeding with repairs.

9. How much does it typically cost to fix the Mirror Position Sensor Supply Circuit Short To Ground issue?

The cost of fixing this problem can vary depending on the extent of the damage and whether components need to be replaced. It's recommended to consult a mechanic for an accurate estimate.

10. Are there any preventive measures to avoid encountering the B12BC code in the future?

Regularly inspecting the mirror adjustment system for any signs of wear or damage, and addressing any issues promptly, can help prevent the recurrence of the Mirror Position Sensor Supply Circuit Short To Ground problem.