AutoCodes – Mercury – B102F Mercury

B102F Mercury Code - Auxiliary Switch Signal Erratic

Quick Answer

The Body Control Module (BCM) monitors the Auxiliary Switch. Common causes include Faulty Auxiliary Switch, Auxiliary Switch harness is open or shorted, Auxiliary Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B102F Mercury indicates Auxiliary Switch Signal Erratic.
Common causes: Common causes include Faulty Auxiliary Switch, Auxiliary Switch harness is open or shorted, Auxiliary Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,130

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B102F Mercury Description

The Body Control Module (BCM) monitors the Auxiliary Switch. The BCM sets the OBDII code when the Auxiliary Switch is not to factory specifications.

OBDII Code B102F Mercury - Auxiliary Switch Signal Erratic - AutoCodes.com — B102F Mercury Code - Auxiliary Switch Signal Erratic

What does this mean?

What are the Possible Causes of the DTC B102F Mercury?

Faulty Auxiliary Switch
Auxiliary Switch harness is open or shorted
Auxiliary Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B102F Mercury?

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 B102F Mercury 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 B102F Mercury code?

Need more information on how to fix the B102F Mercury code? Get Access to Factory Service Manuals

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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 B102F Mercury Code

1. What are the common symptoms of OBDII code B102F in a Mercury related to the Auxiliary Switch Signal Erratic?

- Common symptoms include intermittent or erratic operation of auxiliary switches in the vehicle, such as power windows, mirrors, or lights.

2. What are the possible causes of the B102F code in a Mercury?

- The B102F code is typically caused by wiring issues, faulty switches, or a malfunction in the control module responsible for managing auxiliary switch signals.

3. How can I diagnose the B102F code in my Mercury?

- To diagnose the B102F code, you can use an OBDII scanner to read the fault codes and inspect the wiring and connections related to the auxiliary switches for any visible damage or loose connections.

4. Is it safe to continue driving my Mercury with the B102F code present?

- It is generally safe to drive with the B102F code, but you may experience issues with the operation of the affected auxiliary switches. It is recommended to address the problem as soon as possible to avoid further complications.

5. Can I repair the B102F code in my Mercury on my own?

- Depending on your level of automotive expertise, you may be able to repair the B102F code on your own by checking and repairing any damaged wiring or replacing faulty switches. However, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

6. Are there any specific repair tips for fixing the B102F code in a Mercury?

- One common repair tip is to carefully inspect the wiring harness and connectors for any signs of wear, corrosion, or damage. Additionally, testing each auxiliary switch individually can help pinpoint the exact source of the issue.

7. Will resetting the OBDII system clear the B102F code in my Mercury?

- Resetting the OBDII system may temporarily clear the B102F code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is important to diagnose and repair the root cause of the problem.

8. Can extreme weather conditions cause the B102F code to trigger in a Mercury?

- Extreme weather conditions, such as temperature fluctuations or moisture exposure, can potentially affect the electrical components associated with the auxiliary switches, leading to the B102F code. Insulating or protecting these components may help prevent issues.

9. Are there any recalls or technical service bulletins related to the B102F code in Mercury vehicles?

- It is recommended to check with your local Mercury dealership or online resources for any recalls or technical service bulletins related to the B102F code in your specific model and year to stay informed about potential solutions or updates.

10. How much can I expect to pay for the repair of the B102F code in my Mercury?

- The cost of repairing the B102F code in a Mercury can vary depending on the root cause of the issue, the needed parts, and labor costs. It is advisable to obtain quotes from multiple mechanics or dealerships to compare prices and make an informed decision.