AutoCodes – Mercury – B129F Mercury

B129F Mercury Code - Function LED Semi-Automatic Advanced Parallel Park Circuit Short

Quick Answer

The Body Control Module (BCM) monitors the Central Lock Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator. Common causes include Faulty Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator, Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator harness is open or shorted, Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator 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
B129F Mercury indicates Function LED Semi-Automatic Advanced Parallel Park Circuit Short.
Common causes
Common causes include Faulty Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator, Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator harness is open or shorted, Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator 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 1,021
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Nov 29, 2024
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Code B129F Mercury Description

The Body Control Module (BCM) monitors the Central Lock Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator. The BCM sets the OBDII code when the Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator is not to factory specifications.
OBDII Code B129F Mercury - Function LED Semi-Automatic Advanced Parallel Park Circuit Short - AutoCodes.com
B129F Mercury Code - Function LED Semi-Automatic Advanced Parallel Park Circuit Short

What are the Possible Causes of the DTC B129F Mercury?

  • Faulty Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator
  • Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator harness is open or shorted
  • Enable/Disable Switch Semiautomatic Advanced Parallel Park Actuator circuit poor electrical connection
  • Faulty Body Control Module (BCM)

How to Fix the DTC B129F 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.

Code Tech Notes

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B129F 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 B129F Mercury code?

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Need Help with the Code?

Get the B129F Mercury code diagnosed by a professional: Find a repair shop in your area

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 B129F Mercury Code

1. What are the common symptoms of OBDII code B129F in a Mercury related to the Function LED Semi-Automatic Advanced Parallel Park Circuit Short?

- The common symptoms include the Function LED not lighting up during parallel parking assistance and potential issues with the semi-automatic park assist feature.

2. What can cause OBDII code B129F to trigger in a Mercury?

- The code B129F may be triggered by a short circuit in the wiring of the Function LED semi-automatic advanced parallel park circuit.

3. How can I diagnose the cause of OBDII code B129F in my Mercury?

- To diagnose the issue, you can start by inspecting the wiring harness of the Function LED circuit for any visible damage or shorts. Using a multimeter to check for continuity can also help pinpoint the problem.

4. Can I still drive my Mercury with OBDII code B129F present?

- It is generally safe to drive the vehicle with this code, but it's recommended to address the issue as soon as possible to ensure the proper functioning of the park assist system.

5. Is it possible to repair OBDII code B129F in a Mercury without professional help?

- Depending on your technical skills and access to tools, you may be able to repair the issue yourself by fixing the wiring short or replacing the malfunctioning components in the Function LED circuit.

6. Will resetting the OBDII code B129F in my Mercury make it go away permanently?

- Resetting the code without addressing the underlying issue will not make it disappear permanently. The problem causing the code will need to be identified and fixed to prevent it from reoccurring.

7. Are there any safety concerns associated with OBDII code B129F in a Mercury?

- While the code itself may not pose an immediate safety risk, a malfunctioning park assist system can potentially impact your ability to parallel park accurately and safely.

8. How much does it typically cost to repair OBDII code B129F in a Mercury at a professional auto repair shop?

- The cost of repairing code B129F can vary depending on the extent of the damage and the rates of the repair shop. It's advisable to get a diagnostic assessment first to determine the exact repair costs.

9. Can extreme weather conditions affect the Function LED Semi-Automatic Advanced Parallel Park Circuit and trigger OBDII code B129F in a Mercury?

- Extreme weather conditions, such as excessive heat or moisture, can potentially damage the wiring or components of the park assist system, leading to the triggering of code B129F.

10. Will fixing OBDII code B129F require reprogramming or calibration of the park assist system in my Mercury?

- In some cases, after fixing the issue causing code B129F, recalibration or reprogramming of the park assist system may be necessary to ensure proper functionality.

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