U0129 Mercury Code - Lost Communication With Brake System Control Module
Quick Answer
The Powertrain Control Module (PCM) continuously monitors the Controller Area Network (CAN) for messages from the Transmission Control Module (TCM). Common causes include Faulty Anti-Lock Brake System (ABS) Control Module, Anti-Lock Brake System (ABS) Control Module harness is open or shorted, Anti-Lock Brake System (ABS) Control Module 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
- U0129 Mercury indicates Lost Communication With Brake System Control Module.
- Common causes
- Common causes include Faulty Anti-Lock Brake System (ABS) Control Module, Anti-Lock Brake System (ABS) Control Module harness is open or shorted, Anti-Lock Brake System (ABS) Control Module 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.
Code U0129 Mercury Description
What are the Possible Causes of the DTC U0129 Mercury?
- Faulty Anti-Lock Brake System (ABS) Control Module
- Anti-Lock Brake System (ABS) Control Module harness is open or shorted
- Anti-Lock Brake System (ABS) Control Module circuit poor electrical connection
How to Fix the DTC U0129 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 U0129 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.
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Frequently Asked Questions about U0129 Mercury Code
1. What are the common symptoms of OBDII code U0129 in a Mercury vehicle?
- Common symptoms include the ABS warning light, traction control light, or brake system warning light illuminating on the dashboard. Additionally, you may experience issues with the ABS system, traction control system, or brake system not functioning properly.
2. What can cause the OBDII code U0129 "Lost Communication With Brake System Control Module" in a Mercury car?
- The code U0129 can be triggered by issues such as a faulty brake system control module, damaged wiring or connectors between the control module and the PCM, or a software glitch in the vehicle's network communication system.
3. How can I diagnose the OBDII code U0129 in my Mercury vehicle?
- Diagnosing code U0129 typically involves using a professional OBDII scanner to retrieve the code, checking for any other related codes, inspecting the wiring and connectors around the brake system control module, and testing the communication between the control module and the PCM.
4. Is it safe to drive with the OBDII code U0129 present in my Mercury car?
- It is not recommended to drive with the U0129 code active, as it indicates a communication issue with the brake system control module, which can affect the proper functioning of critical safety systems like ABS and traction control.
5. How can I repair the OBDII code U0129 in my Mercury vehicle?
- Repair options for U0129 may include checking and repairing any damaged wiring or connectors, replacing the brake system control module if it's faulty, updating the software in the control module, or seeking assistance from a qualified mechanic for further diagnosis and repair.
6. Can a DIY enthusiast fix the OBDII code U0129 issue in a Mercury car?
- Depending on the underlying cause, some DIY enthusiasts with advanced automotive repair skills and access to the necessary tools may be able to address the U0129 code by inspecting and repairing wiring or connectors. However, complex issues may require professional assistance.
7. Will resetting the OBDII code U0129 in my Mercury vehicle make the problem go away?
- Simply resetting the code without addressing the root cause will not fix the underlying issue causing the U0129 code. It's important to diagnose and repair the problem to prevent it from recurring.
8. How much does it typically cost to repair the OBDII code U0129 in a Mercury car?
- The cost of repairing the U0129 code can vary depending on the specific cause of the issue, the extent of the repairs needed, and whether new parts are required. It's best to consult with a mechanic for a more accurate estimate.
9. Can extreme weather conditions or environmental factors trigger the OBDII code U0129 in a Mercury vehicle?
- While extreme weather conditions or environmental factors can potentially affect electronic components in a vehicle, the U0129 code is usually caused by underlying issues like module failure or wiring problems rather than external factors.
10. Are there any preventive measures to avoid encountering the OBDII code U0129 in a Mercury car?
- Regular maintenance, including checking the condition of wiring and connectors, keeping the brake system control module updated with the latest software, and addressing any warning lights promptly, can help prevent issues that may lead to the U0129 code.
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