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Engine-Codes – Generic – U129D

U129D Code - Lost Communication With The Precision All Wheel Steer Control Unit

Quick Answer

The U129D code indicates that there is a communication problem between the vehicle's onboard computer system and the Precision All Wheel Steer (PAWS) control unit. Common causes include Faulty wiring or connectors in the communication network, Malfunctioning Precision All Wheel Steer control unit, Software glitches in the onboard computer system. 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
U129D indicates Lost Communication With The Precision All Wheel Steer Control Unit.
Common causes
Common causes include Faulty wiring or connectors in the communication network, Malfunctioning Precision All Wheel Steer control unit, Software glitches in the onboard computer system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code U129D Description

The U129D code indicates that there is a communication problem between the vehicle's onboard computer system and the Precision All Wheel Steer (PAWS) control unit. The PAWS system is responsible for controlling the steering angles of the rear wheels to enhance handling and stability during driving. When communication is lost with this control unit, it can lead to issues with the vehicle's steering performance, stability, and overall handling.

OBDII Code U129D - Lost Communication With The Precision All Wheel Steer Control Unit
U129D Code - Lost Communication With The Precision All Wheel Steer Control Unit

Common Causes of U129D

  1. Faulty wiring or connectors in the communication network
  2. Malfunctioning Precision All Wheel Steer control unit
  3. Software glitches in the onboard computer system
  4. Electrical issues such as a blown fuse or relay
  5. Water damage or corrosion in the control unit or wiring

Symptoms of U129D

  1. Erratic steering behavior
  2. Reduced stability during cornering
  3. Warning lights illuminated on the dashboard
  4. Difficulty controlling the vehicle at higher speeds
  5. Unusual noises coming from the rear of the vehicle

How to Fix U129D

  1. Perform a comprehensive diagnostic scan to retrieve the specific error codes and pinpoint the source of the communication failure.
  2. Inspect the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the Precision All Wheel Steer control unit for functionality and replace if found to be faulty.
  4. Check for software updates for the onboard computer system and ensure all systems are properly calibrated.
  5. Clear the error codes and perform a test drive to confirm that the issue has been resolved.

Cost to Fix U129D

The typical repair costs for addressing the U129D code can vary depending on the specific cause of the communication failure and the extent of the repairs needed. In general, the parts and labor required for this repair could range from $200 to $800 or more. However, it's important to note that diagnosis time and labor rates at auto repair shops can fluctuate based on various factors. It is recommended to consult with a professional mechanic or dealership to get an accurate estimate for your specific vehicle.

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Code U129D Information for Specific Makes

  • U129D Acura — Lost Communication With The Precision All Wheel Steer Control Unit
  • U129D Honda — Lost Communication With The Precision All Wheel Steer Control Unit
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 U129D Code

1. What are the common symptoms of OBDII code U129D?

- Common symptoms include the ABS warning light, traction control warning light, and stability control warning light illuminating on the dashboard.

2. What does the OBDII code U129D mean?

- The code U129D indicates that there is a communication problem between the vehicle's onboard computer and the Precision All Wheel Steer Control Unit.

3. What are the possible causes of code U129D?

- The code U129D can be caused by a faulty control unit, damaged wiring or connectors, a software glitch, or a communication bus issue in the vehicle.

4. How can I diagnose the U129D code?

- Diagnosing the U129D code typically involves using a diagnostic scanner to retrieve the code, checking the wiring and connectors for damage, and testing the control unit for proper functionality.

5. Can driving with the U129D code present cause any harm to the vehicle?

- Driving with the U129D code present may affect the vehicle's stability control and all-wheel steering functionality, potentially compromising the vehicle's handling and safety.

6. How can I repair the U129D code?

- Repairing the U129D code may involve replacing the Precision All Wheel Steer Control Unit, repairing damaged wiring or connectors, updating software, or addressing any communication bus issues in the vehicle.

7. Is it safe to continue driving my vehicle with the U129D code?

- It is not recommended to drive the vehicle with the U129D code present, as it can impact the vehicle's stability and overall safety systems.

8. How much does it typically cost to repair the U129D code?

- The cost of repairing the U129D code can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can I reset the U129D code on my own?

- While you can attempt to clear the code using a diagnostic scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

10. Is the U129D code common in specific vehicle makes or models?

- The U129D code is more commonly found in vehicles equipped with Precision All Wheel Steer systems, such as certain Acura and Honda models.

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