U129D
Lost Communication With The Precision All Wheel Steer Control Unit
U129D is an OBD-II diagnostic trouble code meaning: Lost Communication With The Precision All Wheel Steer Control Unit. Common causes: open or short circuit in wiring harness, malfunction of the all-wheel drive control unit. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- The all-wheel drive system may not work correctly
- Possible problems with controllability
- In some cases the system may shut down completely
Causes
- Open or short circuit in wiring harness
- Malfunction of the all-wheel drive control unit
- Control unit power supply problems
- Corrosion of contacts or connectors
- Problems with the CAN bus
How to Fix
- Check the integrity of the wiring harness to the control unit
- Check the power supply and grounding of the control unit
- Inspect connectors for corrosion or damage
- Check the operation of the control unit
- Scan the CAN bus for errors
Related codes
FAQ
What does the U129D code mean?
U129D is an OBD-II diagnostic trouble code that indicates: Lost Communication With The Precision All Wheel Steer Control Unit
What causes a U129D error code?
The most common causes of U129D include: Open or short circuit in wiring harness; Malfunction of the all-wheel drive control unit; Control unit power supply problems; Corrosion of contacts or connectors.
How do I fix a U129D diagnostic trouble code?
To fix U129D: Check the integrity of the wiring harness to the control unit. Check the power supply and grounding of the control unit. Inspect connectors for corrosion or damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U129D?
Limited driving only, diagnose soon
How much does it cost to fix U129D?
The estimated repair cost for U129D is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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