[SOLVED] Fixing U129D: Communication Loss With Precision All Wheel Steer Unit

The automobile fault code U129D indicates a problem with the Precision All-Wheel Steer Control Unit. The most common symptom is the Engine Light ON or Service Engine Soon Warning Light. The cause of this issue could be a faulty Precision All-Wheel Steer Control Unit, an open or shorted harness, a poor electrical connection, or a faulty Powertrain Control Module (PCM).

The repair importance is high as it affects the vehicle’s performance and safety. The repair difficulty is moderate, and the repair time is estimated at 1.0 hour. To fix the issue, one should visually inspect the related wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

If you notice the Engine Light ON (or Service Engine Soon Warning Light), it could be due to the u129d fault code.

Here are the symptoms to look out for:

  • The U129D fault code in an automobile can cause several symptoms, including the engine light turning on or the service engine soon warning light appearing.
  • Other symptoms may include issues with the transmission, such as difficulty shifting gears or the transmission slipping.
  • The vehicle may also experience reduced power or acceleration, and the engine may stall or hesitate during operation.
  • Additionally, the vehicle’s fuel efficiency may decrease, and there may be a noticeable decrease in overall performance.

The automobile fault code u129d can be caused by a faulty control unit, harness issues, or a faulty powertrain control module.

  • The automobile fault code U129D can be caused by a faulty Precision All-Wheel Steer Control Unit.
  • It can also be caused by an open or shorted Precision All-Wheel Steer Control Unit harness.
  • Another cause can be a poor electrical connection in the Precision All-Wheel Steer Control Unit circuit.
  • Lastly, a faulty Powertrain Control Module (PCM) can also cause this fault code.

To fix the u129d automobile fault code, check the possible causes and inspect related wiring harness, connectors, and components for damage.

  • To fix the automobile fault code u129d, first, check the possible causes listed above.
  • Then, visually inspect the related wiring harness and connectors.
  • Look for damaged components and check for broken, bent, pushed out, or corroded connector’s pins.
  • This fix will take an estimated repair time of 1.0 hour.

The automobile fault code U129D has an estimated repair time of 1.0 hour.

The cost of fixing this fault code is influenced by the repair time.

Most auto repair shops charge between $75 and $150 per hour for their services. Therefore, the fixing cost of U129D will range between $75 and $150, depending on the repair time required.

It is important to consider the repair time and the hourly rate when estimating the fixing cost of this fault code.

The U129D code is a Diagnostic Trouble Code (DTC) that indicates a malfunction in the Precision All-Wheel Steer Control Unit.

The Powertrain Control Module (PCM) detects this malfunction when it does not receive signals from the Precision All-Wheel Steer Control Unit via the F-CAN lines for a set time. The Controller Area Network (CAN) transmitsreceives pulsing signals tofrom the control modules simultaneously by using two signal lines (F-CAN_H and F-CAN_L).

What are the possible causes of the u129d automobile fault code?

If you see the engine light on or the service engine soon warning light, it could be due to the u129d fault code. This code is usually caused by a faulty Precision All-Wheel Steer Control Unit, an open or shorted harness, a poor electrical connection in the circuit, or a faulty Powertrain Control Module. To fix this issue, you should visually inspect the related wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

How can I visually inspect the related wiring harness and connectors to fix the u129d fault code?

If you’re experiencing an Engine Light ON or Service Engine Soon Warning Light due to a u129d fault code, there are a few possible causes. One of them is a faulty Precision All-Wheel Steer Control Unit, which can be fixed by visually inspecting the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. Don’t forget to also check for open or shorted circuits and poor electrical connections.

Is a faulty Powertrain Control Module a common cause of the u129d fault code?

The u129d fault code, indicated by the engine light or service engine soon warning light, can be caused by a faulty Precision All-Wheel Steer Control Unit, an open or shorted harness, a poor electrical connection in the circuit, or a faulty Powertrain Control Module (PCM). To fix the issue, it is recommended to visually inspect the related wiring harness and connectors, check for damaged components, and look for broken, bent, pushed out, or corroded connector’s pins.

u129d error fault code explained

If you see the Engine Light ON or Service Engine Soon Warning Light, it could be due to a faulty Precision All-Wheel Steer Control Unit, open or shorted harness, poor electrical connection, or a faulty Powertrain Control Module (PCM). Check the possible causes, inspect the wiring harness and connectors, and look for damaged components or corroded pins.

Scroll to Top