Lost Communication With The Precision All Wheel Steer Control Unit
Table of contents
U129D Possible Causes
- Faulty Precision All-Wheel Steer Control Unit
- Precision All-Wheel Steer Control Unit harness is open or shorted
- Precision All-Wheel Steer Control Unit circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How do I fix code U129D?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the U129D code
The cost of diagnosing the U129D code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
- Engine Light ON (or Service Engine Soon Warning Light)
The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (F-CAN_H and F-CAN_L). When the Powertrain Control Module (PCM) does not receive the signals from the Precision All-Wheel Steer Control Unit via the F-CAN lines for a set time, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC).