U0131 U0xxx · Network (U) High severity
Lost Communication with Power Steering Control Module
The steering control module is not responding. Assist usually drops to a reduced default rather than disappearing entirely.
Severity guidance: High — stop driving and diagnose now; risk of further damage
Symptoms you will notice
- Heavy steering
- Power steering warning lamp
- Steering assist inconsistent
Common causes
Ordered from most to least likely — start at the top.
- 1 Steering module supply or earth fault
- 2 CAN fault
- 3 Failed module
- 4 Coding lost after replacement
How to diagnose it
Cheapest and least invasive first — most of these codes are not a parts problem.
- ✓ Check the high-current supply and earth to the steering rack.
- ✓ Measure CAN at the steering connector.
- ✓ Read the module directly with the scan tool.
- ✓ Check coding status if the module was recently replaced.
Repair options
- Repair the supply or earth
- Repair the CAN wiring
- Replace and code the module
U0131 — frequently asked questions
Will the steering lock up? +
Almost never. Systems default to reduced or zero assist, which is heavy but controllable.
Why does it come back after restarting? +
A marginal supply or connector. Intermittent faults still need fixing before they become permanent.
Confirm the diagnosis before you buy parts
Send us the code, freeze-frame data and the vehicle — our engineers will tell you what to test first.