Power Steering Control Module Communication Fault
Communication failure between the power steering control module and the vehicle's network.
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What it means (plain English)
The power steering module isn't able to talk to the car's computer, which can make steering feel heavy or unresponsive.
What the computer is actually seeing
The control module detects no signal from the power steering module for a set period, indicating a failure in communication.
What a healthy reading looks like
The expected communication voltage levels should be between 0.5V and 2.5V on the CAN bus; a steady voltage outside this could indicate a fault.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the power steering control module wiring harness for visible damage or corrosion.
- 22. Verify the connectors are secure and free of corrosion, ensuring a good electrical connection.
- 33. Check the vehicle battery voltage; it should be between 12.4V and 12.8V with the engine off.
- 44. Use a scan tool to check for any other related fault codes that could indicate a broader network issue.
- 55. Monitor the communication signals on the CAN bus with a scope; expect readings between 0.5V and 2.5V during operation.
- 66. If the power steering control module is still unresponsive, consider testing or replacing the module.
Common causes
- Faulty power steering control module
- Wiring issues or damaged connectors
- Corrosion on pins or connectors
- Faulty vehicle network (CAN bus) issues
- Low battery voltage affecting module operation
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but steering may be heavier than usual, so exercise caution.
Will this code come back after clearing?
If the underlying issue is unresolved, yes, it will likely return.
Why does this code pair with others like C1540?
These codes often indicate different aspects of communication failures in the steering and vehicle control systems.
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