U0420
Invalid Data Received From Power Steering Control Module A
U0420 is an OBD-II diagnostic trouble code meaning: Invalid Data Received From Power Steering Control Module A. Common causes: eps control module malfunction, problems with wiring or connectors. Estimated repair cost: $17–111.
Symptoms
- Check engine light is on
- Increased steering effort
- Intermittent operation of the electric power steering
- Loss of parking assistance functions
Causes
- EPS control module malfunction
- Problems with wiring or connectors
- EPS module power problems
- CAN bus fault
- Software error in EPS module
How to Fix
- Check EPS module fault codes
- Inspect EPS module connectors and wiring
- Check the power and ground of the EPS module
- Check communication via CAN bus
- Update EPS module software
Related codes
Error U0420 by Vehicle Brand
FAQ
What does the U0420 code mean?
U0420 is an OBD-II diagnostic trouble code that indicates: Invalid Data Received From Power Steering Control Module A
What causes a U0420 error code?
The most common causes of U0420 include: EPS control module malfunction; Problems with wiring or connectors; EPS module power problems; CAN bus fault.
How do I fix a U0420 diagnostic trouble code?
To fix U0420: Check EPS module fault codes. Inspect EPS module connectors and wiring. Check the power and ground of the EPS module. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0420?
Limited driving only, diagnose soon
How much does it cost to fix U0420?
The estimated repair cost for U0420 is $17–111. Actual cost depends on your vehicle, location, and labor rates.
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