Error code
OBD2 U0420
OBD2U0420
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Invalid Data Received From Power Steering Control Module.
Severity
moderateThe car is generally still drivable, but you may experience issues with the power steering system.
Summary
U0420 indicates that the power steering control module is sending invalid data to other modules in the car. This code affects the communication between the power steering system and other vehicle systems.
Common Causes
- Faulty or damaged wiring harness connecting the power steering control module
- Malfunctioning power steering control module itself
Fixes
- Inspect and repair or replace any faulty wiring harness connecting to the power steering control module.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
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- U0406Invalid Data Received From Fuel Injector Control Module
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- U0410Invalid Data Received From Fuel Pump Control Module
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