OBD-II code · Network
U0420 Invalid Data Received from Power Steering Control Module
The Power Steering Control Module is present on the data bus but the values it reports are implausible — out of range, frozen, or failing the checksum or rolling-count check. The receiving modules reject the data. Power-steering assist may be reduced or disabled. Causes include a faulty sensor feeding the module, internal computation errors, a software or calibration mismatch after a repair, or bus interference corrupting the frames.
Is it safe to drive with U0420?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- PossibleEPS module internal fault
- PossibleCAN corruption causing checksum errors
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Power Steering Module, Can Bus Wiring
Related codes
- U0521Invalid Data Received from Power Steering Control Module
- U041DInvalid Data Received From Rocker Arm Control Module B
- U041EInvalid Data Received From All Wheel Drive Control Module
- U041FInvalid Data Received From Throttle Actuator B Control Module
- U0421Invalid Data Received from Throttle/Pedal Position Sensor
- U0422Invalid Data Received from Body Control Module
- U0423Invalid Data Received from Information Center
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.