OBD-II code · Network
U0521 Invalid Data Received from Power Steering Control Module
Other modules receive implausible EPS torque or angle data. EPS reduces or disables assist; the EPS warning lamp comes on.
Is it safe to drive with U0521?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- PossibleTorque sensor drift
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
- 0.5–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Eps Module
Related codes
- U0420Invalid Data Received from Power Steering Control Module
- U0518Invalid Data Received From Door Switch C
- U0519Invalid Data Received From Door Switch D
- U051AInvalid Data Received From Door Switch E
- U0522Invalid Data Received From Door Switch G
- U0523Invalid Data Received From Door Window Motor A
- U0524Invalid Data Received From Door Window Motor B
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.