Powertrain
Generic/SAE
OBD-II Fault Code
P0551: Power Steering Pressure Sensor Circuit Range/Performance
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P0551.
Steering system
Use this category to narrow your checks before replacing parts.
High
Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.
What P0551 usually means
Power Steering Pressure Sensor Circuit Range/Performance.
Common symptoms
Check Engine light; Poor drivability or reduced fuel economy depending on fault; Steering warning lamp or heavy/abnormal steering
Likely causes
Low voltage; Steering angle/torque sensor fault; Power steering motor/module issue; Wiring fault; Signal out of expected range; Mechanical issue affecting sensor reading; Slow/sticking actuator
Diagnostic checks
Scan all modules and record freeze-frame data before clearing codes; Check battery voltage and related fuses; Check battery/charging system; Calibrate steering angle sensor if required after repair/alignment; Compare live data to expected value and inspect mechanical operation
Repair guidance
Repair wiring/power supply, perform calibration, replace failed sensor/module after confirmation; Repair mechanical cause, clean/replace sticking actuator, or replace sensor after confirmation
Verification after repair
Clear code, road-test through the same drive condition, then rescan