What causes a P0551 code?

P0551 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P0551 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0551 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P0551

Power Steering Pressure Sensor Range Performance

What it means

The Engine Control Module (ECM) has detected an irrational signal from the power steering pressure (PSP) sensor that does not match expected engine load or speed conditions.