What causes a P1051 code?

P1051 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 P1051 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1051 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

P1051

SFS Preheat Plausibility fault

What it means

The ECM has detected that the Smart Fuel Sensor (SFS) / Fuel Preheater is not functioning within its expected electrical parameters or is not responding correctly to a heating command.