What causes a P1048 code?

P1048 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 P1048 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1048 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

P1048

High error fault of FAFPD diagnosis in overrun

What it means

High error fault of FAFPD (Fuel Accumulator Fuel Pressure) diagnosis in overrun. This indicates the fuel rail pressure is higher than expected when the engine is in a coasting/deceleration state.