What causes a P1049 code?

P1049 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 P1049 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1049 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

P1049

Low error fault of FAFPD diagnosis in overrun

What it means

The Engine Control Module (ECM) detects that the fuel pressure in the rail is dropping lower than expected when the FAFPD valve is commanded to vent during an overrun (deceleration) condition.