What causes a P1093 code?

P1093 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 P1093 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1093 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

P1093

P1093 - Fuel Rail Pressure Low During Power Enrichment

What it means

Indicates the Electronic Control Module (ECM) detected that actual fuel rail pressure was significantly lower than commanded pressure during high-load or full-throttle operation. This typically points to a fuel delivery insufficiency or a high-pressure leak.