What causes a P1304 code?

P1304 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 P1304 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1304 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

P1304

Intermittent misfire cylinder 6

What it means

The ECM has detected a recurring but non-constant loss of power contribution from cylinder number 6, usually associated with PACCAR or Cummins engines found in Peterbilt trucks.