What causes a P1301 code?

P1301 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 P1301 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1301 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

P1301

Intermittent misfire cylinder 1

What it means

Intermittent misfire detected specifically in Cylinder 1. The ECM has detected a variation in crankshaft speed or injector current that indicates Cylinder 1 is not contributing consistently to engine power.