What causes a P1305 code?

P1305 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 P1305 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1305 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

P1305

Intermittent misfire cylinder 2

What it means

P1305 indicates that the Engine Control Module (ECM) has detected an intermittent loss of combustion or a mechanical imbalance specifically in cylinder number 2.