What causes a P1246 code?

P1246 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 P1246 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1246 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

P1246

Cylinder 2: Injector spill valve short circuit across injector

What it means

The ECM has detected a short circuit condition specifically across the injector solenoid wires for Cylinder 2, meaning the electrical current is bypassing the intended resistance of the injector coil.