What causes a P1218 code?

P1218 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 P1218 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1218 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

P1218

Cylinder 2: Injector needle valve short circuit across injector

What it means

The ECM detects a short circuit condition specifically across the solenoid of the fuel injector for cylinder number 2. This prevents the ECM from being able to control fuel delivery for that cylinder.