What causes a P1216 code?

P1216 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 P1216 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1216 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

P1216

Cylinder 6: Injector needle valve low side short circuit to battery voltage

What it means

The Engine Control Module (ECM) has detected that the return circuit (low side) for injector #6 is receiving voltage when it shouldn't, typically indicating a short to the positive battery circuit.