What causes a P1202 code?

P1202 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 P1202 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1202 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

P1202

Cylinder 1: Injector needle valve short circuit across injector

What it means

The Engine Control Module (ECM) has detected an Electrical Short Circuit within the Cylinder 1 injector circuit, specifically indicating a low resistance path across the injector coil.