What causes a P1205 code?

P1205 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 P1205 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1205 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

P1205

Cylinder 5: Injector needle valve open circuit

What it means

The ECM has detected zero current flow (an open circuit) when attempting to command the Cylinder 5 fuel injector, indicating the electrical path is broken.