What causes a P1122 code?

P1122 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 P1122 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1122 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

P1122

Sticking cruise fault

What it means

P1122 indicates that the Engine Control Module (ECM) has detected the Cruise Control Set/Resume switch signal is active (High) for an extended period of time while driving.