What causes a P1650 code?

P1650 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 P1650 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P1650 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

P1650

Red stop lamp driver open circuit

What it means

P1650 indicates the Engine Control Module (ECM) has detected an open circuit (no continuity) on the output line responsible for illuminating the red 'Stop Engine' lamp on the dashboard.