What causes a P0589 code?

P0589 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 P0589 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0589 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

P0589

P0589 Multi-Function Input B Cruise Control Circuit

What it means

The Engine Control Module (ECM) has detected an open, short, or voltage irregularity within the cruise control secondary input switch circuit.