What causes a U0589 code?

U0589 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 U0589 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with U0589 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

U0589

Network/CAN bus communication code U0589

What it means

Invalid data received from the DCU (Dosing Control Unit) or Reductant Control Module. This indicates the ECM cannot trust the reductant injection data.