What causes a P0573 code?

P0573 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 P0573 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0573 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

P0573

Brake Switch A Circuit High

What it means

This fault indicates that the Engine Control Module (ECM) is detecting a signal voltage from the brake switch circuit that is higher than the expected calibrated range.