What causes a P0724 code?

P0724 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 P0724 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0724 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

P0724

Brake Switch B Circuit High Signal Output

What it means

The Engine Control Module (ECM) or Transmission Control Module (TCM) detects an abnormally high voltage signal from the secondary brake light switch circuit, often indicating a stuck switch or shorted wiring.