What causes a P0719 code?

P0719 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 P0719 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0719 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

P0719

Brake Switch B Circuit Low Input

What it means

The Engine Control Module (ECM) or Transmission Control Module (TCM) detects a low voltage signal or a short to ground in the brake switch 'B' secondary circuit. This circuit validates the primary brake switch for cruise control cutout and torque converter clutch release.