P0724 Torque Converter/Brake Switch B Circuit High

P0724 points to a high signal in the torque converter or brake switch B circuit. The brake-related input is higher than expected or stuck active.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace torque-converter parts until the brake input circuit has been tested electrically.

Symptoms of P0724

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0724

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Compare brake switch B status with pedal movement, stop lamps, cruise cancel, and torque-converter clutch release command.
Check for short-to-voltage faults, incorrect switch adjustment, damaged pedal wiring, connector corrosion, and module input faults.
Review whether converter clutch operation, cruise control, or shift interlock symptoms line up with the high input.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.