Possible causes

– Faulty Brake Switch
– Brake Switch harness is open or shorted
– Brake Switch circuit poor electrical connection
– Misadjusted Brake Switch

When is the code detected?

The stop light switch does not turn off even once vehicle is driven.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Stop lights may be inoperative

P0724 BUICK Description

The brake switch indicates brake pedal status to the Powertrain Control Module (PCM). The brake switch is a normally-closed switch that supplies battery voltage on circuit 420 to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. When the brake pedal is released, the PCM receives a constant voltage signal. If the PCM receives a zero voltage signal at the brake switch input, and the torque converter clutch (TCC) is engaged, the PCM de-energizes the TCC solenoid valve. The PCM disregards the brake switch input for TCC scheduling if there is a brake switch circuit fault.