DTC P0719: TCC Brake Switch Circuit - Low Input: Description
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 Pontiac Grand Prix, 2002 Pontiac Bonneville, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, and 2002 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
The TCC brake switch indicates brake pedal status to the PCM. The TCC brake switch indicates that the brake pedal is either applied or released. The normally-closed switch supplies battery voltage to the PCM. Applying the brake pedal opens the TCC brake switch, interrupting voltage to the PCM. When the PCM receives zero volts at the TCC brake switch input, the PCM turns off the Torque Converter Clutch Pulse Width Modulation (TCC PWM) solenoid valve. DTC P0719 sets when the PCM detects an open brake switch (indicating pedal applied) during a number of accelerations.