P0124 - Throttle/Pedal Position Sensor/Switch 'A' Circuit Intermittent

P0124 is a diagnostic trouble code (DTC) that indicates the Engine Control Unit (ECU) has detected an intermittent signal from the Throttle Position Sensor (TPS) or Accelerator Pedal Position (APP) sensor 'A'. The ECU provides a 5V reference signal to the sensor, and the return signal should vary smoothly based on throttle angle (typically 0.5V to 4.5V). When the ECU sees erratic voltage spikes or drops that do not follow the actual physical movement of the throttle, it triggers this code. Because the throttle position is critical for torque management and safety, the vehicle will often enter a reduced power mode (Limp Mode) to prevent unintended acceleration.