P2125 indicates a malfunction in the 'E' circuit of the throttle/pedal position sensor, which is part of the accelerator pedal assembly. This code means the engine control module (ECM) has detected an abnormal voltage or signal from the sensor circuit, often leading to reduced engine power or limp-in mode.
The sensor inside the pedal assembly is the most common failure. It can wear out or develop internal shorts, causing incorrect voltage signals on the 'E' circuit.
Chafed, broken, or corroded wires in the pedal sensor harness, or loose/dirty connector pins, can disrupt the circuit and trigger the code.
A weak ground or intermittent connection at the sensor or ECM can cause voltage fluctuations that set the code.
In very rare cases, a fault in the engine control module itself may cause this code. However, ECM failure is uncommon and should only be considered after thoroughly checking the sensor and wiring.
You may be able to drive short distances, but the vehicle will likely enter a reduced-power limp mode. Continued driving could be unsafe if the throttle response is unpredictable. It's best to diagnose and repair promptly.
No. The throttle position sensor is on the throttle body, while the accelerator pedal position sensor is on the pedal assembly. P2125 refers to the pedal sensor circuit, not the throttle body sensor.
Almost never. The ECM is rarely the cause of P2125. Most cases are due to a faulty pedal sensor, wiring issues, or poor connections. Replacing the ECM should be a last resort after thorough diagnosis.