What does a p2138 code mean on a 2009 impala?

A P2138 code on a 2009 Chevrolet Impala indicates a problem with the throttle/pedal position sensor. Specifically, it suggests that the sensor signals are inconsistent or out of range, which can affect the engine's performance and throttle response. This issue may lead to reduced engine power or trigger the check engine light. It’s recommended to inspect the throttle position sensor and related wiring for faults.