What does code P2129 mean?

DTC codes / P21xx · Fuel and air metering / P2129

P2129Throttle/Pedal Position Sensor/Switch 'E' Circuit Intermittent

P2129 means the engine computer has detected an intermittent electrical fault in the Throttle/Pedal Position Sensor/Switch 'E' circuit, which is a secondary sensor track used to cross-check the main pedal or throttle position signal. The computer monitors this circuit for brief dropouts, spikes, or erratic voltage changes and sets the code when the signal becomes unreliable for a fraction of a second.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.