The engine control module (ECM) has detected that the voltage signal from the throttle position sensor is higher than the calibrated maximum. This indicates an electrical fault in the sensor circuit, preventing the ECM from accurately determining the throttle plate position.
Internal failure of the sensor or a short within the potentiometer causing an out-of-range voltage signal.
Frayed, pinched, or melted wires causing a short to a power source or an open circuit.
Moisture or corrosion at the sensor plug creating high resistance or signal bridging.
A stuck or damaged throttle plate that forces the sensor beyond its normal operating voltage.
A failure in the control module's signal processing circuit, though this is rare compared to sensor or wiring failures.
While carbon buildup can cause poor idling, P2622 is typically an electrical signal fault. Cleaning the body may help with performance, but it rarely fixes a 'circuit high' electrical code.
No. Most P2622 issues are caused by wiring faults or poor grounding. The PCM should only be considered after a complete point-to-point wiring verification has been performed.
The vehicle may enter a reduced-power mode to prevent unintended acceleration, which can be dangerous in highway traffic. It is recommended to diagnose the fault promptly.