P2164 indicates that the engine control module has detected a performance problem with the maximum stop position of throttle pedal position sensor B. The sensor’s signal does not reach the expected voltage or resistance range when the pedal is fully released or fully depressed.
The sensor element or its internal circuitry fails to produce the correct voltage at the maximum stop position.
Open circuits, shorted wires, or high resistance in the sensor harness prevent accurate signal transmission.
Physical obstruction or worn pivot points keep the pedal from reaching its true mechanical stop.
If the throttle body does not move to its full closed/open position, the sensor’s reference values become inconsistent.
Rare; an outdated or corrupted control module calibration can misinterpret a valid sensor signal.
No. The PCM is rarely the root cause; the fault is most often the sensor itself, its wiring, or a mechanical issue with the pedal.
The vehicle may enter a reduced‑power or limp mode, making normal driving unsafe. It should be diagnosed and repaired promptly.
Cleaning the throttle body addresses throttle‑body related codes, but P2164 is specific to the pedal position sensor B circuit; cleaning alone will not resolve it unless the throttle body is mechanically preventing the pedal from reaching its stop.
Cost varies widely by vehicle and labor rates; the repair generally involves sensor replacement and wiring inspection rather than control module replacement.