P2164: Throttle/Pedal Position Sensor B Maximum Stop Performance

What does P2164 mean?

P2164 is the full-travel test for position signal B. When the throttle or pedal is held at its upper stop, sensor B has to report a value inside a calibrated band; a reading or learned maximum outside that band sets the code. Ford and GM call their second throttle body sensor B, so on those designs the code points at the throttle body, yet no manufacturer documents P2164 publicly. The nearest evidence is Ford's listing of the A version P2163 and a Visteon patent that learns the open stop and rejects values beyond about 80 to 110 degrees. On many throttle bodies the second track runs opposite to the first, so comparing A and B at full opening helps to tell a sensor fault from a mechanical block. P2113 checks the closed stop of B; P0220-P0223 cover its circuit.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Engine warning lamp on
• Power limited at high throttle demand
• Occasional limp mode

Common causes

• High Sensor B track worn or drifted at the full-open end
• Medium Deposits or a damaged stop limit the plate travel
• Medium Corroded contact on the sensor B signal or reference pin
• Low End positions not relearned after part replacement

Likelihood is a general estimate across vehicles; your make and model may differ.