Code Definition

P0220 — Throttle / Pedal Position Sensor / Switch B Circuit

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0220

P0220 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0220 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0220 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

Electronic throttle control systems use two independent position sensors at the accelerator pedal, and commonly two more at the throttle body, so the ECM can continuously compare one against the other and detect a failure that a single sensor could never reveal. Sensor B is the redundant partner to sensor A, and on most designs it either runs at a different slope, typically reading around half the voltage of A at any given position, or sweeps in the opposite direction, so that a common fault affecting both conductors cannot produce a plausible pair of readings. P0220 sets when the ECM detects ...

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