Code Definition

P0222 — Throttle / Pedal Position Sensor / Switch B Circuit Low Input

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

About P0222

P0222 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 P0222 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and 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 P0222 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

Sensor B is the redundant partner to sensor A in an electronic throttle control system, supplied with a 5V reference and returning a signal the ECM compares against A to validate driver demand. Depending on the design, sensor B either runs at an offset slope reading roughly half the voltage of A, or sweeps inversely so that it falls as A rises, which means the normal resting voltage for B differs considerably between systems. P0222 sets when the ECM measures sensor B signal voltage below its minimum acceptable threshold for a calibrated period, a value lower than the sensor can legitimately pr...

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