Code Definition

P0468 — Purge flow Sensor Circuit High Input

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

About P0468

P0468 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 P0468 is stored, the module has detected a signal or supply voltage lower than the expected operating range; a signal or supply voltage higher 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 P0468 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

This code is set when the powertrain control module (PCM) detects that the purge flow sensor is sending a voltage signal higher than the expected range. This typically indicates a short to power, an open circuit, or a faulty sensor, leading to inaccurate monitoring of the evapourative emissions (EVAP) purge flow.

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