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P0467EVAP Purge Flow Sensor Circuit Low

The EVAP purge flow sensor signal is stuck below its normal operating range, usually from a short to ground or a failed sensor.

Definition

The PCM monitors the purge flow sensor's signal voltage and sets P0467 when it falls below the minimum plausible threshold — typically the signal wire shorted to ground, a failed sensing element, or a lost reference voltage. With the signal pegged low, the PCM cannot verify purge flow, so the MIL illuminates and the EVAP monitor is suspended; driveability is normally unaffected, but the vehicle will not pass a readiness-based emissions inspection until repaired.

Common causes

  • Signal wire chafed and shorted to ground
  • Failed purge flow sensor with an internally shorted element
  • Open or shorted 5 V reference feed to the sensor
  • Water or fuel intrusion in the sensor connector
  • Damaged harness section near hot or moving components
  • Faulty PCM input circuit pulling the signal low (rare)

Common misdiagnoses

  • Purge solenoid replaced for a sensor-signal circuit fault
  • Gas cap or EVAP leak repairs performed for an electrical low-signal code
  • PCM replaced before checking for a harness short to ground
  • Charcoal canister replaced when the sensor or wiring failed

Troubleshooting steps

  1. 1.Check the signal voltage at the sensor

    Backprobe key-on: a signal at or near 0 V with a good 5.0 V reference present points to a shorted signal circuit or dead sensor.

  2. 2.Verify the 5 V reference and ground

    Missing reference voltage means an upstream harness fault or another shorted sensor on the same reference circuit dragging it down.

  3. 3.Unplug the sensor and watch the PID

    If the signal voltage rises to the PCM's bias value when disconnected, the sensor is internally shorted; if it stays at 0 V, the harness is shorted to ground.

  4. 4.Test the signal wire for a short to ground

    With sensor and PCM disconnected, resistance from the signal wire to chassis ground should read OL.

  5. 5.Replace the sensor or repair the harness

    Fix whichever failed, protecting repaired wiring at the chafe point with loom or tape.

  6. 6.Clear the code and confirm operation

    Verify the flow signal responds proportionally when purge is commanded and the code stays clear through a full drive cycle.

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