Code
P0467
GWM
P — Powertrain
- Low Purge Flow Sensor
AI status
Completed
Completed
100%
Causes
- Open or short in purge flow sensor wiring
- Poor connector or corroded terminal at the sensor
- Faulty purge flow sensor (internal failure)
- Stuck/blocked EVAP purge valve or hoses restricting flow
- Vacuum leak or blocked charcoal canister line
- PCM/ECM hardware or software fault (rare)
Symptoms
- Malfunction Indicator Lamp (MIL) ON
- Failed or incomplete EVAP system readiness/test
- Possible rough idle or hesitation during purge events
- Poor fuel economy or increased emissions
- Evap-related drivability faults under certain conditions
What to check
- Scan for current and pending DTCs and read freeze-frame data
- Visually inspect purge flow sensor connector and wiring for damage or corrosion
- Backprobe sensor power, ground and signal circuits with key on to verify reference voltage and continuity
- Command purge ON with a scan tool and observe sensor signal response
- Verify purge valve operation (apply vacuum or use scan tool to actuate) and inspect hoses for blockages
- Perform a smoke test of the EVAP plumbing to find leaks or restrictions
Signal parameters
- Reference supply: typically 5 V reference from PCM (verify vehicle-specific)
- Signal at no purge/idle: near 0 V or low-level output (sensor-dependent)
- Signal during commanded purge: signal should rise/increase proportionally (commonly 0.5–4.5 V range) or produce an increased frequency/pulse rate for frequency-type sensors
- Expected continuity: sensor ground to chassis < 1 ohm; reference supply to PCM ~5 V with key ON
- If sensor uses switched 12 V supply, check for battery voltage on the supply pin with key ON/engine OFF
Diagnostic algorithm
- Retrieve all DTCs and freeze-frame; note conditions when code set (engine temp, rpm, commanded purge state).
- Visually inspect harness and connector at the purge flow sensor for corrosion, bent pins, or damage. Repair as needed.
- Backprobe sensor connector: verify reference voltage (usually 5 V), good ground, and signal level with key ON/engine OFF. Compare to expected values.
- With a scanner, command the purge valve ON while monitoring the purge flow sensor signal. If signal does not change, proceed to wiring and valve checks.
- Check continuity and resistance of signal, reference and ground circuits from sensor to PCM. Repair any opens/shorts.
- Verify purge valve can open (apply vacuum or use scan tool); inspect hoses and canister lines for blockage or collapse. Replace or clear restrictions.
- If wiring and valve are OK but sensor signal remains low, substitute a known-good sensor or bench-test sensor per manufacturer procedure.
- If replacement sensor corrects signal, reassemble, clear codes and perform drive cycle to confirm code does not return.
- If wiring, sensor and purge valve test good, consider PCM diagnostic/repair or consult manufacturer technical service info before replacement.
Likely causes
- Damaged sensor harness (chafing, disconnected, pinched)
- Corroded connector at purge flow sensor
- Purge flow sensor failed and reporting near 0 V/frequency
- Purge solenoid stuck closed preventing measurable flow
- Blocked/crushed vacuum/EVAP hose between canister and intake
- Aftermarket parts or recent service disturbed wiring/hoses
Fault status
Status
P0467 – Evaporative (EVAP) purge flow sensor low input. PCM detected an abnormally low or absent purge flow/signal when purge was expected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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