P0467: Purge Flow Sensor Circuit Low Input
The P0467 code indicates that the Engine Control Module (ECM) has detected a low voltage signal from the purge flow sensor circuit in the evaporative emission (EVAP) system. This sensor monitors the flow of fuel vapors from the charcoal canister to the intake manifold during purge operation. A low input typically means the signal voltage is below the expected range, often due to a faulty sensor, wiring issues, or a short circuit. This can prevent proper EVAP system operation, potentially causing increased emissions and fuel smell.
1. Most Common Causes
- Faulty purge flow sensor
- Short to ground in the sensor wiring
- Corroded or poor connection at the sensor connector
- Open circuit in the sensor signal wire
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible fuel odor
- Rough idle or hesitation during purge
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify P0467 and check freeze frame data.
Step 2: Visually inspect the purge flow sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage reference and ground circuits with a multimeter.
Step 4: If circuits are okay, test the purge flow sensor output signal while commanding purge operation.
Step 5: Replace the purge flow sensor if it fails the signal test; otherwise, repair wiring as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause increased emissions and potential fuel smell. It's best to diagnose and repair soon to avoid failing an emissions test.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the sensor cost and accessibility.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.