EVAP Purge Control Valve Circuit Shorted
The P0445 code indicates a short circuit in the evaporative emission control system purge control valve circuit. This valve regulates the flow of fuel vapors from the charcoal canister to the engine intake. A short circuit can cause the valve to malfunction, leading to improper purge operation and potential fuel vapor leaks.
1. Most Common Causes
- Faulty EVAP purge valve with internal short circuit
- Short to voltage in the purge valve wiring harness
- Short to ground in the purge valve wiring harness
- Corroded, damaged, or bent pins in the electrical connector
- Open circuit in the control or power supply wiring
- Failed power driver inside the ECM
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible rough idle or poor fuel economy
- Fuel smell from engine bay
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect purge valve wiring and connector for damage, corrosion, or shorts.
Step 3: Disconnect purge valve connector and measure resistance across valve terminals; should be 20-30 ohms. If out of range, replace valve.
Step 4: Check for battery voltage at the connector with key on; if no voltage, check fuse and wiring.
Step 5: Test purge valve operation using a scan tool command; listen for clicking sound.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause rough idle, poor fuel economy, and increased emissions. It's best to repair promptly to avoid potential drivability issues.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the cause. A purge valve replacement costs around $30-$80, plus diagnostic time.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.