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 purging of vapors, which may trigger the check engine light and affect emissions.
01. Most Common Causes
- Shorted purge control valve solenoid
- Damaged wiring or connector in the purge valve circuit
- Faulty engine control module (ECM)
02. Symptoms You Will Notice
- Check engine light illuminated
- Possible rough idle or poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the purge valve wiring and connector for damage or corrosion.
Step 3: Test the purge valve solenoid resistance with a multimeter (specs vary, typically 10-30 ohms).
Step 4: Check for short to ground or power in the circuit using a multimeter.
Step 5: If wiring and valve are good, test the ECM output signal.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but it may cause increased emissions and reduced fuel economy. Have it repaired soon.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the cause.