Evaporative Emission Control System Purge Control Valve Circuit Shorted
What does P0445 mean?
The P0445 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission Control System Purge Control Valve Circuit Shorted. This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- Fuel vapor smell near the engine
- Possible rough idle or hesitation
- Failed emissions inspection
Probable Causes (Ranked by Likelihood)
- Short circuit in purge valve wiring harness Very High
- Internally shorted purge control solenoid High
- Wiring harness chafing against metal components Moderate
- Faulty ECM/PCM purge valve driver Low
Step-by-Step Diagnostic Procedure
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Inspect purge valve wiring for chafing, melted insulation, or bare wires touching ground
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Disconnect the purge valve and measure resistance -- a reading significantly below 20 ohms suggests an internal short
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Check for short to ground on the purge valve signal wire using a multimeter
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Wiggle the wiring harness while monitoring live data to detect intermittent shorts
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If wiring checks good, test with a known-good purge valve solenoid
Frequently Asked Questions
Can I drive with code P0445?
Yes. This electrical circuit code does not impact drivability. However, a shorted circuit can potentially blow a fuse or damage the ECM driver over time, so repair is recommended.
What is the difference between P0444 and P0445?
P0444 indicates an open circuit (broken wire or disconnected connector), while P0445 indicates a short circuit (wire touching ground or power, or an internally shorted solenoid).
Can a shorted purge valve damage the ECM?
In rare cases, a persistent short circuit can damage the ECM driver transistor. Prompt repair prevents more costly ECM damage.