What Does P0445 Mean?
The PCM has detected a short circuit in the EVAP purge control valve wiring. This valve controls the flow of fuel vapors from the charcoal canister to the intake manifold for combustion. The driver may notice a check engine light with possible fuel odor near the vehicle, and the EVAP system self-test will fail.
Common Causes
35%
Shorted wiring harness to purge control valve (chafed insulation contacting ground or power)
30%
Internally shorted purge control solenoid valve
20%
Corroded or damaged electrical connector at the purge valve
10%
PCM driver circuit failure for purge valve output
5%
Water intrusion into harness or connector causing short
Diagnostic Steps
1
Using a multimeter, measure the resistance across the purge solenoid connector terminals (disconnected from harness). A good solenoid typically reads 20-40 ohms; an internal short will read near 0 ohms.
2
With the solenoid disconnected, check the harness side for shorts: measure resistance from each wire to chassis ground. Any reading below 10K ohms indicates a harness short to ground.
3
Measure from each harness wire to battery positive to check for a short to power. Should read OL (open line).
4
Visually inspect the entire wiring run from the PCM connector to the purge valve for chafed, melted, or pinched wiring, especially near exhaust components and sharp edges.
5
If wiring checks good, use a lab scope or multimeter to verify the PCM is outputting the correct ground-side switching signal (duty-cycle controlled PWM) at the PCM connector pin.
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
The PCM has detected a short circuit in the EVAP purge control valve wiring. This valve controls the flow of fuel vapors from the charcoal canister to the intake manifold for combustion. The driver may notice a check engine light with possible fuel odor near the vehicle, and the EVAP system self-tes...
The most common cause of P0445 (Evaporative Emission Control System Purge Control Valve Circuit Shorted) is: Shorted wiring harness to purge control valve (chafed insulation contacting ground or power)
Typical repair costs for P0445 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. This is an emissions-related code and does not affect drivability or safety. However, fuel vapors may vent to atmosphere, so repair promptly to pass emissions testing and reduce environmental impact.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0445 to identify the root cause.
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Quick Info
Category
Powertrain
System
EVAP / Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
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