What Does P1425 Mean?
The PCM has detected that the EVAP tank ventilation valve (canister vent valve) control circuit is shorted to ground. This prevents proper control of fuel vapor venting from the charcoal canister.
Common Causes
40%
Damaged wiring harness with insulation worn through grounding on chassis
30%
Failed canister vent valve solenoid with internal short to ground
15%
Corroded connector terminals causing ground short
10%
Water or contamination inside vent valve causing electrical short
5%
PCM internal driver circuit failure
Diagnostic Steps
1
Step 1: Disconnect canister vent valve connector and measure resistance between control circuit pin and ground - should be infinite (open)
2
Step 2: Inspect wiring harness from PCM to vent valve, especially where harness routes near exhaust or suspension components
3
Step 3: With valve disconnected, check resistance from PCM connector to ground on control wire - should read open circuit
4
Step 4: Measure resistance across vent valve solenoid terminals - typically 20-40 ohms; check for resistance to valve body ground
5
Step 5: If wiring checks normal, replace vent valve; if short remains with valve disconnected, repair harness or check PCM
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The PCM has detected that the EVAP tank ventilation valve (canister vent valve) control circuit is shorted to ground. This prevents proper control of fuel vapor venting from the charcoal canister.
The most common cause of P1425 (Tank Ventilation Valve Short To Ground) is: Damaged wiring harness with insulation worn through grounding on chassis
Typical repair costs for P1425 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may notice fuel odor if canister cannot vent properly. May cause difficulty refueling or fuel tank pressure issues in some cases.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1425 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emissions System
Difficulty
Type
Manufacturer
Recommended Tools
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