P1426
Tank Ventilation Valve Open Circuit
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Check Engine Light Is On
- Difficulty filling the fuel tank
- Hissing noise when opening the gas cap
- Slight deterioration in vehicle dynamics
- Increased fuel consumption
Causes
- Broken wires to the ventilation valve
- Oxidation or corrosion of connector contacts
- Malfunction of the solenoid valve itself
- Damage to the EVAP system wiring harness
- Problems with the engine control unit
How to Fix
- Visual inspection of valve wiring and connectors
- Checking the valve winding resistance with a multimeter
- Checking the voltage supply to the valve
- Replacing a faulty tank ventilation valve
- Repair or replace damaged wiring