Your car's fuel vapor escape valve is stuck or not responding properly, like a clogged drain that can't let steam out of a pot. The engine computer detected the vent control circuit isn't working as expected.
The ECM monitors the vent solenoid valve circuit for proper voltage and resistance when activated. It checks that the valve opens and closes on command by measuring circuit continuity and voltage drop across the solenoid coil. If the signal doesn't match expected behavior within a specific timeframe, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Vent solenoid coil resistance | 10-14 ohms | Open circuit (∞) or short (<5 ohms) |
| Solenoid response time | 100-500 milliseconds activation | No response or delayed >1 second |