Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

EVAP vent solenoid circuit failure. The vent solenoid (ACDelco) is located near the charcoal canister behind the rear axle. The solenoid corrodes from road salt and moisture exposure. Replace the solenoid and clean the vent filter. Check the connector for green corrosion and apply dielectric grease. Your dealer can confirm whether an open service bulletin or warranty extension applies to your VIN. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

The EVAP vent valve connector corrodes and loses connection. Check the wiring harness and connector before replacing the valve. Clean the connector pins with electrical contact cleaner and apply dielectric grease. If the solenoid tests bad (should have 20-30 ohms resistance), replace with an OE-quality ACDelco unit. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

The EVAP vent valve on Ram trucks is located near the fuel tank area. The wiring harness connector gets damaged by road debris. Check for 12V power and ground at the connector with the engine running. If the circuit is good, test the solenoid coil resistance (should be 20-35 ohms). Replace with an OE-quality Mopar unit if out of spec. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

The EVAP canister close valve (vent valve) on Toyota trucks gets clogged with dirt and debris from off-road driving. Located near the charcoal canister under the vehicle. Toyota part 90910-12276. Clean the vent filter screen first. If the valve tests bad electrically, replace it. Also inspect the EVAP hoses for rodent damage common on trucks.