DTC Troubleshooting: P2421 (1.5L Engine): Notes

DTC P2421  : Evaporative Emission (EVAP) Canister Vent Shut Valve Stuck Open

Special Tools Required 

Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000B or equivalent, commercially available 

How to use this service information .

NOTICE: 

• Before you troubleshoot, review the How to Troubleshoot - Refer to: How to Troubleshoot the Fuel and Emissions Systems (1.5L Engine) or How to Troubleshoot the Brake Booster Pressure Monitoring System or How to Troubleshoot the Fuel and Emissions Systems(2.0L Engine) (2024 2025) or How to Troubleshoot the CVT System .
• The fuel system is designed to allow specified maximum vacuum and pressure conditions. Do not deviate from the vacuum and pressure tests as indicated in these procedures. Excessive pressure/vacuum would damage the EVAP components or cause eventual fuel tank failure.

NOTE:  Fresh fuel has a higher volatility that will create greater pressure/vacuum. The best condition for testing is less than a full tank of fresh fuel. If possible, to assist in leak detection, add 1 gallon of fresh fuel to the tank (as long as it will not fill the tank), just before starting these procedures.