why does my Ram 1500 DT (2019-Present) have a check engine light with code P0441?

Learn how to diagnose and fix P0441 EVAP system issues in 2019 Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, multimeter, smoke machine, replacement gas cap (if needed), and any required EVAP system components.
• Ensure the vehicle is parked on a level surface with the engine off and cooled down.

2. Inspect and Replace Gas Cap

• Remove the gas cap and inspect it for any damage or debris.
• If damaged, replace the gas cap with a new one. Ensure it clicks securely when installed.

3. Inspect EVAP Lines and Hoses

• Locate the EVAP lines and visually inspect for any cracks, loose connections, or signs of wear.
• If any hoses are damaged, replace them with OEM or high-quality aftermarket parts.

4. Test and Replace EVAP Purge Valve

• Disconnect the electrical connector and vacuum line from the EVAP purge valve.
• Use a multimeter to test the valve's resistance according to the specifications found in the service manual.
• If the valve is faulty, replace it with a new one, reconnect the vacuum line and electrical connector.

5. Check and Clean EVAP Canister

• Locate the EVAP canister and inspect it for damage or blockage.
• If necessary, remove the canister and clean it with appropriate solvents to remove blockages, or replace it if damaged.

6. Clear Codes and Verify Repair

• After making the repairs, use the OBD-II scanner to clear the P0441 code.
• Start the engine and allow it to idle for a few minutes to monitor for the check engine light returning.