my Ram 1500 DT (2019-Present) has a P0455 code, how can I fix this?

Learn how to diagnose and fix P0455 large leak in the EVAP system of your Ram 1500 DT. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery for safety.

2. Inspect and Replace Gas Cap

• Tools Required: None
• Sub-steps:
  1. Remove the gas cap and inspect for cracks or damage.
  2. If damaged, replace with a new gas cap ensuring it meets OEM specifications.
  3. Reinstall the gas cap and ensure it clicks securely.

3. Check and Repair EVAP Hoses

• Tools Required: Pliers, hose clamps (if needed)
• Sub-steps:
  1. Inspect all EVAP hoses for cracks or disconnections.
  2. Replace any damaged hoses with OEM parts.
  3. Secure hoses with clamps if they were loose.

4. Perform Smoke Test

• Tools Required: Smoke machine
• Sub-steps:
  1. Connect the smoke machine to the EVAP system service port.
  2. Introduce smoke and observe for leaks.
  3. Repair any identified leaks by replacing damaged components.

5. Inspect and Replace Purge and Vent Valves

• Tools Required: Multimeter, socket set
• Sub-steps:
  1. Disconnect electrical connectors from the purge and vent valves.
  2. Test the valves with a multimeter for proper operation.
  3. If faulty, remove and replace with OEM parts.
  4. Reconnect the electrical connectors.