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How to fix the P0455 code?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

P0455 is an OBDII trouble code that indicates a leak in the evaporative emission control system (EVAP). The EVAP system is responsible for capturing and recirculating fuel vapors from the fuel tank. When there is a leak in the system, it can cause the engine to run lean and produce less power. In some cases, the engine may stall.

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1. Check for leaks in the EVAP system

  1. Verify the evaporator is properly installed and connected to the system.
  2. Verify the A/C system is properly installed and connected to the evaporator.
  3. Verify all hoses and connections are properly secure.
  4. Check for any leaks around the evaporator and A/C system.
  5. Repair or replace any leaks found.

2. Check for blockages in the EVAP system

  1. Check the EVAP system for any leaks or blockages.
  2. If there are any blockages, clear them using a vacuum cleaner or a plunger.
  3. Check the EVAP system for any burnt or clogged parts.
  4. Test the EVAP system by running the engine and checking for any problems.

3. Check for loose or damaged components in the EVAP system

1.Check the EVAP system for any obvious signs of damage. If there is any obvious damage, it will need to be fixed before proceeding. 2.Check the EVAP system for any leaks. If there are any leaks, they will need to be fixed before proceeding. 3.Check the EVAP system for any signs of loose or damaged components. If there are any signs of loose or damaged components, they will need to be fixed before proceeding.

4. Replace the EVAP canister if it is damaged

If the EVAP canister is damaged, the technician will need to replace it. Depending on the severity of the damage, the technician may be able to just replace the canister with a new unit, or they may need to repair the unit first. The technician will need to remove the old canister and install the new one. They will also need to replace the purge valve and check the system for leaks.

5. Replace the EVAP purge valve if it is damaged

  1. Remove the EVAP purge valve cover.
  2. Remove the evap purge valve.
  3. Check the sealant around the valve body and replace if needed.
  4. Clean the area around the valve body and replace the sealant.
  5. Reinstall the evap purge valve cover and torque to 18 ft-lbs.

6. Replace the EVAP vent valve if it is damaged

  1. Remove the instrument panel cover.
  2. Remove the screws that hold the EVAP vent valve in place.
  3. Slide the EVAP vent valve out of the way.
  4. Inspect the EVAP vent valve for damage. If the valve is damaged, replace it.
  5. Replace the EVAP vent valve with a new one.
  6. Replace the instrument panel cover.