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How do I fix the P0442 code?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The P0442 code means that there is a small leak in the evaporative emission control system. This is often caused by a faulty or damaged gas cap, but can also be caused by a leak in the EVAP system itself. The code will often trigger the check engine light, and the vehicle may run a bit rough.

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1. Check the gas cap to ensure it is tight and free of cracks or leaks

  1. Verify the gas cap is tight and free of cracks or leaks.
  2. If the gas cap is not tight or is leaking, replace the gas cap.

2. Inspect the vacuum lines and hoses for cracks or leaks

If the vacuum lines and hoses for the vacuum operation are inspected for cracks or leaks, it may be necessary to replace them.

3. Replace the Evaporative Emissions (EVAP) canister purge valve

  1. Verify the EVAP system is properly primed and charging
  2. Remove the front bumper cover
  3. Locate and remove the EVAP purge valve (1)
  4. Remove the purge valve assembly (2)
  5. Clean the purge valve assembly and install it on the replacement valve (3)
  6. Install the front bumper cover
  7. Verify the EVAP system is properly primed and charging

Some users might also have success with the following opitons:

  1. Replace the EVAP canister.
  2. Inspect the EVAP canister vent solenoid for proper operation.
  3. Replace the EVAP canister vent solenoid.
  4. Inspect the EVAP system for leaks.