code P0442

Asked by Feb 26, 2017 at 08:34 PM about the 2015 GMC Acadia Denali AWD

Question type: Maintenance & Repair

what does this mean when engine light is on?

7 Answers

21,525

P0442 Evap Emission Control Small Leak Detected

1 of 1 people found this helpful.
21,525

Gas cap not on tight or bad, Purge valve bad or unhooked, lines bad or off. canister bad ect.

21,525

A small leak/hole in a fuel vapor hose/tube. Other small leak in EVAP system. Faulty vent o-ring seal. Defective vent valve Defective purge valve Defective leak detection pump. Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back. Otherwise, replace the gas cap (we recommend an OEM not aftermarket part), or Inspect the EVAP system for cuts/holes in tubes/hoses. More advanced troubleshooting steps include: Using an advanced scan tool, perform an EVAP leak test Verify operation of the EVAP purge solenoid / valve Perform a smoke test to see where the leak is.

21,525

Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

21,525

The vehicle's PCM (powertrain control module) tests the evaporative emissions (EVAP) system for large and small leaks among other conditions. In the case of this DTC, it indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system.

77,845

small as .020" in dia.

73,935

You'll need a smoke test done to find out where the leak is. The leak can be so small it can't be seen with the naked eye. HTH. -Jim

Your Answer

Acadia

Looking for a Used Acadia in your area?

CarGurus has 46,146 nationwide Acadia listings starting at $2,990.

ZIP:

GMC Acadia Experts

  • #1
    Rocco Racco
    Reputation
    170
  • #2
    Tom Demyan
    Reputation
    150
  • #3
    Kelly Mayo
    Reputation
    130
View All

Related Models For Sale

Used Chevrolet Traverse
808 Great Deals out of 33,912 listings starting at $3,700
Used Ford Explorer
1,175 Great Deals out of 64,182 listings starting at $1,499
Used Chevrolet Tahoe
888 Great Deals out of 39,791 listings starting at $1,990
Used GMC Terrain
550 Great Deals out of 33,121 listings starting at $4,799
Used GMC Yukon
578 Great Deals out of 18,667 listings starting at $2,000
Used Buick Enclave
483 Great Deals out of 23,549 listings starting at $3,995
Used Dodge Durango
380 Great Deals out of 23,761 listings starting at $1,495
Used Toyota Highlander
569 Great Deals out of 37,087 listings starting at $2,500
Used Jeep Grand Cherokee
1,066 Great Deals out of 67,520 listings starting at $950
Used Honda Pilot
698 Great Deals out of 36,941 listings starting at $888
Used Chevrolet Equinox
1,167 Great Deals out of 72,363 listings starting at $2,000
Used Toyota 4Runner
319 Great Deals out of 27,207 listings starting at $1,900
Used Nissan Pathfinder
489 Great Deals out of 23,881 listings starting at $895
Used GMC Sierra 1500
1,246 Great Deals out of 62,909 listings starting at $1,200
Used Kia Sorento
444 Great Deals out of 32,794 listings starting at $1,400

Used Cars For Sale

2018 GMC Acadia Denali AWD For Sale
4,739 listings starting at $41,098
2017 GMC Acadia Denali AWD For Sale
18 Great Deals out of 433 listings starting at $34,941
2016 GMC Acadia Denali AWD For Sale
13 Great Deals out of 170 listings starting at $28,290
2015 GMC Acadia Denali AWD For Sale
38 Great Deals out of 576 listings starting at $21,695
2014 GMC Acadia Denali AWD For Sale
38 Great Deals out of 536 listings starting at $18,200

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.