my check engine light came on I had it checked and the code was p0440 is this something I can fix myself or do I need a mechanic?

Asked by Sep 25, 2014 at 05:12 PM about the 2002 GMC Envoy 4 Dr SLE 4WD SUV

Question type: Maintenance & Repair

7 Answers

75,385

This is a emission control malfucntion,could be clogged vacume canister,or just a sensor,best left to pro to fix,this.

2 people found this helpful.
79,195

This trouble code is telling us that the computer has detected a large leak in the EVAP system. The EVAP system recirculates gasoline fumes back to the engine to be burned up instead of being released into the air. First thing to do is check your gas cap. Make sure it's on tight. A loose gas cap will cause this trouble code. If your Envoy is running ok and the gas cap was on tight replace the gas cap. A leaking gas cap will cause this trouble code when the vehicle is running fine. Once you've done that, drive normally for about a week but keep the gas tank between 3/4 and 1/4 full. No more and no less. This will allow the computer to run the necessary tests on the system and determine if it's ok and turn off the check engine light. If the vehicle is not running right look for a disconnected or damaged vacuum hose under the hood. This will cause this trouble code and a poorly running engine. HTH. -Jim

10 people found this helpful.
150

I had a test done and 4 codes came up what should I done

10 people found this helpful.
150

I replaced the gas cap now it might be the upper lower oxgen senor. Could that be the problem.

1 people found this helpful.
150

I had a test done and 4 codes came up what should I done Could you call me I would like to talk 716 605 4428

4 people found this helpful.
150

I would like to talk to you. 716 605 4428

50

When i did the obd ll test came up po440 I replaced the valve under the hood n ran fine after There is a video on utube showing how to replace the sensor valve Its located on the right side of your engine Has two ends of which hoses are attached n is black This is for the 2002 envoys

5 people found this helpful.

Your Answer:

Envoy

Looking for a Used Envoy in your area?

CarGurus has 1,560 nationwide Envoy listings starting at $1,000.

ZIP:

GMC Envoy Experts

  • #1
    dandyoun
    Reputation
    480
  • #2
    ericjames
    Reputation
    410
  • #2
    Js08016
    Reputation
    410
View All

Related Models For Sale

Used Chevrolet TrailBlazer
59 Great Deals out of 3,349 listings starting at $1,500
Used GMC Yukon
328 Great Deals out of 21,474 listings starting at $2,450
Used GMC Envoy XL
5 Great Deals out of 477 listings starting at $2,300
Used Chevrolet Tahoe
547 Great Deals out of 38,191 listings starting at $1,243
Used Ford Explorer
862 Great Deals out of 67,771 listings starting at $800
Used Jeep Grand Cherokee
978 Great Deals out of 76,795 listings starting at $900
Used GMC Sierra 1500
746 Great Deals out of 61,254 listings starting at $1,395
Used Ford Escape
1,022 Great Deals out of 112,116 listings starting at $1,000
Used GMC Yukon XL
226 Great Deals out of 12,719 listings starting at $2,400
Used Honda Pilot
369 Great Deals out of 44,910 listings starting at $1,900
Used Ford F-150
2,356 Great Deals out of 208,288 listings starting at $998

Used Cars For Sale

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.