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

61,245

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

1 out of 1 people think this is helpful.
60,955

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

7 out of 7 people think this is helpful.
60

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

3 out of 3 people think this is helpful.
60

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

60

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

3 out of 3 people think this is helpful.
60

I would like to talk to you. 716 605 4428

20

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

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

  • Help with my reverse lights! 6 answers

    I have an 06 envoy and the reverse lights are out. Multiple mechanics said they don't know what's wrong. Checked the fuses, neutral safety switch, and blubs. Can't find any problems with the wirin...

    2006 GMC Envoy

    -

    Maintenance & Repair

  • 2007 GMC Envoy thermostat 1 answer

    I have a GMC Envoy and recently had a newer motor put into it. two days after the replacement, the "check engine" light came on. Of course, I called the mechanic who replaced the engine and he said ...

    2007 GMC Envoy SLE-1 4 Dr SUV 4WD

    -

    Maintenance & Repair

  • My 2008 GMC envoy 1 answer

    Well u would like to know why my car us been shaking to much as in driving and when I stop and then it feels like it accelerate on its own plus u can hear like if something is being sand down I ca...

    2008 GMC Envoy

    -

    Maintenance & Repair

  • why would a new battery go dead over night 3 answers

    2002 GMC Envoy 4 Dr SLT 4WD SUV

    -

    Maintenance & Repair

  • Passenger side head light out. 18 answers

    My 1999 GMC Envoy headlight went out and I have taken it to three mechanics and they said they have never seen a headlight bulb like that before. The number on the bulb is 16524491. Auto Zone said the...

    1999 GMC Envoy 4 Dr STD 4WD SUV

    -

    General

Envoy

Looking for a Used Envoy in your area?

CarGurus has 2,393 nationwide Envoy listings starting at $1,800.

ZIP:

Search GMC Envoy Questions

GMC Envoy Experts

#1 ericjames
ericjames
Reputation 380
#2 dandyoun
dandyoun
Reputation 350
#3 T_S_T
T_S_T
Reputation 250
View All

Related Models For Sale

Used Chevrolet TrailBlazer
94 Great Deals out of 5,326 listings starting at $1,700
Used GMC Envoy XL
29 Great Deals out of 840 listings starting at $1,200
Used GMC Yukon
520 Great Deals out of 17,128 listings starting at $1,799
Used Chevrolet Tahoe
776 Great Deals out of 28,447 listings starting at $1,500
Used Ford Explorer
937 Great Deals out of 74,004 listings starting at $750
Used Jeep Grand Cherokee
843 Great Deals out of 68,691 listings starting at $864
Used GMC Sierra 1500
935 Great Deals out of 62,272 listings starting at $1,395
Used Toyota 4Runner
315 Great Deals out of 20,549 listings starting at $2,295
Used Chevrolet Silverado 1500
2,286 Great Deals out of 155,167 listings starting at $1,395
Used Ford Escape
1,119 Great Deals out of 90,859 listings starting at $1,295
Used Honda Pilot
463 Great Deals out of 19,638 listings starting at $599

Used Cars For Sale

2005 GMC Envoy 4 Dr SLE 4WD SUV For Sale
97 listings starting at $1,999