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I have the codes to the problems on my 04 GMC envoy. How do I figure out how to fix them?

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  • Jeremy W.
    Jeremy W. Apr 30, 2013

    what are the codes?

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  • Cars & Trucks Master
  • 21,873 Answers

Depends on what the codes are.
You can list them here, or go to engine-codes.com for a list of definitions.

Posted on May 01, 2013

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6ya6ya
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SOURCE: Speedometer stopped working

You need quit on american cars .VERY POOR QUALITY.

Posted on Jul 08, 2009

c17hydro
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SOURCE: GMC Envoy w/ code P0128

Start at $89 right off the bat just for diagnostics and then depending on what they find that is causing that fault, at LEAST one hour labor, plus parts....I would say $250 is a good ballpark figure....looking up your fault code now.

Posted on Aug 28, 2009

  • 1311 Answers

SOURCE: 2004 GMC Envoy with a P0526 sensor problem

This code indicates a problem with the fan clutch, the speed it is running is not the speed it was commanded to run/ The fan clutch assembly needs replacing.

Posted on Sep 09, 2010

  • 1311 Answers

SOURCE: 2004 gmc envoy code 0128

This an engine coolant temperature fault, most likely caused by a defective thermostat, probably one that is open all the time.

Posted on Sep 09, 2010

ryanlutton
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SOURCE: license plate light out on

Has 2 screws for the cover, take them out and replace the bulb/s. Might check the seal that seals the entire license plate panel, it's black. Common problem is that this seal comes folded under from the factory and allows water into the bulb area.

Posted on Nov 30, 2010

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1 Answer

I need a filler neck for a 2001olds bravada. what other vehicles can it come off from


I'd stick with Blazer/Jimmy/Envoy Chevrolet S-10 & GMC Sonoma pick-ups (94-04). Inc. S-10 Blazer & GMC Jimmy (95-04), GMC Envoy (98-01) & Oldsmobile Bravada/Isuzu Hombre (96-01)

Aug 15, 2017 | Cars & Trucks

1 Answer

2002 envoy code co550


you need to replace the tccm and get it programmed.


2-04-21-006E: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set No Communication with TCCM (Reprogram Transfer Case Control Module) - (Jul 20, 2006)
999999995.gif Subject: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set, No Communication with TCCM (Reprogram Transfer Case Control Module) Models: 2004 Buick Rainier 2002-2004 Chevrolet TrailBlazer, TrailBlazer EXT 2003-2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2002-2004 GMC Envoy, Envoy XL 2003-2004 GMC Sierra, Yukon, Yukon XL 2004 GMC Envoy XUV 2002-2004 Oldsmobile Bravada with Electronic Shift or Active Transfer Case (RPOs NP1, NP4 or NP8)

This bulletin is being revised to add Subject information and change the labor operation. This bulletin cancels and supersedes Bulletin Number 03-04-21-006. Please discard Corporate Bulletin Numbers 02-04-21-006D and 03-04-21-006 (Section 04 -- Driveline/Axle).
ConditionSome customers may comment that the 4WD/AWD indicator lights on the selector switch do not work, or the 4WD/AWD system may be inoperative and/or the service 4WD light is illuminated. The condition is typically intermittent and always occurs at key-up. Upon investigation, the technician may find DTC C0550 set.
CauseThe Transfer Case Control Module (TCCM) has not received the wake-up call during key-up and has remained in the "sleep mode".
When the TCCM is in the "sleep mode", it will not communicate with the class II bus or the Tech 2®.
Correction
  1. Try to communicate with the TCCM. If no communication, go to step 2. If communication is possible, go to step 5.
  2. Remove the underhood (ATCM or TREC) TCCM fuse.
  3. Wait 30 seconds.
  4. Reinstall the fuse. The module should "wake up" and communicate with the Tech 2®.
  5. Check for codes in the TCCM. If a C0550 is found current or in history with or without other codes, replace the module and go to step 6.
  6. Reprogram the TCCM with the latest TIS software using normal SPS procedures.
  7. Verify operation and that no codes are present.
Important: For the 2002 model year, the TCCM must be replaced and reprogrammed.
Warranty Information

Jul 29, 2011 | 2002 GMC Envoy

2 Answers

My engine service light keeps on coming on after the mechanic "sopposibly" fixed the problem. They change the Thermastat, water pump, and cleaned out the fuel pump. I can not put gas good it...


Bypass your mechanic and go to a place like Autozone that will check the codes that your service light is throwing for free. Let me know what code this is, and I can help from there.

As far as the other problem, there was a re-call on the filler neck with this year. Not sure if it's still active, but I had the same problem on my 03' Trailblazer, BUT that was back in 04' when they replaced the filler neck and it was all covered.

Mar 21, 2011 | 2003 GMC Envoy

1 Answer

04 GMC Envoy 4.2 Get PO0171 code and since the envoy doesn't have a MAF sensor what is the most common problem.


First thing to do is to run some Techron injector cleaner through the gas tank, then a cleaning of the throttle body is also very important. For more information, check out www.trailvoy.com, this forum is a wealth of information on Trailblazers and Envoys.

Sep 14, 2010 | 2004 GMC Envoy

1 Answer

Oil leak


is the a rear main seal leak? if yes then the trans must be removed, if no then the trans doesn't need to be removed.

Mar 23, 2010 | 2004 GMC Envoy

1 Answer

04 Envoy service engine soon light is on. How do I get a code to identify the problem? The oil has been changed. The trans has been flushed and new filter. the gas cap is tight. The tires are rotated. My...


need to have system checked with a scanner to get trouble code Auto Zone or Advanced Auto parts will do that for free if you have one around you

Feb 12, 2010 | 2004 GMC Envoy

2 Answers

2004 GMC Envoy XL Loss of power


I also have an '04 Envoy XL. The problem we had was very similar. The truck lost power and the wife and kids were stuck on the interstate. It was the catalytic converter totally clogged. We were told by our trusted mechanic that we were lucky not to have blown a head gasket from the back pressure. Two days after having the converter replaced the check engine light came on. I went to Autozone to have the codes read. I don't remember the code number but it was basically that the thermostat was stuck open and the engine was running too cool causing it to run rich and clog the converter. I did not get a light until after and the light went out on it's own. I hope this helps you. GOOD LUCK!

Jul 07, 2008 | 2004 GMC Envoy

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