Question about 2002 GMC Envoy

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2002 envoy transfer light bkinks. i keep it in 2wd but seen a red N while it was blinking, i read the manual and it says it will blink when switching gears. i dont switch gears.

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  • GMC Master
  • 1,311 Answers

The 2002 model year had problems with the TCCM (Transfer Case Control Module) going bad. Find one at a salvage yard, get one from a 2003+ vehicle.

Posted on Jan 19, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: service 4wd light

what causes the 4wd to kick in when you have it in 2wd

Posted on Apr 05, 2009

  • 407 Answers

SOURCE: Parking brake light keeps blinking, 4 blink code?

make sure emergency brake pedal is pulled all the way up

Posted on May 06, 2009

GARYca
  • 672 Answers

SOURCE: 2002 envoy 4wd problem. clicking sound comes and

Clicking sound- Possible electronic fan clutch failing. This is a typical problem with the 4.2L I6. When you hear the clicking, open the hood and listen if its coming from the fan clutch on front of the engine. this could also cause abnormal engine and transmission cooling. As for the "N" light and 4wd issue, have scanned at the dealer....Hopefully this helps

Posted on Jul 18, 2009

johnjohn2
  • 5763 Answers

SOURCE: My 2002 Envoy will not shift into 4 wheel drive or

check the transfer case selector motor, they go bad and thats what happens, no 4wd and no other lights on switch because its not doing any changing of the tranfer case, to test remove motor ground it and with connector connected, try to switch to 4wd see if motor moves, you can use a test light to make sure its getting power, hope this helps.

Posted on Dec 13, 2009

  • 1374 Answers

SOURCE: 2002 GMC envoy SLT 4x4, tccm, switch problem

About 45% of all transmission problems are due to a defective battery, its components and the charging system. Make sure you have the correct battery in the vehicle and inspect all items relating to the charging system and the battery. The vehicle should charge between 13,5 to 14.5 volts. The condition of the belts is part of this inspection. If all of this is A-ok then get a scanner and pull the codes in the PCM.
Remember once light is illuminated for a item that item no longer works. Once you've gotton to this point let me know and I'll walk you threw it. Hopefully its just a weak or incorrect battery or something along those lines. Good luck and keep me posted

Posted on Mar 09, 2010

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2008 Dodge Ram 4WD LOW light blinks while running in 2WD. When applied the 4WD High works fine as well as the 4WD LOW but the light keeps blinking and you can hear the system trying to apply 4WD LOW


Replace the motor/module on the transfercase. It has an internal short. Don't replace it. Soon you will have to replace or rebuild the transfer case and the motor.

Oct 31, 2014 | 2004 Dodge Ram 1500

1 Answer

When i started my car the 2hi light was blinking the red N was light up. I tried changing it into 4awd and 4 low and 4 hi and it just continues to blink. what does this mean??


In this model year, the TCCM (Transfer Case Control Module) gets stupid and does not wake up. Get one from a later model year from a salvage yard. The other possibility is a bad 4WD selector switch, try running the switch thru all the positions numerous times with the truck off.
You may have to have a technician with a high end scan tool diagnose the problem.

Aug 13, 2011 | 2002 GMC Envoy

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Recently got remote starter installed (not by dealer). Shortly after, light on 2WD kept switching to A4WD. When dial switched to try to get vehicle back in 2WD, light would stay for a few minutes but then...


GM has had more that their fair share of transfer case problems. I have also seen may problems caused by addition of aftermarket equipment - especially remote starters. There is a good chance that you have a damaged transfer case, but if an electrical problem was the root cause of the damage, you will only destroy a new transfer case if the electrical problem is not resolved. If the mechanic that you are going to does not have the proper equipment and/or information to diagnose your transfer case control circuits, you should consider getting a second opinion from the dealer before buying a new transfer case. I currently work in an aftermarket shop. There are several of the GM 4 wheel drive systems where the manufacturer has not released the information necessary for an aftermarket shop to properly diagnose and repair the system. Some mechanics are simply to proud to say "I can't" or "I don't know".

Jan 22, 2011 | 2002 GMC Envoy

1 Answer

My 4wd switch worked fine. Right now it is stuck on 4lo ans when I try to switch it to 2hi it just blinks and stays on 4lo with a solid ligbht


I'm not a mechanic, but I recommend getting this in for fixing ASAP... Mine started doing the same thing, except going from 2wd to A4wd... now it is all over the place, I've spent $2000, and I'm still at square one... You don't want to wind up wrecking your transfer case (or the motor on it), as that gets costly!! :) Good luck

Jan 14, 2011 | 2002 GMC Envoy

1 Answer

My 2002 Envoy will not shift into 4 wheel drive or anything other than 2WD. The lights are not lighting up on the switch and the fuses have been checked and good. Any ideas?


check the transfer case selector motor, they go bad and thats what happens, no 4wd and no other lights on switch because its not doing any changing of the tranfer case, to test remove motor ground it and with connector connected, try to switch to 4wd see if motor moves, you can use a test light to make sure its getting power, hope this helps.

Dec 13, 2009 | 2002 GMC Envoy

1 Answer

Wont shift from 2WD to 4WD. 4WD indicator switch blinks (light) but 2WD switch light never goes out.


check switch , fuse and relay if good check cable hoses and wiring at transfer are not damaged or disconnected -check actuator for proper movement actuator has a tendency to stick lube actuator rod if necessary

Oct 30, 2009 | 2005 GMC Sierra 2500HD 4WD

1 Answer

Chevrolet truck 4wd switch blinks


If they are blinking I believe it means that there are fault codes present in the pcm. You need to get the computer scaned to see if there are an codes present. If you live near an Autozone or Checker autoparts they can scan it for free.

Jun 21, 2009 | 1996 Chevrolet K1500

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