Jump to content

2002 Yukon service 4wd

snowfool

By snowfool
in Ask A GM Technician

Recommended Posts

snowfool Enthusiast

snowfool

Posted
Posted

Started having issues recently. Can drive all day in 2wd......when shifted to 4wd we can sometimes drive a mile, sometimes 5 miles until we get the service 4WD message and the pushbutton lights go out. Restarting the vehicle usually lets us shift back into 2HI. I've swapped the pushbuttons with my silverado thats known to work and also swapped the transfer case shift motors thinking it may have been the encoder. Anything else I can do to save a trip to have it scanned. Its really difficult with younger kids in half day school, one full day, working nights and all things in between for me to get to a dealer while the light is on for it to be scanned. I'm planning on cleaning the grounds under the door when the wife gets home. TCCM related maybe? Thanks for any help.

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Can you think of something that may have happened about the time this started happening? New tires, fixed a flat, new brakes, or something else along that line. Looking for something that happened to any of the parts between transfer case and each tire. Is there just the one driver for Yukon, or is it shared between other family members? Do the other family members always tell you when they have heard something, or that they did something they are not proud of?

 

When you drive the Silverado along the same route that you drove the Yukon, does it behave normally? It would be best to get both trucks out at the same time and follow each other until the Yukon gives error. That way we will know for sure that it is not something stupid in the road conditions or something like that.

00Silverado4x4 Senior Enthusiast

00Silverado4x4

Posted
Posted

How many miles is on the transfer case? It could be the case itself, as in internals worn. I'd see if you can get it scanned for possible codes.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

Started having issues recently. Can drive all day in 2wd......when shifted to 4wd we can sometimes drive a mile, sometimes 5 miles until we get the service 4WD message and the pushbutton lights go out. Restarting the vehicle usually lets us shift back into 2HI. I've swapped the pushbuttons with my silverado thats known to work and also swapped the transfer case shift motors thinking it may have been the encoder. Anything else I can do to save a trip to have it scanned. Its really difficult with younger kids in half day school, one full day, working nights and all things in between for me to get to a dealer while the light is on for it to be scanned. I'm planning on cleaning the grounds under the door when the wife gets home. TCCM related maybe? Thanks for any help.

You can't keep tossing parts at it , that's called guessing ,

 

You need it scanned , plain and simple

snowfool Enthusiast

snowfool

Posted
  • Author
Posted

As far as life changing events in the driveline....I did remove and reinstall the transmission twice in last 30k miles. Theres 156,XXX on the vehicle. First, Sunshell broke so I installed a rebuilt unit from finish line transmissions. Second time, yank convertor was slamming when it locked up and took out the pump. Couldn't believe all the friction material in the pan from that. Trans work was done in the September/August time frame so we wouldn't have noticed 4WD issues until the winter. Not sure if they'd be related. I found out a friend that I'm going riding (snowmobile) with this weekend has a solus pro scanner so we'll scan it before leaving for the weekend. Nothing worse then wasting time and money.....and swapping the shift motors didn't take all that long. Just wondering if anyones ride had the same symptoms and maybe understand how and why the system operates how it does.

 

Thinking back on my truck....I've repaired cold solders on the switch and also replaced the clutch discs in the case when they were toast. I would think that if I screwed up the speed sensors some how that I would have a fault in 2HI but maybe not. Whe does it look at those and for what?

snowfool Enthusiast

snowfool

Posted
  • Author
Posted

Just wanted to give an update....scanned the Yukon tonight and two codes were there. Something about the front transfer case speed sensor and shift not completed. So, I'll start there when I get home Sunday. Man I'll be pi$$ed and glad at the same time if its something as simple as missing that connector when I did the tranny work.

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Just wanted to give an update....scanned the Yukon tonight and two codes were there. Something about the front transfer case speed sensor and shift not completed. So, I'll start there when I get home Sunday. Man I'll be pi$$ed and glad at the same time if its something as simple as missing that connector when I did the tranny work.

 

Actually you should take a lot of pride in finding the fault without turning to a parts toss. If this is in fact your issue, you should learn to always check old school first. This applies to any issue that comes up. For engine sensors, you just need to remember what the various sensors replaced when engine was moved to EFI. Not saying it is always going to find the issue, but I am saying checking old school is just about always free. Checking for something within the EFI system usually ends up with someone replacing parts that were not failing.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Atlas
      Tire psi

      By Atlas · Posted

      It's possible the two trucks are using different body control modules which is why yours works and the OP's doesn't.   So much in these newer vehicles depends on model/trim configurations, production date. They don't all use the same modules like back in the day.
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      I forgot to answer the question as per what market mine is set to and yes I finally found that area on mine and yes its also set to America.   So here's something I realized as I wasn't looking at that part in the Sierra section until now, your right that what I see here as choice 3 under Sierra which says 07/2023-06/2026 ( 433 MHz 13542523 ) it has no choice 5 for tire pressure selection. Where as it does under the Chev choice. However I kept going down the list within the Sierra and I am really wondering if choice 9 will work for your truck as it has the same model number and hertz sensor as my truck. I would say try that choice first, if that doesn't work then jump over to the Chev section and again choose that same model and hertz choice as for some reason the Chev section gives the choice 5 of tire type/pressure selection for going back a number of years. Could very well be an Autel thing that they just didn't get the updates all done properly under Sierra but anyway first try that selection 9 I suggested under Sierra and then go from there. 
    • B07
      Anyone have a spare?

      By B07 · Posted

      Looking for this piece that holds the hose clamp in place. I have the hose clamp just not that other piece. Dealers and wrecking yards in my area will not sell just that piece. They want you to buy the whole air tube $100 +/- to get that $5 part.  that piece isn't molded to the air tube as I looked at my friends truck. It's held on by a screw and nut. I'm trying to put the OEM parts on the truck as the previous owner butchered things up installing an aftermarket CAI. It really looked homemade. 🤣 Thanks
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      Ok I missed that part that yours is a GM. The strange part is that the choice for year ranges and within the year of 2026 is different on the Sierra then on the Chev for some reason as I am looking at my tool at the Sierra choices. Now I am guessing you see as to your sensor part number as it may be different on your truck for some reason and a call to GM should get you the part model number of the sensors you should have as well as which MHz your sensors are. I know mine are the ones as per what I listed but there are other choices in the Autel and got me wondering if by some chance they put different ones in your truck. Having said that, did you try using each of the choices starting from No 1 and going on down the list, not sure if that would mean shutting off the engine each time and resetting the tool and going at it again each time. Also I thought of something else which may sound retarded but if there was some stupid chance that the chev choice would work. The reason I say that is that the Sierra is showing a range up to 06/2026 for the various choices of sensors it could be where as the Chev has one choice that has that 12/2026. By the way it is possible to not run the truck and you may know that as per not pressing the brake but pressing and holding the start button for a few seconds and it lights up the dash ( its called service mode ) but that sucks battery power and if it were me doing it that way I would be throwing on a decent sized battery charger before doing it that way as killing your battery won't make you happy at me at all !.    Like I say, just a thought to try the Chev choices if you have already exhausted the Sierra choices but first it would be nice to know for sure what exact sensor model and hertz your truck uses as I assume only those choices that mention the sensor would work unless a choice that does not mention the sensor model would somehow work. Its frustrating when one is trying to use tools like this without the experience of the tool and the vehicle, as I am sure dealer techs themselves struggle with it when starting out or a new model year comes along that is slightly different. 
    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      I tried before I updated the scan tool just incase an update messed it up, but it never worked so I updated the scan tool and it still didn't work.   Only difference is I click on Sierra not Chevrolet cause I have a Sierra.   If I click on 2026-2024 I didn't have any option to change placard, when I click on 2023 it does give me the option but when I try to do it,.it says vehicle not supported!   I have my region or market or whatever it is set to America I think, is that what yours is set to?

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...