It's good to hear fixes like this as it gives others another avenue if they tried everything in this video. I'll pin it.

I honestly have the same issue with my truck it's a GMC Yukon XL four-wheel drive

04 tahoe same deal. Park doesnt even work. Have to choc the tires to keep from rolling

Dielectric grease is not electrically conductive. You can't just fill connections with it. That's not how you use it.

2u

100% agree

I feel this, imma drive this piece of fucking shit off a cliff and go buy a 99. I can't get mine to engage in 4wd and we got 12 inches of snow falling here in south dakota and we live 20 fucking miles down a dirt road.

@@halfassranch8363 sorry brother that sucks...sounds like you need a snow machine! My 98 Tahoe push button 4x4 still works (knocking on wood....now) but I won't ever give up my 99 7.3 super duty...leaf springs and solid axles front and rear, manual hubs, manual transfer case, 6 sp manual transmission. Last of the real trucks..only thing it's missing is manual windows lol.

@@AZsmoothrider its all good, yeah next truck i buy is going to have locking hubs and the transfer case shifter on the floor. I've never had one of my square bodies not engage. I ordered the switch for inside the dash and we'll see if that hail Mary does the trick. I'm hoping the switch intermittent fails.

@@halfassranch8363 there's a couple guys on here with videos converting their C/K trucks to manuals by removing actuator motor and installing an aftermarket choke cable kit to engage...I plan on doing this once mine fails.

glad it helped

glad it helped

Glad it helped

Hope it helped

Glad it helped 👍

Same problem here also

My issue ended up being the 4wd actuator and the 4wd fuse on the drivers side fuse box. There is a small black disk inside the actuator that I swapped out and haven’t had a problem since.

​@@tylerstonto1626 Were you having the same symptoms this guy was talking about?

Glad it helped

do I remove the fuse with the truck on or off?? before I remove battery cable or after?

Thanks for watching

100% and if you really look at it I did both in this video so hopefully others had a way to start. Big thing is to start off free and work your way through it.

@@Alpha-Works-Tx yes, , this forum of helping each other is what i would label as smart and kind, what a society is supposed to be about, the etymology of society in french is like helpful and supportive, not competitive. Sometimes intuition can guide us as if it were magic, TOO!

Still good? I’m having the same issue I switched the switch out today no changes. I’m going to clean the grounds on the frame below the drivers seat

PlayaMadeMeskin1 still good so far

Did you need to go to the dealer, or will non-GM scanners work?

Thanks for the feedback for others to check and glad it helped.

Did you use a harness for your radio install? I had a cheaper one that gave me similar issues. I swapped to a Critchfield one and issues were gone. I honestly think these Chevy's around these years do have wiring issues in a lot cases. My issue has not come back but the chase down to find the original problem was not fun at all.

Yea going into 4L by itself is typically the TCCM acting up

Put it in neutral

@@bthayer7797 At the end of the day it ended up being the transfer case. It works fine after replacing it.

@@jtoddhayes1i have the same problem. I have a suburban 2011 and sometimes it turns to 4L by itself without me touching it. Can you help me what is the problem and/or how can i fix it? Thanks in advance

@@theleader5001 I think my issue wasn't fixed until I replaced the transfer case.

So funny, same here with all the minor issues. But I'm about 99% sure that it's my TCCM. And I love my old 06 Silverado. Wife keeps telling me to trade it in for something new... No thanks.

Yes try all the free stuff first.

Start with the fuses and then check the relays on the passenger side. If you have auto level you can swap the fuses. If that doesn’t help check for leaks on the differential and make sure the drive shafts are firmly seated as they can wear out and get pushed out almost a half inch causing similar issues. Hope this helps.

It's frustrating for sure but try the free stuff and work your way onto the other stuff.

Did that work?

You could always grab a junkyard TCCM for 5 bucks as well if you have a parts yard near you

@@Alpha-Works-Tx thats a great idea i will check that one for sure never thought of that

Glad it helped

Junk yards have the best prices but also check out eBay

Try using graphics wrap type material. It comes in so many patterns

This problem sucks because it seems that everyone has the problem but all fixes are one of the many I have went over or others have added. It’s a frustrating issue for sure.

If you drive it you will know if it’s in 4wd vs 2wd. Pulling the fuse usually does the trick. I would check the grounds and disconnect the battery to reset everything.

Just seen your other comment thanks for video

Nope other 2 can go either way

2004

Plug and play

What brand encoder did you get? I’ve seen a lot of guys get some parts that only last a month or two can cause new issues. Honestly if I had a junk yard close to me I woulda pulled a TCCM out of that for only 10 bucks but electronics on these gm’s are finicky to say the least.

It did sometimes, but not every time. The problem with the service 4wd issues is alot of the time it's intermittent which makes it hard to diagnose.

@@Alpha-Works-Tx I have one more question....you were explaining how to reinstall the TCCM, but the video skipped. My TCCCM has Three Ports (Black, Gray, Black). Which Plug/Port do I insert first? Btw, I've visited many GM forms on this issue, but none seem to explain it. Thanks in advance.

@@kmesse1784 4 pin connector is last the other 2 plugs it's doesn't matter if they are 1st or 2nd.

@@Alpha-Works-Tx Got it! Thanks TR.

These 4wd systems are finicky and the older they get the more issues electronics and wiring will have. You probably just reset since you pulled the fuse for the middle of the system.

Try resetting the battery and cleaning the grounds as well as ensuring the harness to the transfer case is clean, not wet, and not corroded. It sounds like your close to solving your issue.

@@Alpha-Works-Tx when you say reset the battery, you're saying to disconnect it for a few hours to give the system time to clear? My mechanic said he tested and checked the wiring for continuity and ground and he says it all looks good. He wants to call a guy with a GM Scanner to reprogram the TCCM but Dorman says their units are pre programed. I'm curious about the ground you jumpered. I want to try that but we have a hurricane happening here on Long Island today so it has to wait.

@@Alpha-Works-Tx also, I cleaned the grounds under the driver side first. They needed a good cleaning but one of the 2 grounds has a stripped hole so I coupled them on one bolt. Could that cause a problem?

@@AmatuerOasis yea just disconnect both sides pos and neg and let it sit for a couple hours. As long as the ground is grounded it shouldn’t be a issue. Stay safe up there.

I have replaced everything, and even did an extra ground wire as instructed from video ...still NOTHING except its stuck in Neutral and wont shift with neutral light on!! VERY FRUSTRATED !!! hope THIS TRICK WORKS , and 2 modules, been thru 3 Moters, 3 switches ...Hope it works .... would appreciate any advice...

4 pin goes last

@@justingonzalez702 so you can plug the other big connectors into the module in any order as long as the 4 pin is last?

Hello, if the grounds have been cleaned and you have tried a battery reset, the next step would be transfer case control module. A lot of the people I have spoke with through the comments and also my personal issues with my truck have been resolved by changing the TCCM out.

How’s your transfer case harness look? clean? That and check the grounds for sure, sounds like you have covered everything else

thank going in to the shop every thing replaced ............... well ne w they say. @@Alpha-Works-Tx

That sounds more like a transmission problem, but check your transfer case and make sure it is not cracked and leaking. I had to get a transfer case saver cover when mine cracked and it was around the time I was having transmission issues as well.

That could be a bad relay or what it was in my case it was the ecm. Don't waste money trying to find a used one for the same year range just pay the 150 bucks and order one set to your vehicles vin number. Also if you have a factory radio it will lock it when it's changed out. I've been told dealers have to be the ones to unlock it but I think it's cheaper to buy a aftermarket one. Hope this helps.

Check your ecm in the box next to your battery. I had the same problem with the fan running and the ecm had corrosion on it. Replace it and problem solved.

Lights not coming on sometimes was one of the symptoms my truck had before the issues got worse. TCCM was my fix but my issues also got a lot worse before doing it. The TCCM was around 220 dollars if I remember right.

@@Alpha-Works-Tx thanks for the great info!

Is tccm main computer or another smaller one

@@wildbill5764 it was the switch. Defective ac delco. Bought a smp and works mint

My ram 1500, 08 has started trying to go in by itself. Today walked up to it and unlocked truck with key button and transfer case switch started running, key on my hand. When it stopped I could push unlock button on key and it try again. What the hell happening??

Try disconnecting the battery for a couple hours. While that’s disconnected check all fuses and clean the ground under the drivers side. Check your transfer case fluid as well and when your shifting the transfer case you are in neutral right?

My new to me '04, Z71, Burb switched on it's own, no engine crank sometimes, door locks acting up and check engine light was always on too. The single black/white stripe ground wire at the rear of pass. head had a weak connection. Added enough wire to attach it to the firewall ground stud on drivers side that has braided strap to engine rear. Fixed all the problems. Also clean grounds on frame below drivers seat and ground on frame below core support, drivers side. Bad grounds cause lots of problems.

@@jefffrayer8238i have 2011 suburban and sometimes 4 wheel drive turns on suddenly by itself without me touching it, i had to put it back to 2 wheel drive and it worked going back. But why the 4 wheel drive turns on ? It happens to me several times, can you help me what is the problem and how i fix it Thanks

@@theleader5001 Componets do go bad but at least with my generation truck I would clean the grounds first. Many have fixed their problems including Limp Mode by simply cleaning the grounds. A weak ground can cause a ton of hard and intermittent problems. Sometimes it's hidden as under the drivers seat there is 2 wires in 1 eyelet but if you don't push plastic conduit back you wouldn't see the second wire broke off. I didn't need it but my mechanic can look it up and tell me where all the grounds are located and I'd slip him a $20. That ground wire fixed all my problems but now I need to do an overhaul. Hope this helps.

The sound and rubbing feel as well as something feels like it’s going to snap sounds like when my wheel bearing was going out. You would know if it’s in 4 whee drive as you would feel it when trying to drive fast. Have you tried any of the free steps such as battery reset and cleaning the grounds? Only thing I can recommend is to lift the front up and place it on jack stands so you can try and determine what the issue is or have someone look at it.

Your issue makes me wonder if there is corrosion in the harness for either the transfer case or transmission. Are you in a place that rains a lot or has snow? A lot of people have seen the looms and connector clips holding water.

@@Alpha-Works-Tx Yes to both of those. Funny you say that it seems to go away if I go through a car wash or in the rain the problem seems to go away for awhile.

@@cv8metal884 that’s odd lol I would still check them as it’s usually a free fix for most.

@@Alpha-Works-Tx just check the harness and plugs going to the tc and Trans?

@@cv8metal884 yes some have found water in the looms and plugs causing the 4wd system and other electronics to work on and off.

I have the same problem, my 4 wheel drive sometimes engaging by itself? Did you get it fix? Can you help what is the problem and how you fix it? Thanks

Yes

Take out the TCCM and check the connectors if possible swap it out with a junk yard one.

@@Alpha-Works-Tx appreciate it, been having this issue in my wife's tahoe for almost a year, don't want to damage anything with it only being drivable in auto 4x4, but thankful it will at least do the auto over 4hi.

@@andrewsavage1872 did u find out what was wrong with it? I have a similar problem

Lots of people have similar issues with no codes and it leads to TCCM or wiring at the transfer case. For the wiring just unplug and look at it make sure it’s not wet or corroded.

@@Alpha-Works-Tx what if it is wet? Is there anyway to fix

@@elireynolds7131 air hose and let it dry out.

@@Alpha-Works-Tx now it's saying I'm in 4 hi and 2 hi but it's in 4 hi and won't switch to anything else

Sounds like the TCCM

It’s a JVC KW-V218T

Thank you!

It would for me before but another time it didn’t. Try removing it and you will be able to tell when driving if it’s in 2wd only.

If its in 4 weel drive YES !

Plug and play

@@Alpha-Works-Tx i had the original flashed nothing changed. If you would read my backstory to help me diagnose I'd really appreciate it. The truck is an 07 Sierra. It's said service 4WD for about 10 years. Only in the last few years has it complete shit the bed. You used to have to switch back and forth on the dial. Go into reverse and drive and it would switch. One day it got stuck in 4WD and I needed it thrown on a lift to pound through the gears and switch the dial between Drive and reverse. Sometimes the light on the dial would be on others it wouldn't. It's usually always on now but only for 2WD and no light changes if you switch it. I've had the original TCCM swapped myself from a scrap truck. Nothing changed. I've swapped the Encoder Motor. Nothing changed. Currently before I have my appointment for repair I'm trying your method leaving the battery unplugged for a prolonged period and I'll try both TCCM'S. I'm not sure if it's a single variable trial since the 2nd TCCM isn't flashed so it doesn't prove that isn't the issue unless someone can tell me that it doesn't need to be flashed to work in another vehicle. Unless you're method works a small town garage told me the TCCM is almost never the issue it's an encoder motor and usually if that isn't it then there's an electrical issue Currently my vehicle is rusted out and I'm welding on the frame just to keep it inspected until I can afford another. I can't pay $1000 to try parts.

@mail-qh2qc they are correct on the encoder as usually after time it rust and locks up. Wiring could be the issue since you live up north most likely. Wouldn't hurt to clean the grounds and clean up all wiring points as they may be dirty, rusty, or just damaged. A lot of stuff is free to try like disconnecting the battery, pulling the trec fuse, and cleaning up harnesses and wiring. That what I would do and also make sure you plug the TCCM in the correct order when installing as this does make a difference. Hope this helps.

@@Alpha-Works-Tx I let it sit overnight with the battery unplugged and tried the other TCCM. At first the light flashed on auto and nothing happened. I turned off the vehicle and tried again 20 minutes later. Now it works. Not bad for a $25 TCCM. Thanks for the help.

@@mail-qh2qc glad you got it back up

Nope everything has been good since

Check the transfer case for cracks or leaks. Also make sure the fluid is at the correct fill.

The mechanic was saying it’s the motor in the transfer case and the actuator in the front axle I just rebuilt the transmission a month ago

Did you check the harness to the transfer case by chance? A lot of people have had issues with water in the loom and plug.

Nope they work straight out of the box

@@Alpha-Works-Tx Thanks

Sounds like a bad connection or possibly some corrosion. Have you checked the grounds?

@@Alpha-Works-Tx i had a shop look at it and they couldn’t fix it . i just so happen the be putting the 15 amp fuse back in and as soon as the fuse made contact with the two pins on fuse panel it clicked and all the lights on the switch flicker for a second

@@classicxl mine was real finicky until I replaced the module. Not sure what all you have tried so far though.

That is most likely a ground or the TCCM. You can grab a TCCM for 5-10 bucks at a junk yrd.

@@Alpha-Works-Tx I’m gonna clean the ground tomorrow I just let it reset by unhook both battery terminals and let it set for a hour

Typically these symptoms lead to the TCCM being bad. Checking the free stuff and also your transfer case harness doesn’t hurt either some have found that the connectors at the transfer case were wet.

Try the free stuff first and work off of that. It usually comes down to process of elimination.

Check the free stuff like fuses and grounds. If that doesn’t work get a junk yard switch and TCCM for 10 bucks.

It’s a PIA honestly, and the hard part about it is there are so many different fixes.

Mine is still working good from the TCCM fix.

I also did a update video with the 3 most asked questions that might help.

The red seat belt light flashing?

Unless your asking about the selector switch which flashes all lights then shows which mode the transfer case is in.

Was* and I meant all the lights on the selector switch

Yes the switch does a cycle then stops on the mode it is in. When I had issues with the tcm it only cycled the lights sometimes and other times it did not work at all.

@@Alpha-Works-Tx cool, will try the few hrs reset