Thank you Ivan for taking your time, Very well appreciate. Many thanks.

Good fix Ivan, i bet owner is happy after going through the whole swap part+paying diagnosis and labour costs previously and now it's finally fixed.

Thank you for taking the time to do this video. Had a 2008 Trailblazer with a C0321. Spent hours chasing my tail. Watched your video's and broke out the Fluke. Step by step.. Turned out that I had only 5 volts on the orange wire going to the encoder motor. Broke open the harness and traced it back to a very small hole in the harness that moisture got in and created corrosion. Again this was a very helpful video.

Another great video,looks like he's trying to get you all the complicated diagnostic cases. Good work on the trace!

The original diagnostician was so close to the actual problem. It's sad that so many people think that a part HAS to be replaced whenever they encounter problems with a vehicle. Now, with all the "NEW" cheap replacement parts in this Envoy, there will only likely be more problems down the road. Computer system diagnosis actually isn't that difficult with the proper wiring diagrams and understanding of how the system is supposed to work. Great job, Ivan!

It always intrigues me as how the "fault fairy" manages to find the most awkward and almost inaccessible places to create the faults in the first place, well done Ivan. Superb vid.

I have been working on my 2004 envoy for months this video help me alot I have had 3 different mechanics look at it they sure won't to start changing parts and I still have nothing but I think your video will help keep up the great work you are a great mechanic

Your a good detective Ivan. That was quiet a research project for the correction you accomplished. But that's how it goes on cars these days so thanks. We all learned something on that one.

Great diag as always. Had to laugh when you still got the check 4wh light after wire and module. I thought that only happened on Vw’s!

Like someone else said in part 1, watching this series really makes you appreciate the old manual levers and manual hubs for 4wd engagement. My 4Runner is kind of a mixed system, with a button for 4-High, and then a shifter to select neutral or low-range in the T-case, with a vacuum based Auto Diff Disconnect setup instead of manual hubs. Thankfully never an issue with any of it 21 years on, or even the rear diff lock actuator!

Excellent job young Skywalker. The force is with you,master Yodakeith to be specific.

Sweet diagnosis Ivan. Man, that came right down to the wire! lol I could see that you were rushing but I guess that's the Staten Island mindset. Thanks!

Thank you Ivan for taking the time to put this video up!! Nice work !!!!

I have a lever on the floor. I guess that makes my right hand the "Transfer case actuator module". Always works!

Thanks Ivan great video thanks for sharing your experience thanks again for your help and sharing your knowledge thanks

Excellent job Ivan!! That sure kept you on your toes lol

Way too many accessories , modules , wiring doodads etc. etc. etc. on vehicles today . And way to many mechanics with parts cannons to shoot at them . Eyes rolling , TheReaper!

Nice diagnosis, man!

Guest appearance by Keith the wire tugger 😂 great work Ivan

Hi Ivan. Great diagnosis. Hey you don't know what's going on with Eric O do ya. He's not making to many videos anymore. I hope all is well and he's just busy as heck. Keep up up the great videos bud. You are one of the most skilled diagnostic techs I've seen! You rock! Jpol

Fantastic Ivan and good to see keiths smiling face as well. Kinda cheap on the heat shrink lol. I like your test light by the way very good way to fully load the circuit. Hope he is feeding you well while your up there lol.

What a spot for a wire to break how, why did it break that's a tough place to get to, great video Ivan

for 4 Lo check the manual. Great video. Thanks for sharing.

Great work lead me right to my issue dam near same location on the break

Great job Ivan

Incredible work I need to bring my truck to you.

That was a good one , nice of Kieth stopping by! Well what we learned here is that , dorman sucks , and unfortunately the shop that replaced the parts and did not seal the wire holes probably made more money than you and fixed nothing.... how do they sleep at night?

Nicely done sir.

Nice work my friend

great Detective Work

Glad I watched this very very informative. BTW I have the exact same radio in my ‘02 trailblazer so weird cause I bought it that way, used.

Great video Ivan. Check out TSB 02-04-21-006E No Comm with TCCM has you wake up the module and check for codes. TSBs are your friend! OK now that Part II came out I can disclose the C0550 is ECU/CCU and checksum test failed meaning Dorman module internal; failure DOA...no pulse...DNR!! Nice diagnosis on C0321 DTC. Someone set the parts cannon on continuous fire. With that corrosion I bet they had 12V on an unloaded circuit at the solenoid & module so they replaced the solenoid and then when it failed they replaced the module or vice versa. Loaded circuit test would have saved some $$ for sure but luckily they turned it over to Keith & you and BOOM fixed! Nice video Ivan!

Very helpful video. Now i need that snap master brain box.

How about a close-up and explanation of your tail-light variable amp test set-up? That would be some nice bonus footage!

Thank-you for the great video..., You helped me learn :)

nice work, I have 02 Chevy trailblazer, I nicknamed it RED NIGHTMARE🤤

Excellent job.

On a BMW the curb mirror assist is only on the passenger side mirror, not on the driver side mirror. Also the mirror select adjustment switch has to be on the passenger side mirror in order for the curb assist to work.

Dude! Your like a super hero. Wish you where around my neck of the woods (St. Louis). 2002 Envoy with bad 2002 TCCM module. Can they be repaired or can they only be replaced?

Wow, This guys awesome.

Good job... very thorough and scientific. You're a good tech. Makes me wonder how that ORN wire was cut so neatly. Wires don't just commit suicide.

nice diagnosis. thanks

No worries. We will have that warranty finished next year.

Dash switch is either corroded from non use, or broken from rapid over-usage (trying to get it working). I'd rather get out and lock the hubs manually.

pretty brave with the lighter wearing rubber gloves lol. makes ya wonder why it got the crusties and how many more wires are right behind it.

Well at the end remove the switch and spray some contact cleaning into the switch, done.

The actuator on right front axle will gum up if not exercised. It has a motor and feedback switches.

HELP!!!! When i turn the key all the lights on the switch flash on the back off. If i turn the switch to anyother possition no light comes on on the switch. If i leave it on any of the positions and turn the key off and then back on i can hear the TCCM and the Actuator up front turn on and then off. Ground & Hot is good at the Actuator, TCCM and Control Modul under the dash. Yes, I also tested the communication wire at the Control Modul. Still no lights at the switch and i have a service 4wd light on the dash. PLEASE HELP ME!!!!

I’m not sure if this has been asked before but. Can you please give details about the scanner unit from snap on you are using. Thanks from Milwaukee Wisconsin

Awesome video Ivan. You guys still use DOT3 brake fluid?

Re: bonus footage. One would think one would visually compare a new part to the old part before bolting it onto the car, but, apparently, not.

Ivan,how much time did it take you to diagnose? Also how many hours do you charge the customer?Most of the time it takes more than the standard "Hour".The customers don't understand why it costs so much and most of the time and reluctant to pay, especially after going to someone else and paying for the wrong diagnosis. In short you make it look easy,but I am sure there is a lot of other business/customer related issues going on inn the background.Thanks

My 2005 Buick Rainier V8 AWD is having intermittent AWD issues. The service AWD light will come and go, and the AWD will work at various times as well, whether or not the service light is on or not. The light will come on during my drive and AWD will stop working, then I pull over shut off the vehicle, start it and the light is gone and AWD will work for a while longer. I don't have the money right now to take it in for diagnosis. Was wondering is you or anyone in this comment section would have an idea what it could be? Any help would be much appreciated. Thanks

Hey Ivan, what probe set are you using? AES wave?

Спасибо.

good job

Ivan, have you considered a family move to Staten Island, or close by? Looks like all the people and animals in Pine Hollow don't have enough electronics to keep you busy there!

Dorman? Noooo! Had a Dodge Ram with intermittent stalling that appeared to be caused by an IAC that could not maintain an idle. Repaced with Dorman IAC. The exact same fault occurred in exactly the same way. After a lot of wasted time replaced IAC with Wells unit ...truck fixed. You tell me what are the chances of Dorman's faulty new part being exactly the same as the broken Mopar part. One in thousands, I think I'll go buy a lotto ticket.

let's face it 90% + of these vehicles never see 4 low, what sucks about the switch system is even if you do sometimes use 4 low you just can't count on it when you do need it

I have two lights on my dash - one is the traction control icon with a tool. The other is the tracking control. light Is that something related to the 4x4 too?

2003 gmc 4wd ligh on the switch does not change and the suv does not run more that 30 milles the gear does not change

I hate it when someone punches the wire insulation then doesn't even bother to make a repair and seal the wire insulation. Makes trouble for other repair technicians.

It's a real shame when discovered parts were replaced, and it was a Dorman, you condemned it immediately. But you ended up putting another Dorman in.

How fix 50 ext ambient temperature

Does that actuator cycle every time you cycle the key?

First!!! (finally) still watching the video ;)

Thanks Ivan for all your hard work and educating us. Want to send u gift to say thank you, what is the best way to send it patreon or PayPal cheers sandy

Keith does have a problem with premature tugging😁😁😁😁 and other things but this is not the place to talk about it

It's not Rockauto or any other parts suppliers fault someone orders and installs the wrong parts. Whoever purchased those mirrors was to lazy to research the part numbers on actual gm parts websites.

I guess this why so many people in N.Y. & p.a. walk or take a cab owning a car in these 2 shit holes just ain't worth the headache lol

Green is my favourite colour 💵💰💵💰💵

Nothing like firing the parts cannon with defective balls.

Great video except the thumbnail lol. Less Keith and more Ivan I say

This is why I hate automated transfer cases just put a damn shifter through the floor arggg better yet just go with 2wd the end

Plasti Dip is the same thing as liquid electrical tape. If you want to save some money.

😁😁😁

a 4wd lever would be alot more simple !

That’s your problem lady

Green Crusties. I hate this stuff.

the owner replaced so many parts...he should have replaced the whole car!

Where can I get a wiring diagram for the evap system for an 06 envoy xl?

Bro I dont understant tcm is faulty in 1 video how you retrive the code from obd2 socket? I dont understant about CAN comunication code

POOR CUSTOMER...

Ok

DORMAAAAAAAAAAN

So the original dorman module was defective because of no communication? You have dirt on your chin, lol.

Harbor Freight, yo

HOT TIP per GM SERVICE INFO: "IMPORTANT: After transfer case shift control module replacement and reprogramming, ensure all doors are closed and the key is out of the ignition, then open and close the doors again and wait 2 minutes to avoid setting false DTCs."