I had this problem with my 07 Chevrolet Trailblazer. Before you buy all sorts of replacement, check the connections first at the TCCM controler (the small box underneath your steering wheel) and make sure they are properly seated and pressed down on the connectors. You can use a zip tie to properly secure 3 connectors. I did this fix and the selector switch worked right away. Thank me later.

PSA, if you still have the truck and get really bad MPG's you should replace all your coil packs. I bought a 03 Trailblazer nearly a decade ago with a little over 200k miles on it and I typically got a calculated (miles driven divided by gallons to refill) MPG of 14.5 MPG driving to work and back which dropped to 13.8 MPG when only driving to town and back, with one random 16.5 MPG one time on an all highway tank, well long story short I (now at 245k miles) started to feel a miss one night when out driving, I went on Amazon and bought a cheap set of replacement coil packs for like $80 shipped, I put them in and drove a nearly 900 mile road trip over the course of the following week, on that trip I had a 4 tank average of 20.3 MPG, an 18% increase over my previous best and a like 30-40% increase over my normal daily driving. now at almost 247k miles on the odometer the truck is running stronger and with higher gas mileage then the whole time i've owned it, now I'm attempting to solve my 4WD issues so I can get this truck back to 100%.

Good video man. we will like to see it the 4x4 working.

Thanks for the video mine was actaclly the same issue only no indicator lights working at all and Service 4WD indicator light on. I am going to try this out found your aftermarket switch on Amazon for $24 and might as well try before taking it to the dealer :) Lets hope it works I miss my 4x4 in Iowa!!!!

Most Vehicles should be shifted into neutral for 4 low

$25 at Oreilly;s for the switch, then the controller, too? Why did you switch both? You showed it in 2 wheel drive but then didn't see if it switched into the other 4 wheel high and low or auto? So you replaced 2 parts so you don't know which part failed?

I have 02 tb LText & yes , it's a petro monger, no doubt, no matter what anyone says, 😂👍!!

I have no lights on my 4X4 selector on my 02 Envoy. Did you replace both the selector and the TCCM?

I have a problem and can't seem to find it. My 2002 TB I6 4x4, while driving in 2HI, it'll go like into ( feel like neutral ) although still in gear. I have to stop then and adjust the switch to A4WD before she'll will move again. Then she'll drive fine again, but as soon as I switch her to 2HI, a while after, the same happens again. The oil level is correct... I also found that when I switch the transfer case to Neutral, I can still move her when I select D or R... Could the problem be the shift motor? Would appreciate the help.

how to tell if your transfer case is going bad in a 2002 trailblazer

You have to put the shifter in neutral whenever you switch 4x4 settings! My 06 TB front end doesn't engage I can hear the actuator moving. The rear end locks up how it should. When I put it in 4 low it drops the gearing down but still doesn't engage the front end? Anyone have that problem? Thank you!

I just drive it for a few miles when its stuck and park, turn off, and turn on and whala it works back to 2wheel from 4H. Tested several times and still works, next try the actuator.

I seen it said you were in 2wd but does the 4x4 work now?

try the transfer case shift motor

Pulled fuse number 8 25b 4 2 min works great 4 now! 2002 trailbllazer

My 2003 trailblazer was stuck in 4lo. I put it in neutral, let the vehicle roll a little backwards and that solved the problem.

Mines is 2002 ltz 4×4 6 strong lil big gas chugging always something happening I won't be specifics but a ford a Chevy or Chevrolet Tesla Honda if u need lil maintenance and better than 9 on road highway 11

If you set it to 2 hi and flick the key on and off it will switch. Short term fix, it will get it out of 4hi.

So you changed the swtich and what else (tcc

Gas hog?!?!?! haha youre funny. I have an 03 Trailblazer LTZ as well as an 03 Yukon SLT and the TB is a sipper with the 4.2 inline 6cyl. compared to the 5.3 V8 pushing around the 6,000lb truck. If you are that crunched for good MPG's then get a 1992 Geo storm my friend. They had a nice little 1.0 liter 3 cylinder putt putt motor which cost $20 to fill in todays market!!! haha. Just think about a few things...

When I switch myne to the right I just noticed yesterday that it will turn a radio bit to the right and bounce back when I let the button go. What is that mode do

Why didn't you check it to see if it was fixed ? You didn't even cycle it to see if it engaged in all positions... for the record, most Dorman stuff is junk, use OEM things when possible it will last much longer !!!

You don't know what fixed it? Going to do one today. I've decided to just replace the TCCM. But it could be the switch. And it could also be the transfer case shift motor. Gonna get expensive for my customer but I'm not sure what the problem is yet. I'll report back.

thank you for helping me thanks ??

If it doesn't work after put some gear oil in it

they say after installing the TCCM module you have to get it programmed? is that really necessary?

Your actuator is out I'm don't know exactly the name of it but there is a device on the side of the driver side if you open up where the fuses would be there is a black electronic board that has three plugins to it that could be going out or they actuator down by the transmission is going out I write a common thing that the wire power wire to it ends up breaking because it rubs on the frame of the car she might want to check the hot wire that runs underneath your car down to your actuator somewhere in there it could be broke to where the actuator is not getting power to turn it to 4hi 4lo in all of that I would definitely check the wire that has been everybody's problem is the wire rubbing on the frame and breaking underneath the car you got to follow it from the actuator on the transmission you'll see the little actuator it looks like a starter to me then you follow the wires that are coming off of it and you follow it all the way through the frame of the car underneath and you just keep doing that and somewhere there's going to be a wire broke you have power to the switch as you could see cuz I'm mine I have no power to my switch at all and mine is the wire being broke and I need a new board circuit board there like 30 bucks and that's the board I'm talking about the side of the driver side that you need to replace but you have power to yours so that means somewhere from that switch down to that actuator you have the broken wire somewhere I guarantee you you fix that wire and then that's going to start working again

How is that a gas hog put new plugs an wires in it my 06 don't eat gas at all an I have the heads built bigger cam gibson exhaust header I can hang with ss ones an get good gas mileage

how in the world you gonna get one switch selector from china? get it from USA by checking the USA box on ebay

I have a 2006 Chevy trailblazer /I put actuator and new selector switch /worked one plowing now it stuck in auto

Ok, so i own the same year and model vehicle, currently when on the vehicle has no lights on the transfer switch on. None. Last time 4x4 engaged was over 9 mo ago, worked wo problems then. All other electric is good and working. Do you think the problem is the switch or something more diabolical? Only 30-40 dollars for a new switch, maybe swap it out and move from there? What do you think?

6 min of my life I wont get back.

Gtta put the truck in neutral

These stupid electronic 4x4 shifter are garbage design. What was wrong with the shift lever in the floor? More to go wrong and have to take to dealer I guess. And they don't care as long as the design gets the vehicle out of warranty

You're supposed to put it in neutral before you switch them switches into any gears

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