Urgent! Trailblazer won't move!

[joedarr33]

Ok so I'm away from my house right now, I got stuck and attempted to go into 4wd. When doing so it wouldn't shift into it so I tried to go back to 2wd. And it wouldn't, the light just kept flashing and wouldn't do it then nothing would get selected. When I then the selector it makes a noise trying to switch but just won't go into anything. Idk what it, transfer case? Help!

[Trail X]

So, when you are in drive, and press the accelerator, what happens? Does the engine just rev up and not move the tires? Or are you stuck in mud/snow and no matter how hard your tires spin you won't move?

More information would be helpful.

Often the transfer case light may blink, but you often still have power transfer to the ground, at least through the rear wheels.

Did you try to go into 4HI, or 4LO? That makes a difference.

If you tried to go into 4HI, you should still have power to the rear wheels regardless. If you tried to go into 4LO, it's possible that your transfer case is stuck in neutral. But more likely -if you were trying to go into 4LO, you have to put your transmission into the neutral before the transfer case will switch ranges - otherwise it will just blink at you.

Come back with more information and we can hopefully help you our of your situation.

[joedarr33]

So, when you are in drive, and press the accelerator, what happens? Does the engine just rev up and not move the tires? Or are you stuck in mud/snow and no matter how hard your tires spin you won't move?

More information would be helpful.

Often the transfer case light may blink, but you often still have power transfer to the ground, at least through the rear wheels.

Did you try to go into 4HI, or 4LO? That makes a difference.

If you tried to go into 4HI, you should still have power to the rear wheels regardless. If you tried to go into 4LO, it's possible that your transfer case is stuck in neutral. But more likely -if you were trying to go into 4LO, you have to put your transmission into the neutral before the transfer case will switch ranges - otherwise it will just blink at you.

Come back with more information and we can hopefully help you our of your situation.

Im not stuck im on asphalt now because I pushed it out. The engine just rev's up and doesn't do anything, its acts like its stuck in neutral. It wont go into 2wd/4wd hi or low. Nothing will make it move lol.

I cant remember if I was going to hi or low to be honest with you, I was just trying to get it out of the spot it was in. Is there any way I could get it unstuck from neutral?

[Wahugg]

From my understanding you can unbolt the TCCM and manually select 2hi.

-Wahugg

[joedarr33]

From my understanding you can unbolt the TCCM and manually select 2hi.

-Wahugg

This would be something I need to do! To atleast get home. Can I just unbolt it and push a lever towards the front?

[joedarr33]

anyways, I have reset the battery. Also when putting it back into park while its running it will make a horrible sound for a second.

[dvanbramer88]

anyways, I have reset the battery. Also when putting it back into park while its running it will make a horrible sound for a second.

Thats because the back half of the transmission isn't connected to anything to stop it from spinning like the brakes. Its turning when you throw it in park.


Did disconnecting the battery work? I've seen that fix a transfercase no shift issue on other GMTs.

[joedarr33]

it didn't work unfortunately. I have done everything i can, i have no clue what it is or what to even check Honestly. I can replace stuff but i cannot diagnose anything to save my life. I unplugged #8 and reset the battery for 30 minutes. Didn't work.

[dvanbramer88]

My friend's Yukon's transfercase got stuck in neutral at Rousch Creek. A broken wire was the culprit. The wire harness ended up in the path of the front drive shaft and it broke a wire. We fixed the broken wire and was good to to.

So, check to make sure all the plugs in the transfercase are plugged in, the wire are out of the way and undamaged. Outside of that, I got nothing. Maybe this will be helpful.

http://www.offroadtb.com/articles/tech- ... operation/

[joedarr33]

My friend's Yukon's transfercase got stuck in neutral at Rousch Creek. A broken wire was the culprit. The wire harness ended up in the path of the front drive shaft and it broke a wire. We fixed the broken wire and was good to to.

So, check to make sure all the plugs in the transfercase are plugged in, the wire are out of the way and undamaged. Outside of that, I got nothing. Maybe this will be helpful.

http://www.offroadtb.com/articles/tech- ... operation/

i just went there with my jeep a month ago, anyways thanks! i really hope thats all it is. Damn electric stuff man, i like my older vehicles with manual shift it into 4wd. Not this switch SH**.


Im going to work on it tomorrow and hope its just a wire/

[The Roadie]

I can replace stuff but i cannot diagnose anything to save my life.

That's a situation that you should work on with training, reading, and more reading. About automotive systems and electrical theory. Else for the rest of your life it's gonna cost ya. And you'll be at the tender mercy of strangers who went to the trouble of getting that training. From relatives or buddies or the library or Youtube videos. [Dad mode on] Once you have a sense of curiosity instilled in you, or discover it naturally, you'll realize that NOBODY can do anything you can't do except they have more training, experience, special tool, or the shop manual.

[Trail X]

First of all, what exactly is the lights on the 4WD switch doing. Especially, where is the light in relation to the knob being turned. Sometimes it will stay blinking on one mode, or it will follow the knob. Which light is it blinking on? Is there a lighted red N lit on the switch?

Second, do you hear any of the whines of the two electric motors that spool at various stages of the TC modes? For instance, when switching from 2WD to 4WD, you should hear two electric motors spool up for a short period. There is one lower pitch motor nearly under the driver seat that makes a very fast change. There is also a higher pitch motor that spools for 1-2 seconds in the passenger side wheel well. Check to see if you hear both of those motors spool (you will either need a second person, or turn the engine off when you do this).

Wallace, there is no real way to unbolt the shift motor and operate it manually. The shaft that is turned by the shift motor requires the motor assembly's brake to keep it from drifting out of gear selection. I wouldn't drive it without the motor attached to the case.

[joedarr33]

First of all, what exactly is the lights on the 4WD switch doing. Especially, where is the light in relation to the knob being turned. Sometimes it will stay blinking on one mode, or it will follow the knob. Which light is it blinking on? Is there a lighted red N lit on the switch?

Second, do you hear any of the whines of the two electric motors that spool at various stages of the TC modes? For instance, when switching from 2WD to 4WD, you should hear two electric motors spool up for a short period. There is one lower pitch motor nearly under the driver seat that makes a very fast change. There is also a higher pitch motor that spools for 1-2 seconds in the passenger side wheel well. Check to see if you hear both of those motors spool (you will either need a second person, or turn the engine off when you do this).

Wallace, there is no real way to unbolt the shift motor and operate it manually. The shaft that is turned by the shift motor requires the motor assembly's brake to keep it from drifting out of gear selection. I wouldn't drive it without the motor attached to the case.

Ok, when i turn the light to any of them say 2hi, it will blink for about ten seconds and then it stops and there will be nothing illuminated at all (no lights at all)

When i put it in neutral and turn it to say 2hi or any of them it will make one noise for about 6-8 seconds id say. The noise sounds like an electric motor. Not very loud or anything (i can't hear it when i have the heat or something on).

It acts as if its in neutral.

[Trail X]

The switch light feedback signals seem odd. Normally there is at least one blinking light or one solid light at all times. To me it sounds like a module problem for that reason alone. Or the other alternative is that somehow the encoder on the TCC motor stopped reporting the motor position to the module, so the module has no idea where the motor is located, and therefore will not report a position to the driver. In theory, that could be it, but I've never seen this.

Does the correct light blink when you switch the selector knob? Do you get all 4 orange lights and the red N lit up upon the initial key-on lamp check?

Do you know anyone with a 4WD trailblazer or envoy? If so, see if you can swap out the transfer case motor real quick to help you troubleshoot. Really, all you need to do is take their motor off of their truck, and plug it into yours (don't even need to mount it to your transfer case). If the lights start working and reporting a position, then that is good enough evidence that I would buy a new transfer case motor.