4x4 problems

jayall23 · Post by **jayall23** » Tue Oct 07, 2003 8:14 pm

My truck will not shift into 4hi. 2hi works great, 4lo works great however 4 hi will not engage. fluids look fine, fuses fine, button flashes like it wants to engage but always goes back to 2hi. Could it be the button, or worse ?

AZS10Crew · Post by **AZS10Crew** » Tue Oct 07, 2003 9:22 pm

This may be a stupid question (see my sig

) but are you traveling down the road when you press the button or are you stopped? I think sometimes 4HI may not engage when the truck isn't moving.

Just a guess.

quickbiker · Post by **quickbiker** » Wed Oct 08, 2003 4:17 am

If you are doing everything correctly to shift, then there is a diagnostic to perform to see where it's at. Mine did the same thing, and it is the tcase control module is what the code said. But most times it is the encoder motor. And you can reset the module to see if that fixes it, but usually it's a short term fix. I've already replaced the encoder module not believing the code, but it still gave me problems. Now I have a new TCM also. So, believe the code. I can give you a run down, or you can look here. It's basically the same. And I put my pin #'s which seemed a bit different than the 1st gen: http://pub154.ezboard.com/fs10extremist ... =437.topic

I got the same SN there.

jayall23 · Post by **jayall23** » Wed Oct 08, 2003 9:25 am

I have tried to shift when I am moving, stopped, put it in neutral and nothing. I had been under the impression that I should be moving when I try to shift into 4hi, but I have tried everything and so far no luck. I will try the codes tonight

smokinjoe · Post by **smokinjoe** » Wed Oct 08, 2003 1:48 pm

i know its silly but if its under warranty take it back

NTXCrew · Post by **NTXCrew** » Wed Oct 08, 2003 2:07 pm

smokinjoe wrote:i know its silly but if its under warranty take it back

That isn't SILLY in my book...

jayall23 · Post by **jayall23** » Wed Oct 08, 2003 5:16 pm

Actually my truck is under warranty however due do a lack of chevy dealerships in my area (dealerships that will fix problems) I usually try to fix the problem if I can first. If not then take it 80 miles away to get fixed !

quickbiker · Post by **quickbiker** » Wed Oct 08, 2003 5:59 pm

Yea, that's definitely a problem I'd take back for warrenty work.

adrenalnjunky · Post by **adrenalnjunky** » Wed Oct 08, 2003 7:22 pm

Remember -- any GM dealer can fix that problem -- I would start at a GMC dealer if you have one closer, but anything GM should be able to handle the work.

smokinjoe · Post by **smokinjoe** » Thu Oct 09, 2003 1:17 pm

oh yeah if its under warranty take it in,if they mess up call gm.let them know that you have a bunch of worthless mechanics at the dealerships closest to you

TheBigFitz · Post by **TheBigFitz** » Thu Oct 09, 2003 7:32 pm

That happened to mine but when it went out I was stuck in 4HI. I finally got it back into 2HI by letting it coast in neutral and hitting the button. After that, it would not go back into 4HI at all. Turned out to be a bad encoder motor. Had it fixed under warranty.