loss of power / wont shift forward gears

[seventwozero]

I hopped in my truck after the gym today and noticed it seems like it isn't shifting the forward gears. I can shift from P/N/R and D, but anything past that, 1-3, you can't hear the transmission do anything. Driving around I'm not able to get it to shift either. I only life a few blocks from where I was at, so it was hard to tell where it was stuck, but it feels like 2-3rd as I don't have much torque at lower rpm's.

No error codes. No funny noises. Engine sounds the same. It drove fine to the gym, shut it off for a couple hours, turned it back on and now this!

Has anyone encountered this? Thanks.

edit:

I found this http://www.355nation.net/forum/serv...utomatic-transmission-stuck-2nd-3rd-gear.html post about a bulletin for the 05-06 H2 being stuck in 2nd or 3rd, is it possible it applies to 04 too?

UPDATE

I just heard back from the dealer, the issue was the transmission wiring harness. He didn't say exactly where, but the tech found a spot where the harness was pinched and had cracked or worn the jacket of a number of wires, causing a handful of errors. So, an entire day of shop time, parts and a $80 diagnostic fee and the problem is fixed for $450. On the plus side, this should also fix the problem I was having with my intermittent speedometer!

 

[Fish]

Haven't heard of this one before...

 

[Scarsman]

Haven't heard of this one before...

Same here. That's a new one on me. I'll be interested to hear what you find.

Sent from my C771 using Tapatalk

 

[Zach]

Have had it happen twice. First time was ignition switch and second time thought it was the same but ended up being the two shift solenoids

 

[seventwozero]

Have had it happen twice. First time was ignition switch and second time thought it was the same but ended up being the two shift solenoids

I'm fairly certain it's electrical now. I jumped in the truck this morning to take it into the dealership and it was working just fine. I decided to hold off on the dealership and get it into my regular mechanic when he has an opening. Something about bringing my truck into them when there isn't something actually wrong screams "take my money! PLEASE!!" :giggle:

 

[seventwozero]

UPDATE

I just heard back from the dealer, the issue was the transmission wiring harness. He didn't say exactly where, but the tech found a spot where the harness was pinched and had cracked or worn the jacket of a number of wires, causing a handful of errors. So, an entire day of shop time, parts and a $80 diagnostic fee and the problem is fixed for $450. On the plus side, this should also fix the problem I was having with my intermittent speedometer!

 

[bebe]

That's also the same symptoms of a disconnected or faulty VSS (vehicle speed sensor) it's the plug on your transfer case.

 

[seventwozero]

That's also the same symptoms of a disconnected or faulty VSS (vehicle speed sensor) it's the plug on your transfer case.

Thanks! I'll keep this in mind of the problem arises again. It has been very intermittent as of late. Maybe over a month since it has done it. And even when it was doing it, it was very irregular. From the looks of the plug on the transmission harness, I have a (bad) feeling there are plenty of other plugs on the underside that have been corroded because of all the road salt.