mrpeterclark
Full Access Member
2007 GMC Yukon XL Denali 6L80
Transmission replaced with remanufactured unit last year. Manual shift mode has not worked ever since. I've had it back in the shop regularly to trouble shoot, pick up on the weekend, take it back. According to the shop: the shift buttons signal registers, but something is interrupting it in the computer. They have replaced the TCM, BCM, Shift Lever, had a programmer come in, etc. Programmer was supposed to come back this week, but didn't show, so I'm taking it back again next week. Tow haul button works. If you shift into M it will register and display the gear and hold that gear. No clue. I recently started getting a service suspension system message. I think it's probably the air ride. I did a Magneride and Air-ride delete sometime after the new transmission went it. The compressor would kick on when I started it for a while, but it quit. I haven't really investigated that at all. They think maybe that's interrupting it? It wasn't an issue before. I've also had the dreaded intermittent service stabilitrak service traction control message. I think I've exhausted about every option for that. It hasn't come on lately, but it kind of came and went randomly before 3 transmissions ago. I've done everything I could find for that little issue and maybe finally have it fixed - just replaced the coils and plugs, i've replaced the throttle body, delete sensors on all the magneride and air ride, replaced wheel speed sensors, replaced the VVT solenoid, there's more I've forgotten I'm sure. Now I have this new suspension system message. maybe that's it, but I had hella check engine lights and messages before and never had issues with the manual transmission button.
For what it's worth I had the transmission rebuilt prior to this (by the same place) and it lasted 3 months. I had asked them to program the speedometer for larger tires (33s). They couldn't get it to program. When I got it back that time I tried to use a tuner and couldn't get it to work either. I thought it was probably that the tuner wasn't compatible and returned it and they just weren't trying. When I got the new transmission, I was able to adjust the speedometer with a tuner no problem (it was a different brand).
It's driving me crazy. It's not a huge deal to just drive in automatic, but we live in the mountains and I tow occasionally and being able to adjust it is helpful at times.
Transmission replaced with remanufactured unit last year. Manual shift mode has not worked ever since. I've had it back in the shop regularly to trouble shoot, pick up on the weekend, take it back. According to the shop: the shift buttons signal registers, but something is interrupting it in the computer. They have replaced the TCM, BCM, Shift Lever, had a programmer come in, etc. Programmer was supposed to come back this week, but didn't show, so I'm taking it back again next week. Tow haul button works. If you shift into M it will register and display the gear and hold that gear. No clue. I recently started getting a service suspension system message. I think it's probably the air ride. I did a Magneride and Air-ride delete sometime after the new transmission went it. The compressor would kick on when I started it for a while, but it quit. I haven't really investigated that at all. They think maybe that's interrupting it? It wasn't an issue before. I've also had the dreaded intermittent service stabilitrak service traction control message. I think I've exhausted about every option for that. It hasn't come on lately, but it kind of came and went randomly before 3 transmissions ago. I've done everything I could find for that little issue and maybe finally have it fixed - just replaced the coils and plugs, i've replaced the throttle body, delete sensors on all the magneride and air ride, replaced wheel speed sensors, replaced the VVT solenoid, there's more I've forgotten I'm sure. Now I have this new suspension system message. maybe that's it, but I had hella check engine lights and messages before and never had issues with the manual transmission button.
For what it's worth I had the transmission rebuilt prior to this (by the same place) and it lasted 3 months. I had asked them to program the speedometer for larger tires (33s). They couldn't get it to program. When I got it back that time I tried to use a tuner and couldn't get it to work either. I thought it was probably that the tuner wasn't compatible and returned it and they just weren't trying. When I got the new transmission, I was able to adjust the speedometer with a tuner no problem (it was a different brand).
It's driving me crazy. It's not a huge deal to just drive in automatic, but we live in the mountains and I tow occasionally and being able to adjust it is helpful at times.
