Hi, I have a 99 Suburban that has a check gauges lit up and the gauges don't work (no speedo/tech fuel gauge jumps around)and the trans doesn't shift and no overdrive. I can shift it manually 1st 2nd 3rd but still no overdrive. It has trouble codes for the shift solenoids and tcc but I don't want to change parts that I don't need too.Any ideas what is the cause. Thanks

 

So I cant find any grounding issues but I got the codes read P1860,P0758,P0740 and P0753. They are solenoid codes. I was told it might be the ignition switch does that sound right.

 

i'm having the same exact problem as you did did you get any results...please help

 

I have a buddy who has a 95 Silverado and he's got the same issue. He was told by a shop in town that it was the gauge cluster. I've been looking for a used one to see if that works but no luck yet finding one.

 

Sounds like the ignition switch is not powering up the trans or the instrument cluster. It is from the era where they had that problem.

 

wow you guys were right, on my questions about all the codes that came up I changed the ignition switch and it seemed to fix that problem but now I hear a clicking sound coming from the fuse panel already change the flasher unit and directional switch but on occasions it starts clicking....anybody have anything....thanks

 

its a rear wheel speed sensor not getting power, check your power sources and you will find the issue, could be problems from ignition to short in wire harness.