My speedo, tach, gas guage, temp gauge and odometer stopped working. At the same time, my transmission stopped downshifting to low and won't go into overdrive and the key is stuck in the ignition.
Sounds like you need a new car.
With joking aside, the problem with your speedo, tach, gas guage, temp gauge and odometer can probably be one of two things. Check your fuses. If they are fine you may need to replace your cluster panel. I had to have the entire thing changed over my speedo not working right. It was not cheap. You might want to check the relay box under the hood. Does your transmission leak? Check the fuses and relay on it also. Get a new ignition switch and replace the old one if your key is stuck. You can try WD40 on that key but don't expect any miracles. The bearings are likely shot. Sorry I posted all of this bad news. Good luck.
Testimonial: "Thank you! I took it to the GMC dealership. Turned out to be the ignition, or they said a switch in the ignition. I ended up trading it in while I was there. So I did take your advice on a new car as well. Thanks again!"
SOURCE: 1998 GMC Jimmy
sounds like the computer has a glitch. you might need to go to the dealer to have the computer trained(reprogrammed) or to see if you need a new one.
SOURCE: electrical ?
probally need to check engine groundwires. clean all terminals. battery may have loose terminal.
SOURCE: tac,speedo and transmission indicator bar stopped working
This trans is computer controled if your gages quit working as well I would start checking fuses and relays. If this doesn't provide a solution let me know and I will get my manual out and go a little deeper.
SOURCE: tranmission and instrument cluster
The speed sensor on your trans sends a signal to the electronics telling it when to shift, this will be where you fault is.
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