Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
Do you have a remote starter installed?
Does it do the same when you start with the starter?
OK, Can you check this when you get a moment?
The options I see are a bad power or ground at the back if the cluster or a failure in the cluster itself if the results of the remote starter are the same.
That is indeed a cluster issue, common on these. There are sites to repair them that are much cheaper than replacement.
http://www.speedometerrepairguy.com/ is one I know of, but you can search ebay.
I need to step away from my PC for 10 mins, just reply and I will respond then.
Not really, the signals for the transmission temp go to the transmission module, then send via the network, which sends all the other information to the cluster so if the gauge was actually that hot, you would get warnings in the dash.
the seats, that is usually a bad switch assembly or calibrations in the memory seat module.
No, but if the damage was enough it would melt the wiring beside the power outlet wiring.
The wires run in the main harness to the underhood fuse block
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