So yesterday I bought this cobalt for 200 bucks. has 120k. It was stranded at a gas station where the previous owner shut it off to pump gas and it wouldn't turn back on. The previous owner said it had been acting weird for about a week not wanting to start, the speedometer would randomly clunk out, and the transmission wouldn't shift. I jumped the starter posts to get the car started and take it home, so the starter IS good. I checked all the relays, not ALL of the fuses yet but all of the relays on the car are good. The battery fuse is good, the connections to and from the starter are good. The transmission seems healthy and the fluid was at a good level and good color. The car also blinks fast for the turn signals both left and right as if a bulb is out but both sides work front and back fine. I also noticed while the speedo isn't working the RPM's are, and the odometer isn't going up like it's frozen. I'm pretty sure the transmission is in limp mode but I am not familiar enough with Cobalts to know if there should be a dash light or sign other than not shifting. It seems it instantly goes to third gear when you put her in drive. Reverse works, and Low gear puts it in the same gear drive does, which is DEFINITELY not 1st, as I was at about 3-4k around 35-45mph. Key on I get all dash lights and good power, however I notice my fuel pump also doesn't kick in key on. Engine runs AMAZING. I did get a code for a lost connection to TCM, which would explain limp mode. So anybody with a little Cobalt know how have any idea? Think there is a bad ground completely obliterating all of my electronics? I heard that the fuse board can crack and cause weird problems on these cars. Could a faulty TCM actually cause ALL of these weird problems? I figure it has to be from the fuse board as from my knowledge the only thing that separates the starter from the battery is the fuse board and the relay specifically for it, other than the ignition switch position. I figure my switch is good as they key was on start position when I jumped the posts as I didn't want to risk jumping security. Any shots in the dark before I tear into it? I was originally planning on scrapping the car, but with so low miles and such a beautiful interior and engine bay, it would be a shame to kill a car with so much life left.