You might be one of the few lucky ones that still have a bit to go. Mine was mint. 153k shifted like butter held good voltage never did anything that could lead to believing their was any sort of power issue laying ahead. Than the piece of shit original battery terminal magically came loose about a month after I installed a second battery (system added to car) making sure EVERYTHING was tight. While I was driving at 55 mph pitch dark on a road people love to speed on, in a black cobalt. I guess the wire began to Move, leading to sparks. Or something. Damn thing died no warning no nothing. PS gone brakes were gone, thank god for E-brakes. About 3 minutes later after looking under the hood and in trunk I couldn’t figure out why or what had happened. Got in. Sure enough. Cranked right up. As soon as I hit 7 mph, low power mode. Misfire than dead. Made it 10 feet. One last time, waited. Boom there it was again. I slammed the gas for an attempt to make it to the DG about 110 yards away. Shit I made it, but oh boy did the car JUST stop before hitting the concrete Curb as high as the dogs sit. What I came to find out is, the cobalt is known to have these electrical problems. It’s 94% chance all cobalts will go threw this problem. And everytime its a different reasoning behind it. Mostly being ground deterioration somewhere threw the vehicle. In my case a still energized power touched the frame of the car. Knocking out the weakest ground in the link, speeding up my cobalts road to failure, Many owners junked the vehicle when gone unsolved or traded it in when learning of the issue. My buddy’s 06 N/A SS is acting up doing the same banging into gears, hesitations on shifting, stalling under brakeing at idol periodically, thinking some sensor was going bad. In electronics there’s no going bad. If it’s time it’s time. Right than and there it’s gone. This has been such a confusing road pointing to problems that were soon dropped as it simply didn’t add up.at first 4 fuses lacked power not allowing my vehicle to even attempt turning over, fed tapped power line to distributing fuse of the 4 they were in line thank god. Flip my toggle switch. Holy shit, problem solved. But ac is no longer cold, compressor don’t activate. One day grandfather had an idea, fed power line to relay lacking power. Keep toggle off, holy shit. Car starts on its own again! Than transmission issue became a factor. Ran rich, bogged down always wanted to die. So we put the power back to the fuses. TC light stayed lit, and transmission problems seemed a little worse. for some near impossible reasons, 4 powers were in a relay. How?¿? Well. Found some leads on here. Added a ground to ECU BCM TCM and toggled the ground to the relay with 4 powers(had too, blower fans would not deactivate. They stayed running once ground contact was presented., focused on G101 and G105 while still checking the rest sanded the batteries ground point moved wire harness away from the oil filter while checking for damaged wire. My voltage went back up,but still no start on its own and transmission issues. Than pop got into it checking over grounds I missed and disconnected/ connected some things. Near 4 hours later. It’s back to running the way it did when I first got it. And without a toggle switch needing to start it (toggle currently breaks ground to ensure blower motors turn off, instead of killing my batteries, started no issue without added ground toggle) he’s never seen a car act like this. He simply didn’t understand at first. But now we understand. And we solve.
