回答“Transmission problems and rpm on 2010 Chevrolet Cobalt LT?”It's possibly your TCM module you can get one from the junkyard. Sometimes the car will calibrate to the TCM. Transmission control module. Sometimes you have to get them reprogrammed. I took two of them from the junkyard in one worked. In Florida the TCM gets too hot. This is why the transmission has problems. Also your radiator may have breached with the transmission fluid if your transmission fluid is pinkish you have a serious problem. I wouldn't add water if it's pink. in this case you'll need a new radiator possibly transmission also. Try pouring some Lucas transmission it will probably fix the problem. If it's not TCM.