2001 malibu code 128

code 128 . just need to now if anyone knows what this code is and what to do. to fix it

Don't know, there is usually a letter preceding the number, example P0300.

po128 i have to pull the code and then will post what it says. i do know the cooling funs and the temp gage reads zero untill i clear the code.

Coolant temp below normal, usually a bad thermostat.