Join Date: Dec 2012
Location: Capital Region, NY
Hello everyone. The other day my CEL came on and had the code P0128 which I am familiar with from about 2 or 3 years ago when I replaced my thermostat with an AC delco thermostat. When the light came on my coolant temperature wasn't reading above 180 F I don't believe. I'm sitting at idle right now after some driving and my coolant reads 189 F and the outside temperate is 36 F.
Does it sound like I need to replace my thermostat again?