Duramax Lifetime Supporter
Join Date: Oct 2016
Location: Maurice, LA
It is usually a connection issue at the Coolant temp sensor. It is located just to the left of the thermostat housing as you aer looking in the engine bay from the front.
It can also be the sensor itself but most often a connection issue.
I sometimes get that code on cold mornings after compressing the wires to the lead when replacing the thermostat housing. (I know, I goofed) I clear it and it does not reoccur til the morning temps is cold again.
2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
Last edited by 407driver; 10-19-2019 at 08:01 AM.