Hey thanks! Sounds like it could be a thermostat that's stuck open. Appreciate it!!
Hey Grease,
Since you have a 4.3 GM, I would first check the negative cable going to the block. Make sure it is clean and tight. The code is for engine temp low after warm up. If the ground is good, check temp sensor connector and wires. Did you remove the thermostat? Also make sure your coolant level is correct.