Its a bad low coolant sensor. Common on these Chevy models.
Low coolant
on a 2002 Chevy silverado with a 4.6 liter v6 where is the coolant sensor for low coolant. I have a light on and check the overflow and their is coolant but don't know if their is another one or not.
Well, the common cause for the light coming on is the radiator is low of coolant. But I assume you have checked the coolant level and it is ok. That being the case more than likely the coolant level sensor is defective and needs replacing. Can also be the problem is in the wiring.
Have vehicle scanned to determine problem and recover codes Could be a bad coolant temperature sensor
Low coolant in coolant recovery tank or radiator or defective sensor
That requires an OBDII engine scanner.
There is a sensor either in the coolant recovery jug or the radiator side tank that is defective.
bad coolant level sensor in either side or bottom of plasit coolant resivoir,
Disconnect the negative on the battery terminal for 15 seconds.
you are low on coolant.
unplug your battery for 15 minutes and it will go off
Defective sensor? Usually in coolant recovery trank