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My engine coolant temperature guage and DIC readings were fluctuating between low and running temp simultaneously. When it read low, the car did not run well. Now it won't start at all and the DIC is displaying Engine Coolant Temp Low. I am not getting a bad code relating to the Temp Sending Unit. The only codes I am getting are as follows:
40 BCM B2578 RF Turn Signal Monitor Circuit (Short to Voltage)
40 BCM B2583 LF Turn Signal Monitor Circuit (Short to Voltage)
AOLDCM U1064 Loss of Communications with BCM
Whenever you see "loss of communication" errors, it's likely a loose ground,
or a computer on its way out.
Pull up the cover panel on the passenger footwell, and make sure that all
the ground wires to the body are snug, no connectors are loose on any of
the modules, and all the modules are firmly bolted down.