CTS V8-5.7L VIN P (2004)
Temperature Gauge: Description and Operation
ENGINE COOLANT TEMPERATURE GAGE
The ECM sends the coolant temperature to the BCM via class 2. The IPC displays the engine coolant temperature as determined by the BCM. The IPC
receives a class 2 message from the BCM indicating the engine coolant temperature. The engine coolant temperature gage, if equipped, defaults to 75°C
(160°F) or below if:
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The ECM detects a malfunction in the engine coolant temperature sensor circuit.
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The IPC detects a loss of class 2 communications with the BCM.
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The BCM detects a loss of class 2 communications with the ECM.
Refer to Cooling System Description and Operation in Cooling System for more information.