Suburban 1/2 Ton 2WD V8-5.3L VIN T (2004)
Temperature Sensor (Gauge): Description and Operation
ENGINE COOLANT TEMPERATURE GAGE
The IPC displays the engine coolant temperature as determined by the powertrain control module (PCM). The IPC receives a class 2 message from the
PCM indicating the engine coolant temperature. The engine coolant temperature gage defaults to 75°C (160°F) or below when:
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The PCM detects a malfunction in the engine coolant temperature sensor circuit.
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The IPC detects a loss of class 2 communication with the PCM.
