Transmission Fluid Temperature Gauge

The auxiliary gauge module displays the transmission fluid temperature based on the information from the transmission control module (TCM) on an automatic transmission vehicle or from the engine control module (ECM) on an manual transmission vehicle. The ECM or the TCM sends the transmission fluid temperature information via serial data to the BCM. The BCM then sends the transmission fluid temperature information via serial data to the auxiliary gauge module in order to display the transmission fluid temperature. The transmission fluid temperature gauge defaults to 0°C (30°F) if:

• The ECM or the TCM detects a malfunction in the transmission fluid temperature sensor circuit.
• The BCM detects a loss of serial data communications with the ECM or the TCM.
• The auxiliary gauge module detects a loss of serial data communications with the BCM.