Engine Thermostat Testing
ON-BOARD DIAGNOSTICSAll gasoline powered models are equipped with On-Board Diagnostics for certain cooling system components. Refer to On-Board Diagnostics (OBD) for additional information. If the Powertrain Control Module (PCM) detects low engine coolant temperature, it will record a Diagnostic Trouble Code (DTC) in the PCM memory. Do not change a thermostat for lack of heat as indicated by the instrument panel gauge or by poor heater performance unless a DTC is present. For other DTC numbers, refer to On-Board Diagnostics in Powertrain Management.
The DTC can also be accessed through the DRB scan tool.