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Diagnosis And Testing - On-Board Diagnostics

WARNING: This page is about a different car, the 2016 RAM 3500 HD and 2016 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

All models are equipped with On-Board Diagnostics for certain cooling system components. Refer to the appropriate Diagnostic & Testing article . 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. Refer to DTC INDEX - 2500 HD & 3500 HD for other probable causes.

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