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Diagnosis And Testing - On-Board Diagnostics

WARNING: This page is about a different car, the 2017 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 Diagnosis & 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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