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Diagnosis And Testing - On-Board Diagnostics

WARNING: This page is about a different car, the 2014 RAM 1500. 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 Powertrain Control Module (PCM) - Electrical Diagnostics 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 DIAGNOSIS AND TESTING  for other probable causes.

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