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Posts Tagged: Jeep P0128

Jeep P0128

Diagnose and fix Jeep P0128 You may find a Jeep P0128 –P0128-THERMOSTAT RATIONALITY trouble code on your Jeep, Dodge or Chrysler product. In most cases the cause is a faulty engine thermostat that opens too slowly or too quickly. To determine when to set the Jeep P0128 trouble code, the PCM tries to predict what engine coolant temperature should be based on the engine temperature and ambient temperature at cold start-up. Then the PCM compares the predicted temperature to the actual temperature from the engine coolant temperature sensor (ECT). For … Read More


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