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2021
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Cherokee Trailhawk
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Repair and Diagnosis
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Engine Performance
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System
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3.2L - DTCS P0073 To P0298
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DTC Troubleshooting
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P0128-Thermostat Rationality
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Set Condition
Set Condition
The predicted coolant temperature reaches the target threshold before the actual coolant temperature and the PCM detects that the actual engine coolant temperature is too far below the what is acceptable for a good thermostat.