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2023
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ProMaster 2500
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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3.6L - DTCS P0057 To P0133
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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.