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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Self Diagnostics - 4.7L) >> Diagnostic Tests >> DTC P0128: Thermostat Rationality >> Monitored & Set Conditions

Monitored & Set Conditions

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

Thermostat Rationality is monitored with the engine running. The PCM predicts a coolant temperature value that it will compare to the actual coolant temperature. DTC will set if there is a significant difference in the two temperature values. This is a two trip fault.

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