Rick's Free Auto Repair Advice

P0128 Coolant Thermostat

P0128 OBDII DTC code is defined as

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

This can be caused by
Low engine coolant level
Leaking or stuck open thermostat
Faulty cooling fan (running too much)
Faulty coolant temperature (ECT) sensor
Faulty intake air temperature (IAT) sensor

 

© 2012 Rick Muscoplat

Posted on by Rick Muscoplat


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