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My car hardly gets to the ideal temp (coolant temp) since new and the code p0128 (Coolant Temperature Below Thermostat Regulating Temperature) popped with a CEL recently. I took it to the dealer and they are blaming the grill shutters (or lack of) but I don't think so, as many of us have removed them and I haven't heard of someone with this trouble. Anyway, I had a mechanic check the thermostat and he says that it is working correctly, same with the coolant sensor. Does anyone have any idea of what can be causing this?
 

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I've had my shutters off all winter and it still warms up in 5 minutes even below freezing. So it's def not the shutters. I would get a second opinion on that thermostat and sensor.
 

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2017 Ford Fusion Sport
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I've had my shutters off all winter and it still warms up in 5 minutes even below freezing. So it's def not the shutters. I would get a second opinion on that thermostat and sensor.
When you say "warms up in 5 minutes" what temp are you referring to?
 
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