P0128 code
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P0128 code
Hi Guys, I have gotten a P0128 Coolant Temp Below Thermostat Regulating Temp 4 times in the past two weeks...Coolant level is fine, 61,000 miles.
Any idea or known issues I can look for
Thanks for any input
Any idea or known issues I can look for
Thanks for any input
Fleet Mechanic
Joined: Dec 2016
Posts: 1,807
Likes: 539
From: Florida
From my search:
Looks like your stat may be stuck open and not allowing your truck to warm up enough. Either that or a bad sensor. Have you had any issues with insufficient heat in the cab lately?
A P0128 is a code is an indication of a faulty thermostat or ECT (engine coolant temp sensor). The manufacture designs the engine to run at a specific operating temperature for the most efficient operation. The thermostat regulates the coolant between the engine and radiator.
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Thanks for the reply, I have started to monitor engine temp gauge..heat ok
Just ordered Ford F1VY-8255-A - SEAL - THERMOSTAT, Ford 7L3Z-8575-D, Engine Coolant Thermostat.
Cannot find Engine Coolant Temp Sensor?????
Just ordered Ford F1VY-8255-A - SEAL - THERMOSTAT, Ford 7L3Z-8575-D, Engine Coolant Thermostat.
Cannot find Engine Coolant Temp Sensor?????
Fleet Mechanic
Joined: Dec 2016
Posts: 1,807
Likes: 539
From: Florida
Since your heat is good, it might just be that sensor. I'd hit the dealer's parts desk up for one. Good luck.
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