P0128 code

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01-02-2017, 07:09 PM

tbar1963

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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

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01-03-2017, 12:05 AM

kry226

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From my search:

Quote:

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.

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?

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01-03-2017, 06:02 AM

tbar1963

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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?????

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01-03-2017, 02:01 PM

kry226

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Quote:

Originally Posted by tbar1963

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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01-03-2017, 03:18 PM

tbar1963

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Quote:

Originally Posted by kry226

Since your heat is good, it might just be that sensor. I'd hit the dealer's parts desk up for one. Good luck.

Thanks..keep you updated

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04-01-2017, 10:49 AM

tbar1963

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Update..changed the thermostat and coolant on 1-11-17. No codes since, wanted to wait a month or so to be sure. Previous codes were very intermittent. Thanks guys

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