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Old 02-09-2014, 01:57 PM
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Newby to Diesels have code p0128 today

Hello,
My first post and have a question needing answered please.

We just bought a 2008 F250 super duty 6.4 King Ranch and it just threw code p0128 code the truck is still running fine the temp gauge finally went up and heat was blowing but check engine light still on?

Auto zone says they see this a lot in the winter the coolant level is normal.

This is our first Diesel truck and don't know a whole lot about them?

Now the truck has 94,632 miles on it and I am going to have the 100k maint done this week will it be ok to continue to drive the truck and have them replace the thermostat then since they have to drain and flush the coolant anyways?

Thanks Matt
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Old 02-10-2014, 05:46 AM
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P0128 Code

Copied from Check engine light - false signal for broken thermostat - Diesel Forum - TheDieselStop.com

Ford Doctor posted:

Another emissions regulation requires the monitoring of engine temperature and the amount of time it takes the engine to reach full operating temperature. Over the winter months we had seen a lot of check engine light concerns with the DTC's P0128 & P0196 both of which are directly related to engine temperature and warm up. P0128 is for coolant and P0196 is for engine oil temperature which is also affected by cooling system concerns.

The last we heard what that Ford Engineering is investigating this concern so I would guess that a service bulletin or a Field Service Action will be issued in the future to address this problem.

Now, to explain this, if the cooling system has a problem, whether it be low coolant, a stuck or leaking thermostat or a problem with the ECT or EOT sensors one or both of these codes will set and the Check Engine light will illuminate. There have been some instances of faulty thermostats but not an epidemic. I personally pulled one out of a truck that was bent believe it or not. The real issue is in cold weather and cold geographic locations where trucks are started and allowed to sit idling. Never a good idea to idle your truck more than a few minutes anyway. In discussing this with other technicians and comparing freeze frame data, if the engine temperature does not reach 170 degrees-F in 10 minutes the code will set. The use of a block heater seems to aggravate this as well.

What the actual problem is and what the "fix" will be is anyone's guess. The parameters are not changeable so I imagine a combination of reduced cold idling and getting the engine warm up faster will be the challenge. It also doesn't help that that the cooling fan seems to be moving a lot of air when cold...
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Old 02-10-2014, 05:59 AM
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Welcome aboard Chief! Congrats on the truck!
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Old 02-10-2014, 06:14 AM
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