2003 Code P0125 Coolant Temperature | Ford Thunderbird forum club group 1955-2005 models

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2003 Code P0125 Coolant Temperature

  • Thread starter Thread starter HNDOGOD
  • Start date Start date
The Thermostat Monitor is designed to verify proper thermostat operation. This monitor was phased in on certain applications beginning with the 2000 model year and replaces the original "Insufficient temperature for closed-loop test" (Diagnostic Trouble Code (DTC) P0125). This monitor is executed once per drive cycle and has a monitor run duration of 300-800 seconds. If a malfunction is indicated by the thermostat monitor a diagnostic trouble code P0125 will be set, and the malfunction indicator lamp will be illuminated.

If the thermostat is stuck open, you will not see any overheating with fault P0125.

doug7740
1955 Thunderbird Blue

P0125 2.jpg
 
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HNDOGOD said:
Got a error code P0125 yesterday with check engine light...
Not seeing any overheating or other issues...2002 Tbird
Any suggestions ?
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Get a BlueDriver OBDII reader, it will not only read the code, but also suggest a fix. Our 2004 Jeep did this when the theromostat got stuck open. Since the thermostat will not close, the coolant does not heat up as expected. Many people ignore this issue, however when I researched, it can lead to other problems so you definately want to fix it. A mechanic can verify the issue as well.



2002-2005 Thermostat-
Purchase Link- https://www.amazon.com/s?tag=thunderbirdforum-20
 
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On a car that's old if you have not flushed the coolant I would do this. The solved a similar issue on one of my other cars that is 12 years old
 
CBBIRD said:
On a car that's old if you have not flushed the coolant I would do this. The solved a similar issue on one of my other cars that is 12 years old
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Yes - thanks....the coolant system has been flushed recently while other work was performed...fan pump solenoid and heater valve....new t-stat last summer...so far the light has not come on again and the car is operating fine since I reset the engine light...Thanks...
 
CBBIRD said:
On a car that's old if you have not flushed the coolant I would do this. The solved a similar issue on one of my other cars that is 12 years old
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Yes, best to change green coolant every 2-3 years. The gold long life coolant is supposed to be a 5 year product but I come from the diesel engine parts business and the 2003-2007 Ford 6.0L had a lot of trouble with powdered deposits clogging the oil cooler which has small passageways. It's an additive that comes out of solution. The restricted coolant flow coming out of the cooler affected the EGR cooler which is downstream. The hot exhaust gas being transported back to the intake would not be cooled enough, so it would overheat the cooler, causing internal cracks and coolant coming into the intake. That causes a wet, sooty exhaust which gums up the variable vane turbine side of the turbo. Our cars are not set up like that but old coolant is likely laying down this deposit somewhere. Can't be good!
 
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