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Help with troubleshooting P0125 code
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dmac0923
Enthusiast
Sep 9, 2011, 12:59 PM
Post #1 of 10
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Help with troubleshooting P0125 code
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Im trying to pinpoint the cause of the P0125 Code on my 2002 Ford Ranger 4.0l V6 Auto 4wd.
Ive had this code pop up 2x in the last year. Ive cleared it and it says off for about 6 months.
P0125 is- Insufficient Coolant Temperature For Closed Loop Fuel Control
Possible causes: - Insufficient warm up time
- Low engine coolant
 level - Leaking or stuck open thermostat
- Faulty coolant temperature sensor
Both times it has happed on a 28 mile highway drive to work, so i know there is sufficient warm up time.
the coolant level is full in the radiator neck and in the overflow bottle. Thermostat seems to be working as it should opening at normal operating temp.
Tell me if i am wrong but if the ECT was bad that would cause a hard fault and constantly turn the CEL on no??!?
The one thing i happened to stumble upon actually by accident. I was checking the fluids in my truck (engine is cold) and noticed the radiator fan is running on high. I always assumed that with a clutch style fan it only came on when the temp sender signaled it to.......But with a cold engine why would the fan come on?
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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dmac0923
Enthusiast
Sep 9, 2011, 1:06 PM
Post #2 of 10
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Re: Help with troubleshooting P0125 code
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I forgot to mention in regard to the fan,
When i stop the engine the fan spins freely so the clutch is not locked in the on position.
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 9, 2011, 3:05 PM
Post #3 of 10
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Re: Help with troubleshooting P0125 code
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That means that the engine isn't getting quite hot enough to satisfy the computer. A new thermostat will usually resolve it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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dmac0923
Enthusiast
Sep 12, 2011, 1:32 PM
Post #4 of 10
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Re: Help with troubleshooting P0125 code
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well i noticed a little puddle of coolant under the car after the car sits for a while. Doesnt leave the puddle when the engine is hot so im guessing i have a small crack in the radiator side tank that weeps when cold.
So since im looking at a new radiator, ill through in new hoses and thermostat...
but any ideas why the radiator fan is coming on during a cold start up?
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 12, 2011, 2:02 PM
Post #5 of 10
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Re: Help with troubleshooting P0125 code
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You would have to use a scan tool to find out why. It's either seeing A/C request or has open circuit on the CTS unless of course someone has done some creative wiring because they didn't know how to fix it right.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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dmac0923
Enthusiast
Sep 12, 2011, 4:32 PM
Post #6 of 10
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Re: Help with troubleshooting P0125 code
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thanks for the help, just looked up the ETS/CTS and they arent too expensive so maybe ill just through it in since that is one of the suspects for the DTC anyways
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 12, 2011, 4:35 PM
Post #7 of 10
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Re: Help with troubleshooting P0125 code
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I would be real surprised if it's an open CTS without setting a code. I would highly suspect modified wiring.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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dmac0923
Enthusiast
Sep 14, 2011, 12:07 PM
Post #8 of 10
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Re: Help with troubleshooting P0125 code
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Well after digging around i learned that my fan clutch is not electric.
Its a thermostatic viscous unit with the bi-metallic strip set up.
so why would that style engage at start up and stay on but unlock when the engine is off so the fan spins freely?
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2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Hammer Time
Ultimate Carjunky
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Sep 14, 2011, 12:43 PM
Post #9 of 10
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Re: Help with troubleshooting P0125 code
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I don't know but most of them do that. Might have something to do with centrifical force.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
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Sep 14, 2011, 4:20 PM
Post #10 of 10
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Re: Help with troubleshooting P0125 code
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I think they call it morning sickness.
Sometimes it depends on the position of the clutch when you shut the engine off. Silicone fluid in the reservoir leaks into the working chamber causing morning sickness until the wipers remove the fluid from the grooves in the working chamber inside the clutch housing. Other times if the clutch was engaged when you shut the engine off you'll experience it too. It's normal for a clutch to have morning sickness. If it never disengages while your driving, that is when you have a problem.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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