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My 1998 pontiac firebird service engine light came on and my OBD11 scanner produced 2 trouble codes PO125 ( insufficient coolant temperature for closed loop fuel control.the 3800V6 engine over heating and heater produces cold air only.l replaced the themostat and the(ECT)engine coolant temperature sensor but service engine light still on and scanner trouble code PO125 still on.What else would cause these engine over heating problems and heater not producing hot air, triggering a PO125 code insufficient coolant temperature for closed loop fuel control OBD11 trouble code and service engine soon light?

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  • Cars & Trucks Master
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Service the engine.. change oil ,filter plugs etc

did you clear the faults before each read
Diagnose Buick 3800 Engine
unusual code that

P0125 is the OBD-II generic code for the engine computer, or Engine Control Module (ECM), not detecting enough heat in the cooling system before the fuel management system can take control. The ECM has a predetermined value after you start your vehicle to expect a certain coolant temperature

P0125 OBD II Trouble Code Insufficient Coolant Temperature for Closed Loop...

ecm runs the engine cooling fans

3800V6 engine over heating and heater produces cold air
try these

EGR vale not working
overheating
inlet manifold gasket leaking
water pump fins corroded
soft radiator hoses
try a new radiator cap

internal heating
heater control tap stuck
directional actuator flaps stuck

Posted on Apr 16, 2017

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Posted on Jan 02, 2017

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noranda21
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SOURCE: insufficient coolant temperature for closed

A code P0125 may mean that one or more of the following has happened:

The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level) theres your answer need more help just tell me

Posted on Dec 03, 2010

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PO125 megane


"OBD Code P0125 refers to: This means that the engine coolant temperature (ECT) sensor indicates that the engine has not reached the required temperature level to enter closed-loop operation within a specified amount of time after starting the engine."
renault P0125 OBD DLC Error Code Insufficient Coolant Temperature for...

Mar 14, 2015 | Renault Megane Cars & Trucks

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How to replace a ect sensor on a 02 5.4 v8 triton


I hope you realize that the po125 DTC code does not necessarily mean that you have a problem with the cylinder head temperature [CHT] sensor or the Engine Coolant Temperature [ECT] sensor.

It only means that the coolant temperature is too low for closed loop operation.

Other issues that may trip a DTC po125,
  • Insufficient warm up time
  • Low engine coolant level
  • Leaking or stuck open thermostat
I would clear the code and see if it comes back- since you won't experience any difference in engine operation anyway.

You'll need to perform a continuity test on the sensor, when the engine is cool and then again after warming up the engine.

Then you'll want to take voltage readings on the wire harness that goes from the ECT back to the GEM.
You may find that the wire harness from the sensor to the GEM may be shorting out.

However, I would think that, if anything, the thermostat would be the culprit and malfunction before a faulty sensor.

You'll find the sensor under the upper radiator hose where the thermostat housing is mounted on the engine block. It may be obscured by the alternator.

And if you don't mind my 2 cents worth of friendly advice, either purchase a Chilton or Haynes repair manual from your local auto parts store or online.

Good luck on your project.

Dec 08, 2013 | Ford F-150 Cars & Trucks

1 Answer

Code po125


code po125 refers to insufficient coolant temperature for closed loop fuel control causes ---wiring--cooling system---coolant thermostat--ECT sensor ---ECM. Check the level in the radiator. take it to a specialist mechanic for your car

May 25, 2013 | 2001 Ford Focus

1 Answer

I HAVE A PO125 AND PO650 FAILURE CODE


P0125 - Insufficient Coolant Temperature for Closed Loop Fuel Control Possible causes - Harness or connectors (The sensor circuit is open or shorted.)
- Engine coolant temperature sensor may be faulty
- Thermostat may be fault (most common cause)

P0650 - Malfunction Indicator Lamp Control Circuit Malfunction (Check Engine light)

Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
Possible causes - Harness or connectors for the MIL (Check Engine Light) circuit is open or shorted
- MIL bulb may be faulty
- Faulty ECM

Mar 02, 2011 | 2000 Oldsmobile Alero

1 Answer

PO125 how to fix code


DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control

This means that the engine coolant temperature (ECT) sensor indicates that the engine has not reached the required temperature level to enter closed-loop operation within a specified amount of time after starting the engine.

Symptoms: You will likely not notice any drivability problems.

Causes: A code P0125 may mean that one or more of the following has happened:
* Insufficient warm up time
* Low engine coolant level
* Leaking or stuck open thermostat
* Faulty coolant temperature sensor

Possible Solutions: The simplest thing to do is to reset the code and see if it comes back.

If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level).

Hope this helps (remember to rate this answer).

Feb 02, 2011 | Ford Explorer Sport Cars & Trucks

2 Answers

Insufficient coolant temperature for closed loop fuel control, how to fix problem? It's code po125


A code P0125 may mean that one or more of the following has happened:
The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is likely going to be the result of the above causes (faulty thermostat, faulty ECT sensor, or a low coolant level) theres your answer need more help just tell me

Dec 03, 2010 | 2000 Ford Expedition

1 Answer

I have check engine light code po125---p1139 toyota 4runner v6


PO125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP CONDITIONS.POSSIBLE CAUSES - LOW COOLANT LEVEL - STUCK OPEN THERMOSTAT OR FAULTY ENGINE COOLANT TEMPERATURE SENSOR. DID NOT SEE CODE P1139.

Apr 25, 2010 | 1999 Toyota 4Runner

3 Answers

Getting a PO125 code in my 98 Camry (4cyl), already replaced the Spark plug wires and fuel filter, any ideas?


P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
Replace your coolant temp sensor.Be sure to double check your coolant level and does the engine reach an operating temp(about halfway on the guage)in a normal time?! If it does, the temp sensor for the computer needs to be replaced.

Apr 16, 2010 | 1998 Toyota Camry

1 Answer

Check engine went on, code came out as po125


Insufficient coolant temperature. Probably a bad thermostat, unless you are experiencing near zero temperatures in your town. If that's the case, chances are the light will go out when the weather warms up.

Feb 18, 2010 | 1999 GMC Sonoma

3 Answers

Shows trouble code PO125 coolant temp. to low. replaced thermostat.no change still shows same code after driving 35 miles.


I would have the OBD II scanner clear the codes. Then if the code still pops up, I would have the coolant temperature sensor looked at.

Oct 07, 2009 | 2002 Mercury Mountaineer

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