Question about 2004 GMC Envoy

1 Answer

2003 toyota corolla please help me with this code po125

I change THERMOSTAT AND ENGINE COOLANT TEMPERATURE SENSOR AND 02 HTR SENSOR AND 02 OXYGEN SENSOR AND SPARK PLUG AND LID FROM THE COOLANT AND REPLACE THE FUEL LID. I RESET THE CODE PO125 AND STILL CAME BACK THE SAME CODE PO125, I GIVE UP PLEASE HELP!.. THANK YOU AND GOD BLESS YOU ALL.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • GMC Master
  • 6,927 Answers

Did you bleed the coolant system?This needs to be done,and it should be fine,but you will have to have the code erased too.

Posted on Jul 06, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 06, 2010

    If this was at all helpful,please rate,and thank you.

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

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

2 Answers

All 4 O2 Sensors failed at the same time


Check the relays and fuses for the H.E.G.O (heated oxygen sensors) for power and function.

Nov 04, 2013 | 2004 Nissan Pathfinder

1 Answer

Check engine code P0125


PO125---- Insufficient Coolant Temperature for Closed Loop Fuel Control

No idea what car or engine you have

If you have a coolant temp sensor it could be bad

The thermostat also cool be stuck open

Both could be bad

Without the correct coolant temp (thermostat) or temp
sensor working, then your running the fuel injector timing
off Computer Controlled Open Loop-- meaning the oxygen
sensors are not in use as in closed loop & your wasting
gas ,as you have only a preset control over fuel trim eg:
no adjustment as you drive

I would install new spark plugs if over 3 years old -nothing
else,tune-ups are long gone 30 years ago,only the plugs left,
don't go done that road of being pitched something you don't need

I would new install front oxygen sensors,not the rear ones,
if over 100,000 miles
New thermostat & coolant temp sensor (CTS) if that
is what you have or other correction for that situtation.

Nov 14, 2012 | Cars & Trucks

1 Answer

Corolla, 1999, P0125


P0125 TOYOTA - Insufficient Coolant Temperature for Closed Loop Fuel Control

Possible causes- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection

Oct 14, 2012 | 2001 Toyota Corolla

1 Answer

Why the codes po125 & po135 &po155 keep coming back?


Hi there:

DTC P0125 - Insufficient Coolant Temperature For Closed Loop Fuel Control

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).


DTC P0135 - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
or
DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

A code P0135 and P0155 may mean that one or more of the following has happened:

  • O2 Heater element resistance is high
  • Internal short or open in the heater element
  • O2 heater circuit wiring high resistance
  • open or short to ground in the wiring harness

In order to solve just...
  • Repair short or open or high resistance in wiring harness or harness connectors
  • Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)


  • Hopoe this helps.

    Aug 28, 2012 | 1999 Toyota Sienna

    1 Answer

    '01 Sequoia throwing 2 OBD II codes: po125 & po135. replace pre-cat o2 sensor?


    DTC P0125 OBD-II - 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. You will likely not notice any drivability problems.

    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


    DTC P0135 OBD-II - Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
    This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135. You will likely notice poor fuel economy the illumination of the MIL.

    A code P0135 may mean that one or more of the following has happened:
    O2 Heater element resistance is high
    Internal short or open in the heater element
    O2 heater circuit wiring high resistance
    open or short to ground in the wiring harness


    For additional details, feel free to contact us in the preivous code link.

    Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

    Thank you for using Fixya, and have a nice day.

    Oct 12, 2011 | 2001 Toyota Sequoia

    1 Answer

    I have a1996 ford explore with this codes p0133:02,po155:02,p1115andpo0306


    DTC P0133 - Oxygen Sensor Circuit Slow Response (Bank1, Sensor1)
    This involves the front oxygen sensor on Bank 1. This code indicates the engine air fuel ratio is not being adjusted by the oxygen sensor signal or the ECM as expected to do so, or not adjusted as often as expected to do so once the engine is warmed or under normal engine use. You will likely not notice any drivability problems, although there may be symptoms.

    A code P0133 may mean that one or more of the following has happened:
    The oxygen sensor is faulty
    The wiring to the sensor is broken / frayed
    There is an exhaust leak


    DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
    This code refers to the front oxygen sensor on Bank 2. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0155. See also: P0135 (Bank 1). You will likely notice poor fuel economy the illumination of the MIL.

    A code P0155 may mean that one or more of the following has happened:
    O2 Heater element resistance is high
    Internal short or open in the heater element
    O2 heater circuit wiring high resistance
    open or short to ground in the wiring harness


    DTC P0306 - Cylinder #6 Misfire Detected
    A P0306 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #6. Symptoms may include the engine may be harder to start, the engine may stumble / stumble, and/or hesitate or other symptoms may also be present.

    A code P0306 may mean that one or more of the following has happened:
    Faulty spark plug or wire
    Faulty coil (pack)
    Faulty oxygen sensor(s)
    Faulty fuel injector
    Burned exhaust valve
    Faulty catalytic converter(s)
    Running out of fuel
    Poor compression
    Defective computer


    DTC P1115 - Intake Air Temperature 2 Circuit High Input (Super/Turbo Charged engines)


    In the next diagram could checl this specific location about each O2 sensor...

    zjlimited_7.jpeg


    Hope this helps.

    Oct 05, 2011 | 1996 Ford Explorer

    2 Answers

    How the ECT SENSOR WORKS


    The ECT (Engine Coolant Temperature) sensor is a thermal variable resistor (also known as a "thermistor"). The ECT delivers a signal to the THW terminal of the Engine Control Module (ECM) which varies with engine coolant temperature. The ECM uses this signal to control the fuel injection system, the overdrive operation on vehicles equipped with electronically controlled overdrive transmissions, spark timing control, idle speed control, fuel pressure control system (if equipped), heated oxygen sensor system (if equipped) and EGR systen (if equipped)

    Jun 03, 2011 | 1997 Toyota RAV4

    3 Answers

    Readings on my 2003 Toyota 4 cylinder ck engine soon is P0128, P0420, P0430.. what could it be. Should I change thermostat, 02 sensor or catalytic converter.. Please advise.


    PO128 = It is probably a bad ECT (engine coolant temp) sensor. PO420= The problem could be a bad cat, o2 sensor (Pre- and/or post cat)or o2 sensor wires, or an air fuel mixture problem that has caused the cat to fail.PO430= Catalyst System Efficiency Below Threshold (Bank 2) Your CAT converter is not cleaning properly. Hope this helps, James Booth

    May 17, 2011 | Toyota Highlander Cars & Trucks

    Not finding what you are looking for?
    2004 GMC Envoy Logo

    552 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top GMC Experts

    yadayada
    yadayada

    Level 3 Expert

    80417 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22326 Answers

    Ronny Bennett Sr.
    Ronny Bennett Sr.

    Level 3 Expert

    6927 Answers

    Are you a GMC Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides

    Loading...