Question about 2007 Chevrolet Equinox

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My chevy equinox is sending a code p0128

My car originally sent a message that said Engine hot/ a/c off. I got out of car and the fan was running at full speed. I hooked up a scan tool. It said motor was 165, therefore, not hot. I went to alldata. It told me to remove the pcm and ect connector and place dielectric grease in the area. I did this. Now the car will not start. I checked all fuses....none are bad. I have lights, radio, blower fan, window power, etc. It is now saying service engine soon. Service stabilitrak, service traction control. Any answers?//Think it might be the pcm, but without assess to GM website, I can't be sure.

Posted by michblueeyes on

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Thomas Perkins

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  • Chevrolet Master
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Click on link to see code.

Posted on Feb 08, 2013

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5 Related Answers

Anonymous

  • 45 Answers

SOURCE: Chevy Trailblazer Engine very loud when starting

it's too early to tell. i,ve never known a light to come on because of a thermostat.you need to see what code was stored. without knowing,im just guessing. but my first thought was a plugged up catalytic converter. that explains the low power,also fuel filter.

Posted on Apr 29, 2009

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motor1258

Mike Butler

  • 6674 Answers

SOURCE: P0128 Code for a 2004 trailblazer with service engine soon light

Replacing it is the only fix. Sounds like it may be sticking open slightly.

Posted on May 27, 2009

Anonymous

  • 35 Answers

SOURCE: Service Stabilitrak-Reduced Engine Power

the engine light is a generic fault indicator in your car to point out something is not quite right with the engine, having a loss of power as well is also known in some areas as Limp Mode or Safety Mode. it means the car is restricting the power it gives to ensure no damage it done to the engine.

the only certain way to find out what is wrong is to take it to a garage that has diagnostics equipment that can read the fault codes from the vechicles ECU (the fault codes will be the reason the light on the dash has come on as its reporting a fault somewhere)..

your mechanic should be able to tell you what is wrong with the engine from that and give you a more accurate cost at fixing it.

Posted on Dec 29, 2009

SOURCE: reduced engine power on

The traction control uses the speed sensor in the transmission and the wheel speed sensors to determine wheel spin. If a wheel spins braking is applied to it so that the power can be transferred to the other wheels. At some point the ECU detected a gross disagreement between the sensors and so as a precaution has entered into a limp home mode. On some systems if the fault is in error it can be cleared by putting the car into drive and moving forward a meter, putting in reverse and going a back a meter and doing this three times. If one or other of the sensors are faulty this process will not allow the error to be cleared. You need to check or have checked the error codes and the speed sensors.

Posted on May 28, 2010

Anonymous

  • 1 Answer

SOURCE: On my 2007 Chevy Equinox

i have chevy equinox 2007 LT with AWD system, my problem is that i have two messages appearing in the DIC : satbilitrack and service tracktion control. can u help me with this and tell me whats the problem and how should i fix it?

Posted on Apr 13, 2011

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Cooling fans not coming on in 2007 chevy equinox

The cooling fans are computer controlled, the engine temperature at which they are turned on is about 225-230F, the signal comes from the ECT sensor. The fans are controlled through a relay in the underhood fuse and relay power distribution box, the location of the fan relay is shown on a sticker on the bottom of the lid over the power distribution box. The fan system is tested by the computer when you run a fault code test with a code reader or a scanner. Do this and see if a fault code comes up. DO NOT OVERHEAT THIS ENGINE OR YOU WILL DO SERIOUS DAMAGE TO THE CYLINDER HEAD GASKETS RESULTING IN A HUGELY BIG REPAIR BILL. Get this repaired ASAP.
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P0128 came back after replacing t-stat

code p 128 refers to coolant thermostat---coolant temp below thermostat regulating temperature ====causes --mechanical fault
you say that you have replaced the thermostat and it is just under 210 F which is 99 c or almost boiling point
you will have to investigate why it is running so hot.
check that you put the thermostat in correctly ( bulb section to block/head water
Next point --the codes are originated by the coolant temperature sensor ( puts the fans on and sets the ECM fuel/air ratio for the engine ) so to get it off you will need to reset with a scan tool
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CEL on with PO128 code. Recently replaced radiator and thermostat. No engine cooling issues, had a leaking rad. Checked coolant flow; hot and cold, normal. Was going to replace ECT sensor, but want to...

A code P0128 may mean that one or more of the following has happened:
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty ECT Sensor
  • Faulty intake air temperature (IAT) sensor
Possible Solutions Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat
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2003 chevy cavalier with no heat and temperature doesn't rise past 40 degrees engine code P0128 comes up when checked and the thermostat and radiator have been replaced still isn't fixed what do i do?

A code P0128 may mean that one or more of the following has happened:
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature (ECT) sensor
  • Faulty intake air temperature (IAT) sensor
Possible Solutions
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I have a 2004 Chevy Impala. As I was driving home yesterday I had the heater on full blast - temp outside appx. 60. The check engine light came on and I had a P0128 code. Could this be due to keeping...

This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.


A code P0128 may mean that one or more of the following has happened:

  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature (ECT) sensor
  • Faulty intake air temperature (IAT) sensor

Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:

  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat


REFERENCE: http://www.obd-codes.com/p0128


I hope this helps a bit!

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I have a 05 chevy trailblazer, the check engine lite is on and a hand held analyzer indicated problem codes: PO410 $ PO128 any ideas? Wayne C

P0410

Definition
Secondary Air Injection System fault
Explanation
The air injection system is monitored for faults
Probable Causes
1) Circuit relay defective or fuse open
2) Check connector and wiring
3) AIR pump defective or hoses blocked


P0128
Fault Code Definition
  • Engine temperature has not increased and/or reached the correct level within a specified amount of time after engine startup
Common Problems That Trigger the P0128 Code
As for the po128 I would replace the thermostat first. That is the problem 99% of the time.

Good Luck
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2006 pont grand prix when car gets warm it starts misfiring i will scan it code po300 comes up and code po 128

P0300 is a code for multiple misfire. Which could be created to the P0128
P0128 PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat.
A code P0128 may mean that one or more of the following has happened:
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature (ECT) sensor
  • Faulty intake air temperature (IAT) sensor
Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat
Good luck and hope this helps. keep me posted, be glad to know your car is running 100% again soon.
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