Engine HOT - A/C off on 2006 STS-V - Page 5
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Cadillac STS-V Series Forum Discussion, Engine HOT - A/C off on 2006 STS-V in Cadillac V-Series Forums; DTC P0128 Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature The engine coolant temperature (ECT) sensor is a variable resistor that ...
  1. #61
    theotherguyssn's Avatar
    theotherguyssn is offline Cadillac Owners Fanatic
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    Re: Engine HOT - A/C off on 2006 STS-V

    DTC P0128
    Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature
    The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 volts to the ECT sensor signal circuit and supplies a ground to the low reference circuit.

    The purpose of this diagnostic is to analyze the performance of the thermostat, by using the ECT sensor to determine if the engine coolant will increase at the correct rate, and also meet the calibrated target temperatures under various operating conditions.

    The ECM uses the start-up ECT and the start-up intake air temperature (IAT) to begin the diagnostic calculation. The air flow into the engine is accumulated , and vehicle speed, distance, and engine run time are also factored in to determine if the ECT does increase normally and reach the calibrated target temperatures.
    straight from service info for gm if that helps you out any

  2. #62
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Engine HOT - A/C off on 2006 STS-V

    Ok cool thanks for that. My last question then is how do you "set the code to no report?" Is this a function on the obd II scanner?

  3. #63
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Engine HOT - A/C off on 2006 STS-V

    You need HPtuners for that.
    Guy.Seminerio likes this.

  4. #64
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Engine HOT - A/C off on 2006 STS-V

    Thanks a lot

  5. #65
    PGA2B's Avatar
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    Re: Engine HOT - A/C off on 2006 STS-V

    Quote Originally Posted by TimmyC View Post
    You need HPtuners for that.
    Or EFI Live.

  6. #66
    Guy.Seminerio is offline Cadillac Owners Connoisseur
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    Re: Engine HOT - A/C off on 2006 STS-V

    Gotcha

  7. #67
    Ninja-v is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    I just bought a 160 degree stat for an ls1 by mr gasket. I have hp tune pro. What do I need to adjust to reap the benefits?

  8. #68
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Engine HOT - A/C off on 2006 STS-V

    Just turn off that p0128 code.

  9. #69
    Ninja-v is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    Where do you find that at?

  10. #70
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Engine HOT - A/C off on 2006 STS-V

    engine diag dtcs

  11. #71
    Fierofiend is offline Cadillac Owners Fanatic
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    Re: Engine HOT - A/C off on 2006 STS-V

    You might also want to modify your fan speed tables.

  12. #72
    Ninja-v is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    That's what I was thinking too. And the part of the tune that deals with those temps

  13. #73
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: Engine HOT - A/C off on 2006 STS-V

    The lowest temp that the fans will turn on is 192F so your engine is not going to run cooler than that in the summer. I have the stock 176F thermostat in my car and it runs at 195-205 in the summer. That is already 20 degrees hotter than the thermostat opens. The thermostat sets the lowest temp that the car will run. The fans set the highest. You need an aftermarket method to turn the fans on for it to maintain less than 192 degrees.
    YoungBlood_STSV likes this.

  14. #74
    chekasout is offline Cadillac Owners Member
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    Re: Engine HOT - A/C off on 2006 STS-V

    once again, this forum saves the day!!!i was flippin with the ac off mssg. i was running 174 oil temp, and had the heat on full blast to dissipate the heat because i thought that was a high temp. i thought thermostat, first thing. thanks for the mind-calming post!!!!!

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