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    P0128 prolly a bad therm

    This is a discussion on P0128 prolly a bad therm within the Dodge Dart 2.4L Tigershark forums, part of the Dodge Dart Garage - The Mopar Zone category; The FSM does not specify how long it should take to get to operating temps. Obviously, if the outside temps are really cold, it should ...

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    Thread: P0128 prolly a bad therm

    1. #11
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      The FSM does not specify how long it should take to get to operating temps. Obviously, if the outside temps are really cold, it should take longer. These variables are built into the PCM programming.

      Set Conditions:

      •The predicted coolant temperature reaches the target threshold before the actual coolant temperature and the PCM detects that the actual engine coolant temperature is too far below the what is acceptable for a good thermostat.

      You can check if the TSB applies to your PCM model year. A dealer won't flash a PCM if a TSB doesn't apply. Replacing the coolant sensor is almost the same procedure as replacing the thermostat. The sensor is right there on the thermostat housing.
      The sensor is #2 in this pic:

      Name:  dart24thermostat2.jpg
Views: 95
Size:  33.3 KB
      -Case

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    2. #12
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      If I replace the thermostat, should I do sensor while I am at it. Is replacing the termo as hard as it looks or easy once you get in there?

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      That does the TSB do if applicable

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      Quote Originally Posted by alpinegreenneon View Post
      The FSM does not specify how long it should take to get to operating temps. Obviously, if the outside temps are really cold, it should take longer. These variables are built into the PCM programming.

      Set Conditions:

      •The predicted coolant temperature reaches the target threshold before the actual coolant temperature and the PCM detects that the actual engine coolant temperature is too far below the what is acceptable for a good thermostat.

      You can check if the TSB applies to your PCM model year. A dealer won't flash a PCM if a TSB doesn't apply. Replacing the coolant sensor is almost the same procedure as replacing the thermostat. The sensor is right there on the thermostat housing.
      The sensor is #2 in this pic:

      Name:  dart24thermostat2.jpg
Views: 95
Size:  33.3 KB
      Lastly, last Thursday (2 driving days before cel) I went to the dealer to get coolant, and the tech bleed pressure and then added coolant for me cause I was a little below add. Could this have anything to do with it? Or coincidence?

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    6. #15
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      Coincidence. If the reservoir was empty, that could cause problems.
      -Case

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      Quote Originally Posted by alpinegreenneon View Post
      Coincidence. If the reservoir was empty, that could cause problems.
      Wasn't empty but it was low, now it's at the full mark

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      Quote Originally Posted by alpinegreenneon View Post
      Coincidence. If the reservoir was empty, that could cause problems.
      Should I do both term and sensor?

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    9. #18
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      Since you are not certain, you might as well replace both since you will be right there with everything apart to get access.
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      Quote Originally Posted by alpinegreenneon View Post
      Since you are not certain, you might as well replace both since you will be right there with everything apart to get access.
      Comes with a sensor, that solves that.

      Does the vacuum pump have to come out, and if so what gasket/sealer do I use?

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    11. #20
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      No, it does not.

      It would be significantly easier to do since you can see it if you remove the pump but it doesn't if you don't want to.

      I'm also used to sticking my hands in blind walls feeling for low voltage wiring so there ya go...while also grazing high voltage which hasn't always been pain free.
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