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I have a 2003 Dodge Dakota, 3.9, auto, 2wd. The check engine light is on and when I scan it it says I have a “check sum error.”

I have a 2003 Dodge Dakota, 3.9, auto, 2wd. The check engine light is on and when I scan it it says I have a “check sum error.” The light will not stay off after resetting. Just what the heck is a check sum error and what does it have to do with my truck?

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The check sum error code is loss of connection in the PCM. This is most likely an internal circuitry problem, which may ultimately require replacement and re-flash of the PCM. You might want to have this troubleshot at the dealer level before swapping in a new or used PCM, but it sounds as if you are headed that direction.

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Tom Dayton
JS Auto Supply

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