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03 P2509 Code

jlwelding
jlwelding
in 3rd Generation Dodge

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My sons truck is having fuel mileage problems. One day it's getting 20 mpg the next its 14mpg with black smoke. Code is P2509 truck is 3/4 ton auto trans, bullydog program I think.

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I would unplug the box and see what it does then.

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So just check conections?

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I just talked with him and he knows they came on the truck 3 years ago. Getting load tested and hope thats all it is.Thanks for your help

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