Question about 2003 Chevrolet Silverado 2500HD

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2003 Chevy 2500HD 8.1 Allison 4x4. Truck runs 100% fine. Each day when started MIL comes on codes P0700 and P1779 are present. I know what they stand for but have no idea how to fix. If codes are cleared and truck driven all day they will not come back, as soon as its turned off and restarted it comes back on. Any ideas?Tranny is not in limp mode or anything, truck runs great.

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I have the same exact truck as you do and had a similar problem awhile ago when i installed the hypertech system. I had to uninstall the hypertech and then have a buddy (cause i did not know how) drain the residual power from the brain... apparenlty the brain houses a small amount of power and remembers these codes so after you turn off your truck...poof there they are again. This worked for me, but then I had other electrical problems so I the dealership had to replace the brain.

Posted on Apr 08, 2010

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Posted on Jan 02, 2017

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