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I found this page on Google looking for some help with my truck I just put the transmission in and a code showed up u1000 and it's also not reading park the truck turns over in nutral but will not stay running and it's back firing will not even turn over in park any ideas?
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take it back to the shop that put the trans in. who scanned the code..that's a manufacturer specific someone has a high end scanner but can't tell you what it means?

Possible cause:
Controller Area Network (CAN) communication harness is open or shorted
Faulty Engine Control Module (ECM)
Poor harness ground connection.

If your truck is a 2004-06, there's a TSB on the issue.

IN any event, this is not a diy fix.
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