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Discussion Starter #1
I have replaced engine harness, ecm tcm harness, ecm, ficm, tcm, fpr, and a couple other sensors. Checked all the grounds
Here is a video of the truck acting up later after I parked the truck it ran fine.


Every search on the u1800 code comes up with the truck crank no start that I found.
Any help pointing me in the right direction will be greatly appreciated.


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