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U1000

The code is for lost communication with the ECM's data lines. Try to loosen and retighten the ECM connector ground and the battery negative cable ground to the body. Clean and check both these connections and clear codes and see...

The code you are getting is a lack of communication from or to the body control module. The problem has been fixed by other owners by replacing the ignition switch (https://www.yourmechanic.com/services/ignition-switch-replacement) on some vehicles and had to replace the body...