loss of communications, many things could cause this from a bad ground, to cut wire, to a bad chip in the computer ecm
code u1000 means no state of health from your module.. either your engines good and showing no worry codes.. or your modules duff.. the (d)stealer will soon set you right
Trouble code U1000 means: Class 2 Data Link Malfunction
Trouble code P0172 means:System too rich (Bank 1)
What the code U1000 on a 2004 Nissan murano
What does the error code U1000 mean on a 2004 Nissan murano
Trouble code P0442 means: EVAP System Small Leak (0.040") Detected
U1000 controller area network problem
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call your local Chevy dealership they will help you with codes
A U1000 code on a 2005 Chevy Colorado indicates a communication error between the vehicle's control modules, often related to the Controller Area Network (CAN) bus. This code suggests that there may be a problem with one of the modules or wiring, which can result in various electrical issues. Common causes include damaged wiring, poor connections, or a malfunctioning module. Diagnosing the issue usually requires checking the wiring and connections, as well as testing the involved modules.
change your o2 sensor
Maximum Adapt and Long Shift