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
change your o2 sensor
Maximum Adapt and Long Shift
code p0302 is cylinder no.2 misfire detected