u 1001 code for gmc envoy

Question

WHEN A DIAGNOSTICS WAS RAN, THE CODE CLASS 2 U1001 CAME UP

Answer 1

U1001 Invalid or missing data for primary ID

When you set this code it should be set with a 3 digit ID number , this would not set by for example  U1001  016 or U1001 026, the 3 digit number is neede to pin point the exact cause for this code condtion