Would a loose grounding strap cause codes to go a flying?

[Braciole]

Im getting codes
[ECM] P0606 - Control Module Internal Performance (SES) (History) (Immature)
[ECM] U0121 - Lost Communication With ABS Control Module (History) (Immature)
[ECM] P0606 - Control Module Internal Performance


Continuous Tests
Misfire: Complete
Fuel System: Complete
Comprehensive Component: Complete


Once Per Trip Tests
Catalyst: Complete
Heated Catalyst: n/a
Evaporative System: Incomplete
Secondary Air System: n/a
A/C System Refrigerant: n/a
Oxygen Sensor: Complete
Oxygen Sensor Heater: Complete
EGR System: n/a
I have a new motor installed, can this be caused by a bad or broken ground strap?

[PGA2B]

I can tell you from experience that a bad or loose ground can cause all kinds of wierd problems. I was in Car Audio and Security for 13 years and saw my fair share of weird ground issues. I have also seen corroded grounds under the strap play havoc too.

Check all your grounds make sure they are all tight and clean.

[Braciole]

Thanks. The negative terminal was loose I tightened that now I checking ground straps