Before anyone says search forums I already have. I have clean sanded and reconnected every ground in my car. Whole story I swapped motors for a low mileage de. Full bolt ons. Had Osiris etune done. Well my idiot I.T. friend said it was installed and I drove the shizz out of it for a month and started throwing p1111 codes and misfire on cylinder 5. Replaced proper O2 sensor and checked injector plug and swapped coil on cylinder 5. Car would run fine at cold start but once warm went straight into limp mode. When to clear codes through uprev and realized he didn't give Osiris admin ability so tune was never loaded. I proceeded to actually put the tune in and threw the u1000 code immediately after that. Help plz guys

 

U1000 is a CAN communication error, The ECU is not communicating with other modules like AC AMP, IPDM, BCM ... etc

Could be bad wiring, blown fuse, short to ground ...

 

Redid all grounds checked all fuses and wiring is good I am stumped