06 Ecm connections

Dont know if anyone has had this issue.



I am trying to connect to my brothers 06 Cummins.



I use the V2 to scan for codes and it powers up just fine but it when it checks for codes the it says : Error $0280 cannot connect to ECM



I try and scan with 7.5 when i select the correct ECM it tries to connect and then it switches to Generic/ autocal.



I am running the latest update and I bought the Cummins unlock even though I should be able to scan without it.



I have even tried to read the stock file and it keeps kicking out saying it cannot connect.



I dont have any problems scanning with my Snap-On Solus I can check codes and scan.



Thanks

Bob