Engine light on my 2018 Camaro stays on
 

The engine light on my 2018 Camaro SS2, 6.2 litre is staying on. I have replaced the original exhaust with a 3 inch twin stainless steel system and sealed and welded all joins as we found, had to be done, as this could cause the light to stay on but it is still on. I have just had it in for its first service and it was put onto the computer etc and cleared and it comes back and shows that it is either exhaust and/or fuel pump fault/problem. The light has only come on since the new exhaust system has been installed. Could someone please help or advise what my next move should be.