I have several ECU boxes that I was testing on my car to make sure they work as I want to sell some of them. They all work properly except for one. It is a Mopar Performance chrome box and when I plug it in to my car the engine won't fire. Can ECUs be repaired? If it was a plain ECU I would just toss it but being it is a MP chrome box I'd like to repair it if that is even possible.