Started car up this morning and the temp gauge wasnt registering then all of a sudden it shot up into the red, i took it to the garage and was told it was 1 of 3 faulty senser, a friend of mine did a diagnostic an got error codes P0115 Coolant temp signal and U2139 Can-Bus no comunicationwith engine control module, he says that its a wireing fault with which he says its a faulty ECU, could anyone tell me if the sensors could be the cause or do i need another ECU????,,,