Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.In order to determine what is causing this code to set you are going to need to do some testing, I have enclosed the test steps in the link below. Copy and paste the link to your browser to open and view it.https://dl.dropboxusercontent.com/u/104923897/U0073%20Jun%2030.pdf
It has been a zoo trying to get through to some one this morning. For some reason I kept being put into the new customer pool when I went to get an answer. and it took many hours for the first answer. Anyway
Ron, I already have the process data sheet you sent me above. I have gone through the process and rechecked. what I have found so far: I can communicate with all modules, I checked All DLC terminals values and all are normal. I went through the suggested procedure for testing high and low speed GMLAN. I cleared all codes, went through a drive cycle and the DTC U0073 comes up with warnings on IP.
Sorry for that, sometimes the site can be a little hard to navigate . Since there are no reported known causes for this issue your going to need to do the testing to determine the cause.