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The code P1389 can set if the Auto shut down relay has failed or one of the fuses to it is blown. Start first with checking the fuses 18 and fuse 20 and fuse 23 all located in the under hood fuse panel. If the fuse check okay make sure you have power to the relay at red wire as well as the red/lite green wire and the dark green/orange at the relay and if so, try swapping the relay out with a know good relay. See the wiring diagram in the link below for reference. Post back if you have more questions and or need more help and we can work from there if need be.https://dl.dropboxusercontent.com/u/104923897/Shut%20down%20relay%20Sept%2019.pdf