I have a 2003 G35 6MT that I have been trying to fix recently and it’s been a pain in the a**. Originally the car was running rough due to it needing new cam sensors and a new crank sensor. 4 days ago I was driving and it felt different in the way it usually drives (acceleration was slightly slower). Another issue it was having is that it would grind going into 3rd gear. But I was on my way home and the car was running poorly. I managed to make it to my driveway and it died at the bottom of my driveway. I tried turning it on so I could move it up to the top but it would crank and not start. After the 3rd time of trying to get it started, it would just click and not start. I later pulled my car to the top of my driveway and replaced the crankshaft and cam sensors that I got from the junk but they are in good condition. The car would still not crank it start, it would just do 1 single click when I tried turning it on. I put my OBD2 scanner on it and I have the U1000 code which is my CAN communication not receiving signal from one of my modules and a C1136 code for Engine signal 6. I cleaned and tightened my grounds, checked my ECM relay, ABS module, re tightened negative battery cable, checked battery for voltage and tapped starter with metal rod and still nothing. I talked to an infiniti specialist and he said get a scan from a CAN Scanner called consult 3 but that’s WAY out of my budget. On the OBD2, i get 2 codes under ABS section which are the U1000 and C1136 and 1 code under BCM which the U1000 code also shows up again. RADIATIOR FAN TURNS ON WHEN IGNITION SWITCH IS TURNED TO ON. Any help would be MUCH appreciated because I have ran out of ideas:/

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check for water underneath the battery tray - sometimes it builds up there and messes up the wires and computers