Josh, Code 55 for your Altima simply means no faults were found/no malfunction. Do you mean car would not crank(engine not turning over) or did you mean engine will crank, but not start. I will post troubleshooting links to both conditions below. If not comfortable, have a good Technician look at it, diagnose and estimate repair.
Why Your Altima or Sentra Won Start How to Fix it
How to Troubleshoot No Start Nissan 2 4L 2 5L
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1215302
Why car won start troubleshooting tips
SOURCE: 98 f150 4.2 110.000 miles went to start up engine started clacking and smoking out exhaust
the intakes go bad on these engines....... they leak coolant in the cylinders and cause a hydro lock that causes the rods to bend making the piston skirt hit the crank......" clicking noise" theres a law suit in progress for this issue......... you can find info on the internet
SOURCE: 1997 Jeep Grand Cherokee cranks but won't start
Same thing happened to me at about 140k. It was the fuel pump. Best way to test if your pump is failing and loosing pressure is to see if the car will start immediately after it has been running, or turn the key to the alt position for a few minutes before starting. If your engine fires faster after it has been running or the key has been in the alt position you will probably need a new fuel pump. Great news is with a very deep socket to get the tank straps off its a 30 minute job to replace the pump/filter assembly.
SOURCE: 1993 altima will crank but will not start..
replace the distributor oil is leaking into the electronics of the distributor and shorting out pull cap back off and look and see if oil is leaking out
SOURCE: self diagnostic test codes
anytime you do the self-diagnostic you will almost always get those 2 codes.
12 - direct power input to the PCM has been disconnected within the last 50 key-on cycles
55 - End of error messages
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