P1056 code

i parked my car at my friends house then about an hour later I got into my 04 fx35 and it wouldn’t start back up I changed my alternator and my starter already and I tried reading the code and it said P1056 what does it mean ?
 
It could be so many things without a trouble code it just becomes a process of elimination.
Getting fuel?
Getting Spark?
 
I had a "pending code" for the driver side cam position sensor. No check engine light. If it weren't for the hard start and decreased power in the low rpm's I wouldn't have checked the scangauge. When the knock sensor went out months ago, same scenario.
I think if the issue is reoccurring or imminently problematic then a code is thrown with a light.
 
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