If I understand correctly, the engine always cranks/turns over, but fails to fire.
There's a vast number of possiblities, such as bad connection on the fuel pump, a bad fuel pump relay, or bad spark plugs or coils.
The fact that it's intermittent will make it very difficult to track down - you'll need to work at trying to eliminate each possiblity to home in on the problem.
Considering you got the system voltage code, I suggest you check all the main connections and grounding straps.
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Sometimes it will crank sometimes it wont
Linear Mode
