The code seems to be very elusive and anywhere from a weak battery to a failing crank sensor, weak fuel pump or not holding pressure, weak ignition system or basically anything that can keep a vehicle from starting normally…
You are rolling the dice buying this car, it could be the best used vehicle on the planet with a weak batter, to a very costly future repair bill…
If everything else checks out during a pre purchase inspection, then I would ask for some kind of guarantee (may never happen though) that the code is nothing more than a weak battery…
Good luck…