Why do I have to jump start my car?

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My 2015 chevy suburban does not start with out being jum started, I got the battery checked and it's good battery, do you know why this is happening

My car has 51234 miles.
My car has an automatic transmission.

This is generally a sign of a weak battery or a failing alternator. If the car starts without any problem when being jumped, this is generally a sign of a lack of power from the battery which means either the battery itself is dead or the battery is good and the alternator is failing to charge it properly. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator. The voltage regulator is a unit that regulates the charging of the battery by the alternator. Often times this will result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. In some cases when a battery is too weak or damaged, it may no longer hold a charge for any length of time, in which case the alternator may be doing its job, but the battery is just simply too weak to hold a charge. In either case, I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

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