Skip the auto shop - Our mechanics make house calls

Q: Why do I have to jump start my car?

asked by on

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.

A: This is generally a sign of a weak battery ...

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.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Vehicle died, but it's not the battery

Hi, a few things can cause a car to die while in traffic. Battery connection is one thing. Check the terminal and make sure it has a clean connection. Inspect the drive belt to make sure its intact and not...

Q: How much is it to bleed 4 brakes - one bleeder screw broke off

Hi and thanks for contacting YourMechanic. Use a small drill bit and drill out the bleeder screw. Get an extractor kit and remove the remaining bleeder screw. Once the bleeder screw is out, put in a new bleeder screw. Then...

Q: Car stalled, now can't engage any gear - 2015 Honda Civic Si

Hello - it is possible that your transmission has a broken shaft internally. Honda issued a Recall (#15V574000) which addresses this issue. A software problem causes damage to the drive pulley, which results in a "no gears selectable" situation as...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...