No power to car

I had to jump my car off because I let it sit for a few weeks drove it for a hour then it shut off in traffic now no lights come on but my hazard lights

My car has 140000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Your alternator and battery may be the cause of this problem. You should have the battery completely charged and load tested first. If it fails testing, then replace it then test the charging system. When the battery was dead and only jump started, this may have caused the alternator to get burned out and then the car stalled due to low electrical power. If you would like an expert to inspect this, a certified technician from YourMechanic can come to your car’s location to diagnose and repair the loss of power.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Can You Jumpstart a Car With a Bad Alternator? It`s possible that your car will start even if your alternator is bad, but it will probably stall once the battery runs out of enough power to keep things running the way they should.
An effective method to determine whether it`s your battery or alternator that`s gone bad is to connect jumper cables from a running vehicle`s battery to yours. After a few moments, try starting your vehicle. Once it`s started, remove the jumper cables — if your engine stalls, your alternator has probably gone bad.
If your alternator fails when you`re far from home, you can typically drive up to 200 miles on battery power alone. That`s assuming your battery is in good shape and fully charged. Of course, it`s best to get the alternator repaired or replaced as soon as you can.
A bad battery won`t damage the alternator, but a bad alternator can damage a battery. The car battery simply isn`t made to deliver electrical energy for extended periods, so both components need to be functioning optimally.
A faulty or dying alternator may only work in fits and starts. As a result, the alternator may not have what it takes to keep your battery fully charged — even with your engine running. As a result, you may find your car stalling out at odd times.
If your vehicle won`t start, it`s usually caused by a dying or dead battery, loose or corroded connection cables, a bad alternator or an issue with the starter.
The Likely Culprit: Starter

If you`re unable to start your vehicle, check and see if the headlights and dash lights come on. If they shine bright and clear, that means that the battery and alternator are likely not the cause of the problem. If they were, there wouldn`t be enough power to run the lights.

It is possible in some cases to jumpstart a vehicle that has a faulty alternator, as long as the battery has enough of a charge to keep running. However, the alternator should be replaced as soon as possible.
How Long Does an Alternator Last? Alternators have an impressive lifespan of seven years–or between 80,000 to 150,000 miles.
Simply check the voltage of your battery by touching the multimeter prongs to the terminals with the car shut off. Take note of that number; it should be somewhere in the 12-to-13-volt range, according to Hines. Then, start the car and check the voltage at the battery again while the vehicle is running.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I put the wrong key in my car and a few weeks later my car just shut down and it will not start I believe it’s the computer but…
ANSWER : Hi there. What had happened is the wrong key set the security to the vehicle. This is to prevent the vehicle from starting with the wrong keys. Try removing the battery cables (+) and (-) for 13 minutes. During that time, put the original key in the ignition and turn it on. Activate everything in the car even though there is no power. Then remove the key and hook up the battery cables. The computer should have reset and reset the security. If the security is still being tripped, then I recommend seeking out a professional, such as one from Your Mechanic, to help you

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Power steering loss, no belts are turning but the car is running fine. I also have a soft pedal. Whats wrong with my car?
ANSWER : I have only seen this situation once in my 30+ years and it turned out to be a broken crankshaft pulley. Belts are driven by the engine. The crankshaft pulley spins the belts, which in turn spin the air conditioner compressor, power steering and water pumps, and the alternator. The vehicle should be towed to your local repair shop and not driven. Without the water pump spinning to circulate the coolant, the engine will quickly overheat and result in more extensive damage.

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My car is having power issues. I get a message that says engine power reduced/ service traction along with headlights flickering and engine cutting out.
ANSWER : Hi there. Check the battery and alternator to the vehicle. With all of the electrical issues that you are having, it sounds as if the battery is not charged and making the engine stall out due to lack power. Check the battery for a 12.6 volt reference and load test the battery. If the battery fails, then replace the battery. If the battery passes, then check the alternator and see if its putting out the full amount of amps. If you need further assistance with electrical issues, then seek out a professional, such as one from Your Mechanic, to help you.

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Can i drive my car even when the "engine power loss" alert turned on?
ANSWER : Hi there. A Reduced Power light usually indicates a fairly serious problem with the throttle system. When this light illuminates the vehicle will often go into a “safe mode”, which will severely limit the speed of the car and in some cases will render the vehicle non-driveable. Since the Reduced Power light can trigger for a number of different reasons, tracking down the exact cause is extremely important, if the vehicle is not properly diagnosed and repaired, the Reduced Power light will trigger again, putting the vehicle in safe mode. I would recommend having a professional mechanic come to your location and complete a reduced power light inspection.

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Car won’t start, no power, doesn’t even crank engine.
ANSWER : Hello, thank you for writing in. When it comes to the vehicle not starting, and not having electrical power, always start by checking the battery. In your situation you can go remove the battery from the vehicle, and take it to have it tested. If it is bad, simply replace it and drive the care home. During this process make sure the battery cables, ground connection, and connection to the starter are all clean, dry, and tight. If the battery is not bad, then you may have an ignition cylinder issue. This may come in the form of a connection issue, or some kind of other mechanical failure. There may also be a problem with the starter. Only further testing will tell. For more help resolving the issue, contact our service department and they may be able to help you where the vehicle sits now.

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The car has no power, the ignition relay keeps making a clicking noise, and the car won’t start
ANSWER : I suspect you have a dead (or very low) battery, a failed alternator, and an electrical circuitry problem as well. It may be hard to tell which came first if there is wiring damage already. The clicking you hear is likely the starter solenoid not getting enough power because of a dead battery.

If the car shut down while driving, that is usually an indicator that the alternator is not charging the system. Once you have jumped it off, it should continue to run on the alternator. The failure to run more than 10 mph and the smoke from the engine compartment suggest very low system voltage and additional wiring problems sapping all the electrical system’s power.

I would recommend having a professional mechanic, such as one from YourMechanic, perform an inspection to determine why the battery will not hold a charge and assess any additional problems with the alternator.

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Replaced alternator on car 2 times each time shows it’s charging 14v let car run for a little bit then test drive and car voltage
ANSWER : There are reports that the replacement alternators will not communicate with the engine computer and will not charge correctly. I recommend using only the manufacturer approved replacement part. It can be new or remanufactured but approved for use in the vehicle. Some lower cost alternators on the aftermarket will have charging problems since they will not communicate with the ECM on the vehicle and will stop charging.

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My car is losing all engine power off and on when driving
ANSWER : Hey there. With a problem like this, it is a great idea to start with the fuel system. The fuel pump and filter should be checked. These need to be replaced together anyway. Depending on how many miles are on the vehicle, if it has over 100,000-150,000 miles, that fuel pump is going to be tired. It would better your fuel mileage and help other components to have it replaced and is probably a good idea to do this in the first place.

Something like this can also be throttle-related. The throttle should have been inspected when they had it in the shop, but you may want to have it looked over again. If the throttle reads, there is nothing being pumped into the engine and the engine will die. The idle control should keep it running, but with severe wiring damage that may have been effected as well. The only way to figure it out, without trial and error, is to have the car stall when a technician is present with a scan tool and the ability to test several things.

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