Skip the auto shop - Our mechanics make house calls

Q: With car off, exterior and interior lights start flashing

asked by on

The battery in my car was replaced just less than a year ago. I had gone home during the day for a couple of hours and when I returned to my car the headlights and tail lights were flashing, plus the interior lights in the car cabin were also flashing. I tried to start the car, but it would not start. The radio and windows were working, along with other things in the car, but it would not start. When I turned the ignition, it sounded like the electronic fuel pump was engaging, but when continuing to try to start the car, nothing happened. Also when I try to start the car, it does not have that usual clicking noise you usually hear; there is only a humming noise. Later, the exterior and interior lights stopped flashing. But every time I open the driver’s door and when I turn the key, the lights start flashing again. The headlights were not on when I turned off the car. I found that the battery post’s positive cable was extremely loose. I tightened it and jump-started the battery, but that did not help the problem. What is causing this problem in my car?

It sounds like somehow the anti theft system was activated and drained the battery. Try locking all of the doors from the inside and close them. Then lock, unlock, lock and unlock the doors to see if the problem persists. You will likely have to get the battery charged and tested.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Air Mixture Blend Door Actuator

Yes, the air mix control motor is a replaceable part according to Honda service information. For this particular repair, I would bring the car to your local dealer to have the part supplied and repaired for you. If you are...

Q: 2000 escalade will not lock with the key in the ignition, it only chimes and doesn't engage lock.

Hi there. If the driver door is not locking with the door ajar and the key in the ignition, that is normal. If all of the doors are not engaging the locks with the key in the ignition and the...

Q: Car won't start.

The performance of the battery and charging system must be checked. There may be a problem with the alternator recharging the battery especially if the vehicle required a jump-start after a new battery. Hire one of our expert technicians to...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...