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!
  1. Home
  2. Questions
  3. With car off, exterior and interior lights start flashing

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: 2008 Acura Swab links replacement. How much ?

Hi Krupali. Thanks for contacting us today. If you're needing the stabilizer bar links replaced (sway bar) on your Acura, and looking for an estimate, please click this link to request a quote. Thanks.

Q: My bus is not starting.

It sounds like you may have a problem with your key. If the key is excessively worn it will not be able to unlock the ignition cylinder so you can turn the key. I would ask for help from one...

Q: Car won't start keeps clicking. 2004 Dodge Durango

Hello. A click noise when the engine is started is usually attributed to a bad battery or connection. If the battery was recently replaced, I would make sure that it is adequately charged, and that the battery terminals and cables...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.