Skip the auto shop - Our mechanics make house calls


asked by on

I noticed yesterday that the battery and brake lights were on when I cranked my car. The car ran fine. I went out last night to run an errand, the lights were off and it still ran fine. This morning the lights were on again and stayed on. Then i began to lose power as I went to take off from a red light. it wouldn't go more than 15 or 20 mph. i pulled into a parking lot and turned the car off. I went to crank it and it wouldn't crank. I tried again and it cranked but still had little power. A few minutes later the dash lights went off and I had full power. What could this be?
My car has an automatic transmission.

It sounds like you may have a faulty or sticking brake light switch. When this happens, this creates a draw on the battery and the electrical system as the power is being directed to the brake lights. As a result of the brake lights staying on for an extended period of time, it may be possible that there was a significant drain on the battery which would explain the lack of power at the red light. I would recommend having an expert from YourMechanic come to your location to diagnose and repair your brake light and inspect your charging system and battery.

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
  1. Home
  2. Questions

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: Do i have to go buy the parts or do you provide them

There are a number of things that may cause a rough idle. A rough idle may be caused by things such as low fuel pressure, low voltage to the fuel injectors, dirty fuel injectors, a vacuum leak, a faulty Oxygen...

Q: Is it possible that my mechanic broke a motor mount while changing the oil or replacing a power steering pressure hose on my car

Hi Charles. Thanks for contacting us. Typically an engine mount is not touched when an oil change or power steering hose replacement has been completed, so I would initially suggest that it's less than likely that the previous mechanic caused...

Q: Emergency brake light won't stay on. If really cold in the morning, it's out until I drive for about a mile or so

Hi there. Check the cables to the parking brake when you set the parking brake. There is a parking brake sensor attached to the pedal and if the sensor is tripped, the indicator brake light will come on the dash....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.