Q: 3rd brake light on

asked by on

3rd brake light wont go off. About 3mo ago this happened and they changed the little plug under steering wheel on the drivers side...they saw pieces of plastic on the mat and changed the plug. Light went off. No 3mo later back on! Light is on whether car is turned on or is off. I dont want it to drain my battery! I slammed the hatchback to see if that would work and it did not. Why is that light on? thanks

My car has 290 miles.
My car has an automatic transmission.

Hello. From what you describe it would appear that your vehicle is experiencing some sort of electrical issues. If only the third brake light stays illuminated, not the left and right side brake lights, then that is a sign that there is an issue with the third brake light circuit. I would verify that the switch that was recently replaced is working properly as it’s failure could be what is causing the issue to reoccur. If the light stays on even with the car off then that is a sign that the light is getting power somehow, perhaps due a fault with the switch, or an electrical short. If the switch is good then I would move to looking at the third brake light connector, socket, and wiring to see if any of them may be damaged and possibly causing a short. It may also be possible that the short is somewhere away from the brake light assembly, perhaps somewhere in the harness in the interior or on the undersides of the vehicle. If the light is staying on then you can prevent the battery from draining by disconnecting the battery when the car is off. This will, however, require you reconnect it every time you wish to start the vehicle. As electrical issues like these can sometimes be difficult to diagnose, I would recommend having a professional techician, such as one from YourMechanic, visit your location to diagnose what may be causing your third brake light to stay on.

Was this answer helpful?
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
  3. 3rd brake light on

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: Trunk won't open with seat latch

If you normal trunk release will not work to release the trunk then you will need to access the trunk through the rear seat back by removing seat. Once seat back is removed you can access the latch manual release...

Q: The clutch pedal has lost all tension what should i check?

The clutch pedal going all the way to the floor without disengaging the clutch is caused by a failure in the hydraulic clutch linkage. There is a clutch master cylinder (and reservoir) and a slave cylinder down underneath near the...

Q: I have a 1997 ford ranger. I was informed by highway patrol last night that none of the lights on the rear of the truck are workin

Hello, thank you for writing in. There are several different lights at the rear of the vehicle. They are run off of different circuits to control them separately and in order to keep them from all going out at once....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...