Q: Brake lights on trunk not working

asked by on

The brake lights on my trunk aren't working. This is after replacing all the bulbs and fuses (even though the tester said they were fine.) the brake light in the rear window works, and the tail lights work. Blinkers, reverse lights, headlights, high beams - everything works except the trunk brake lights. The only other thing not working is my cruise control. Might that be related? If not, what would cause the brake lights to stop working just on my trunk?

For some reason, when consulting the wiring diagram, I don’t see a trunk mounted brake light listed. I only see the high mount (one in the rear window) listed. Regardless, if the trunk bulb is not working with a new bulb, there is a problem with the circuit. Check for both power and ground at the bulb. Once you’ve determined which is lacking, you’ll have to trace the circuit to determine where the problem lies. Since you said all of the other brake lights work, the cruise control is likely unrelated. Electrical diagnosis can be difficult, so I suggest you have a trained professional tackle the problem with your brake lights for you.

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. Brake lights on trunk not working

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: Q: Brake lights not working

The stop lamp switch most likely failed and is not making contact internally. The switch may need to be adjusted or replaced. I recommend seeking a technician, such as one from YourMechanic, to come and test your vehicle's brake lights...

Q: Q: Malfunction indictor lamp comes on and car won't move

A few different things have the potential to cause the transmission faults you have described. The most common would be a transmission position sensor/range switch, neutral safety switch, shift solenoid, low fluid level, or the transmission itself. I'd recommend getting...

Q: Q: Engine has sludge.

Replacing an engine is a very costly repair. Oil sludge often results from contaminated or neglected oil. Not having oil changed at regular specified maintenance intervals will cause sludge to build up inside the engine. Sludge if not excessive can...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...