The problem is likley caused by a defective brake light switch it is located under the dash above the brake pedal arm you must remove any under dash covers to see it.
2006 jeep grand cherokee third brake light not working.
The brake lights on my 2006 jeep grand cherokee quit working yesterday.
Push the bulbs and turn them counterclockwise to remove from the socket.
If both brake lights out then is likely the stop light switch at pedal.
My 2006 jeep grand cherokees rear passenger tail light does not work brake light turn signal works.
If is just one side not working then is likely the bulb.
What is causing this problem.
Brake lights stay on running or not lights on or off for 2006 jeep commander.
Blown out light bulbs are the most common reason for why the brake lights not working but the tail lights are.
Your heading says left brake light but your story says no brake light.
The bar light is still working.
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Remove the screws from the bulb lens which you can access through the trunk or see your vehicle repair manual to get the exact location.