2005 jeep grand cherokee......my 3rd back brake light is out. could I replace the LED assembly myself?

Have you checked to see if there is power to the light socket? There is no separate fuse, so if there is no power to the socket, there must be a broken wire. The only thing you can do is trace the power supply to locate the break

it is a sealed unit and has to be replaced

Pretty common problem if you have a weak or bad ground, check all the ground connections by the back lights.

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my jeep does the same thing. do you know if your 3rd tail light is out? i have a theory.

Check fuse panel, under dash, as well as under hood. Owners manual should also give you map of fuses. May say"park" lights, "running lights", or something similar.

checked all fuses even under hood? may have bad signal switch or bad brake light switch yes even if 3rd brake works.also check wiring under rear fender by bumper thats were wire harness is hope this helps.

you dont have to. just replace your light bulb again only this time donot allow any part of your hand to touch the glass use a napkin or any mateial that is oil free. the oil causes the glass to overheat thus causing it to fail early.

If this vehicle has an aftermarket towing package installed check for the trailer hitch wires shorted or kinked under the vehicle.

Problem is a faulty Steering Angle Sensor (part of Steering Module) located in steering column ...replacement part $600.00.

have a look at your brake pedal lever (inside the car) there is a brake light switch there which could be in need of adjustment