Electrical contacts in the tail lamp housing tend to break or melt, which can cause the brake lights to fail or work intermittently. Complete inspection of the tail light housing and bulbs is recommended before replacing any parts.Google+
Car Problem Reports
Jeep Grand Cherokee Electrical Contacts in the Tail Lamp Housing May Break or Melt
Jeep Grand Cherokee Problem
Average Mileage: 141,065 mi (13,100 mi - 285,000 mi)
Visitor, 2000 Jeep Grand Cherokee, 238,000 mi
When the head lights are on the left brake light will not work.
Visitor, 2000 Jeep Grand Cherokee, 135,768 mi
all rear lights work untill you push breakpedel,then the pass-side will go out.let off break pedel they come back on.
Visitor, 2000 Jeep Grand Cherokee, 225,000 mi
I have had a tail light/brake light issue ever since buying my Jeep used in 2004. I have replaced the sockets, used aluminum foil as suggested as numerous forums and last February eve bought an entire rear light assembly. A few months ago the passenger side tail light stopped working again. I can't figure it out and am afraid of being ticketed or worse, involved in an accident. So disappointed in Jeep for not coming up with a solution to a KNOWN issue.
Visitor, 2004 Jeep Grand Cherokee, 160,000 mi
Driver side brake light out. Followed instructions found on-line to pry up contacts with flat head screwdriver. No problems since...approx 6 months ago.
Had problem for years with rear passenger side light brake light burning out.
Finally went to a salvage yard and got a replacement light unit..end of problem.
Examination of the old unit revealed fused metal on light contact with unit, apparently
shorted and overheated breaking the contact
Visitor, 2000 Jeep Grand Cherokee, 258,031 mi
Due to the housing being plastic the contacts pull apart due to melting. I have replaced the entire light bar twice, at a significant cost, and replaced the socket only on two separate dates. When the light goes out now I open the contacts again until they can make a complete circuit. This however is only a temporary fix, sometimes it will last for several months. Jeep is aware of this problem but will not retrofit due to cost on their end.
Visitor, 2004 Jeep Grand Cherokee, 200,000 mi
So I've had the problem with the right tail light in my grand cherokee 2004;
When the lights were on, the brake light wouldn't work. I couldn't solve it until my turn signal/hazard light stopped working as well.
Replacing Turn Signal Flasher that's next to the steering wheel solved all the lights problem.
It was only $32, find it on parts geek website, good luck!
Visitor, 2004 Jeep Grand Cherokee, 107,000 mi
Passenger side: when hit brake lights no lights work on passenger side, no talilight or brake light have swapped sockets with driver side, see alot of rust around contacts where sockets twist in or passenger side, the driverside is fine. Also turn signal quit working, twisting of socket got it to work and some smacking on the back of taillight (circut board) but now cant get reverse lights to work. Think im going to have to get new taillight or get new circut board on passenger side...having problem unplugging wire harness from it now..will hopefully find help so I dont have to take to expensive mechanic..
Visitor, 1999 Jeep Grand Cherokee, 146,000 mi
Both the brake lights and taillights stopped working. I adjusted the contacts as suggested by numerous forums and that fixed the taillights but the brake lights still do not work. Now the brake light fuse blows as soon as I turn on the vehicle. Not sure where to go from here. Clearly there is a short somewhere.
Visitor, 2000 Jeep Grand Cherokee
Still battling with tail lights. Have replaced bulbs, bulb inserts, and whole taillight assembly. Still not working. I've had to deal with this issue every couple of years. Jeep won't recall or remedy the situation as, "there have not been enough fatalities" to warrant it.