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New after market tail lights can be found for around $75.00 to $80.00 each on ebay, Check Rock Auto and several internet sites. It is a simple job to replace it yourself with two screw drivers and 5 to 10 minutes.



If you are cheap like me, I would remove the existing one, inspect it for cracks, and if not broken, reseal it with clear silicone. These 2 piece headlights and tail light fail quite frequently on all kind of cars and trucks. I usually just reseal the top and sides with clear silicone and depending on the design, drill a very small hole with the smallest drill bit that you own in the bottom at the lowest point to let any accumulated moisture drain out. I probably have repaired 30 of them in the last 15 years. Do not seal the bottom as you want water to escape from there if possible. Some of the newer ones already have a drain hole in them. I have seen a few where the hole was there but not drilled out completely.



Make sure that the light bulb assembly is installed correctly and tight. Some have a foam rubber seal on them. If there is no foam seal or it is missing, a rubber o-ring would fix the problem.
 

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Seems like the previous generation Terrain has a relatively common issue with the tailights. I remember when I was originally looking to replace by '06 Explorer we were looking at a '17 Terrain. I really liked it overall but two things kept me from the purchase and one of them was water in one of the taillights. I decided to change direction and give Toyota a try with a '17 Rav4 which I regretted and subsequently corrected.
Question is, is it a design issue of the taillight housing or is it a supplier manufacturing issue?
 

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Actually both. They are 2 piece design and glued together. It is not a solid glue like model airplane glue. It is slightly flexible. We use to heat up headlights in an oven to separate the pieces and then reseal them again with clear silicone. Then I tried to just reseal them without separating them first. It works OK.
 

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Lou, I have the same problem. I have a 2017 GMC Terrain, and the passenger side tail light collects condensation even when it is not raining. My car is kept in the garage and the only time it is outside is when I am at work. After a short, yet heavy, rain recently, I had a considerable flow of water rush out of the lift gate when opened it. I have contacted the dealership and have an appointment soon. I will let you know what they say.
p.s ignore rude people on this forum who refuse to offer advise and leave snarky comments.
Lisa
Hi I’m having the exact same problem with my 2017 Terrain. Did you ever get it addressed with the dealer? I thought about replacing the taillight but wonder if it would be worth it and not happen again? Appreciate your feedback.
 

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During a recent rain I noticed water leaking through the back panel of the hatch when I opened it up. It had been raining overnight. When I closed the hatch I saw water in the taillight. This was the right (passenger) side.How is this water getting in?
I just had the same thing happen with the right rear tail light. It has not rained in a while, but when I opened up the back water was dripping from the inside panel. I looked at the tail light and it had water in it. What is going on???
 

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Discussion Starter · #26 ·
I just had the same thing happen with the right rear tail light. It has not rained in a while, but when I opened up the back water was dripping from the inside panel. I looked at the tail light and it had water in it. What is going on???
Originally, I called the dealer, and it might have been a known defect with the taillight, or the factory installation of the taillight assembly, and the dealer never told me which it was, but they did replace that assembly for free. But by now, a 2011 might be too old for them to consider free replacement. But I did have a similar issue on another car's tail light, and I wound up removing the assembly and mixing up some two-part epoxy, and using toothpicks, I ran the epoxy around all the plastic weld edges.
That fixed that tail light.
I think the plastic welds may crack and allow humidity or water in, depending on where the weld fails.
If you try to repair yourself, use amber/clear two-part epoxy you can buy in the hardware store in the double syringe.

Also, don't use caulk, it may work for a short while, but it fails pretty fast, and looks terrible, even behind the plastic.
 

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That, would be a question to ask your dealer...
Variables that we know...It was rainning, The vehicle was in the rain.water runs down over the taillight...other than that, how would anyone on here know how the water got into your taillight.
Remove taillight there's a large piece of gray tape that's separating, coming off .water can come through and go into the trunk
 

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During a recent rain I noticed water leaking through the back panel of the hatch when I opened it up. It had been raining overnight. When I closed the hatch I saw water in the taillight. This was the right (passenger) side.How is this water getting in?
Remove taillight assembly there's a large piece of tape that may of come off....water in trunk
 

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During a recent rain I noticed water leaking through the back panel of the hatch when I opened it up. It had been raining overnight. When I closed the hatch I saw water in the taillight. This was the right (passenger) side.How is this water getting in?
 

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did you ever resolve this as our Terrain is now doing this?
Looks like he got a free replacement in one case, and on another vehicle he just re-sealed the light assembly with epoxy. If you're out of warranty I would just recommend removing the assembly, drying it out completely, then use some of that 2-part epoxy to reseal the top and sides. And verify that there is a drain hole on the bottom edge and that it is clear to allow water/moisture to escape.
 

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Epoxy along the edge of the red rim, focus on the top and sides. Look for something that says it’s clear and uv resistant. It’ll be out of direct sun but you do not want it getting yellow and nasty looking.
 

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My 2017 Terrain has two taillights that take on water when it rains. Issue is that water gets in along the top of the light. To fix you must remove the light housing and seal the top with a thin layer of silicone (I used clear GE)
The next step is to drill a 1/8 " hole in the bottom edge between the outer and inner lens (there are two and the water is between them. This will allow the water, and possible future moisture to leak out, rather than collect. Before you re install, place the light in a small box and apply a hair drier on LOW and heat the lens up for say 1/2 hour, check and repeat. Do this for about 2 hours while flipping the lens and continue until all moisture is gone. The re install the tail light. There are You Tube videos on removal of the lights. Cheers
 
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