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Old 11-15-2019, 12:29 AM
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White Smoke from Exhaust on a 2018 JK?

Hey all,

First time posting here, I'm hopefully a soon to be JK owner, While looking over a 2018 Wrangler Unlimited Sport S at a dealership today, as soon we turned the engine on, what appears to be white smoke came from the exhaust.

Here's a short video of it: http://https://youtu.be/Sso4xDkrpyI

It doesn't appear blue at all and I didn't pick up any particular odor.
It was somewhat cold out, around 40-50 degrees.
I checked a second Wrangler out only a few hours later to compare and there was no smoke whatsoever.

Here's the video: http://https://youtu.be/I9ssav9hgZk

So I thought I would see if the much more knowledgeable people here could shed some light on what the most probable cause of this issue is? And if something like this should dissuade me from buying it?
It does come with a warranty.


This might be unrelated but the only other issue was a ODB2 code B2390, Mist Switch Circuit Low. When checking under the hood, the windshield washer fluid reservoir cap was missing and hardly any fluid was left. It seems like it might have spilled or leaked out because lots of fluid was dripping from the front.

Hopefully this isn't the wrong place to post this. Thanks!

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Old 11-15-2019, 06:29 AM   #2
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Location: Metro Detroit MI
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White exhaust "smoke" after warm up is usually caused by coolant entering the combustion chamber and being vaporized. Causes - head gasket leak, cracked head, cracked block.

I'd stay away from any used vehicle that puffs out white exhaust.
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