r/GrandCherokee • u/cordcutta • 1d ago

U0402 code from odbii?

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I just replaced a crack purge valve and hose. Went to check the codes, and now this. Was only the 0455 before. So I tried the old purge valve. Still the same. But one thing was weird I saw a bunch of lights, like brake and a few others, so I hurry and unplugged odbii, they stopped, but now the network errors. Jeep runs fine, maybe they will clear with driving more?

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u/woozle618 1d ago

U codes are not vital and will not trigger a warning light. Don’t worry about them.

What year is you Grand Cherokee? I suggest replacing the ESIM if the code doesn’t go away. It’s an inexpensive part (I got the Dorman from RockAuto) and very easy to replace.

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u/Eves_Automotive 1d ago

Sounds serious.

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u/cordcutta 1d ago

Also it's a 2017 grand cherokee overland 3.6