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2012 JKU goes into limp mode

Discussion in 'Wrangler JK (2007-2017)' started by brfan, Feb 24, 2026.

  1. Feb 24, 2026 at 1:12 PM
    #1
    brfan

    #1
    brfan [OP] New Member

    Joined:
    Feb 24, 2026
    Member:
    #10059
    Messages:
    1
    Gender:
    Male
    Vehicle:
    2012 White Wrangler Sahara Limited
    My son’s 2012 JKU recently left him stranded. After driving 2 hours or so the Jeep went into limp mode. The mechanic I got it towed to thinks it’s electrical because it has a lean code(P0174) as well, but shouldn't cause it to do what it did. After it sits for an hour it runs fine so it’s very hard to recreate.
    Additionally he said its throwing a B2204 code and he thinks this is the issue. He said he couldn’t find any grounds that were bad. He let it run on the rack for two hours. Checked every electrical connection he could get to. Never could re-create the problem. He doesn’t think it’s a vacuum leak.
    Is replacing the WCM the answer here? I have been chasing this issue for a few months. But it rarely occur because my son doesn't take many long trips.
     
    brfan, Feb 24, 2026
    #1
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