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  1. jkwhite

    2011 JKU sputtering on cold start

    I have a 2011 JKU that when the weather is cooler out it sputters on start. it gives me these codes P2100, C121C, U0401 and I have looked up all the codes. With that being said I replaced my throttle body actuator and had the dealership flash the new throttle body actuator in and though that...
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