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won't upshift
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  1. Cummins Diesel Specific Topics
    I have a 2004 Dodge Ram 3500 (automatic) with the 5.9 L Cummins. Lost Throttle control and check engine light came on. Checked fault light, it was P2122, P2127. Changed Apps sensor, P2122 went away, got back throttle control. P2127 still there. Wont upshift above 3rd or 4th gear. Anyone...
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