Hard shifting

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03-02-2011, 05:42 PM

markcarter100

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Hard shifting

I have a 2004 XJR. Recently, the car started shifting hard from 3rd to 4th gear. It also lunges a little when I stop. I'm not getting a check engine light, but I am getting codes P1111 and P0784. I read the P0784 could be a faulty shift solenoid valve, harness, or connectors. Does anyone know where the shift solenoid valve is located? Or can anyone shed some light on what the problem could be?

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03-03-2011, 10:52 PM

veffremov

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Join Date: May 2008

Location: Orange County, CA

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There is a service buletin that the ZF adaptive shift points are drifting over time and the TCM needs to clear the adaptations are re-learn. It cured the hard shifting for me.

The dealer needs to clear the TCM memory with IDS procedure.

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