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Old 09-15-2019, 12:00 PM
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Immobilizer issue

Decided to do a Transmission oil filter service this weekend. Dropped the pan replaced the filter and filled. When I went to start the engine, the dash doesn't show the car in park, and the car won't start. Moving through the gears has no effect. I pulled the gear position sensor and the continuity seems fine. When I fire up INPA, it shows questions marks and zero for the gear position and it doesn't show any codes.

Is it possible I caused an issue when I dropped the pan? What am I missing, what should I look at next?

2001 X5 4.4 with the ZF5HP24 Tranny
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Last edited by computergui; 09-15-2019 at 12:15 PM.
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Old 09-15-2019, 12:23 PM
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Immobilizer issue

That's the symptom of dirty connector plug on the back of the transmission. Mine actually said I was in gear 54 once.

If you broke a wire off inside would have the same effect.

Check the external connector first then you'd have to take off the pan to check inside. Theoretical a wire could have gotten pinched and shorted to ground
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Last edited by andrewwynn; 09-15-2019 at 04:53 PM.
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Old 09-18-2019, 06:55 PM
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So apparently I cut some wires on the gear position sensor causing the TCM to flake out. One new (to me!) TCM later and we're back in business!!! Maybe I should take the time to make sure all the wires are good before buttoning up the tranny pan. Thanks for the help Andrewwynn and all the others on the forum. I found a older post that nailed my symptoms exactly that led me to the TCM.
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Old 09-18-2019, 08:00 PM
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I would look at the readings for gear position before putting the bottom on the tranny.


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