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Shift (Park) Interlock Doesn't Work

996noob
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996noob Member

996noob

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On a '98 996 the Tip shifter and selector button are locked when key is off, but once I turn the key, the Tip button is unlocked and I can shift out of Park. But this is without pressing the brake! So there is no safety anymore!

I've replaced the brake switch and the Tiptronic shift lock solenoid at the base of the shifter box, and it's still the same.

Any suggestions where to check next?

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996noob Member

996noob

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Looking at the wiring diagrams, I found that the signal from the brake switch is fed to the Tip CU, and the Shiftlock solenoid should then be activated. I will be checking these signals on the wiring and will update everyone. Meanwhile, if anyone has more info or has something to suggest, do chime in. Thanks!

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