Don't know if the systems are even remotely the same, but for weeks could not shift my 96 960 Volvo out of Park, it was the shift interlock system, and it turned out to be a $27 microswitch which routinely fails. Althoug it appeared fine, it was the problem. I overrode the switch and now car shifts fine.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro