ignition brake shift interlock problems!!

My 98 GMC Envoy transmission shifter would not release from Park. Has anybody had problems with the ignition brake shift interlock system that could shed some light on the problem? The Vehicle starts fine, but doesn't
release from park.
Gary
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Park unless your foot is on the brake pedal. Perhaps see if your brake lights come on when you press the brake pedal as a first step.
Also, there is usually a "towing" procedure, to get the car out of park, described in the manual. This is in case the battery is totally dead; you can remove the boot around the shifter, and use a small screwdriver to mechaniclaly get the shifter to move. This might help you get the vehicle drive-able.
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