Honda Odyssey 2000 EX... have similar problem, hope someone can shed light..... symptoms - gear shift works fine, all gears.... transmission shift switch is also OK ( I physically removed, cleaned and tested it - contacts 1, 3 and 10 have continuity when switch is in Park position - then adjusted it on re-install to make sure N position is perfectly matched... ) - R, N, D4, D3, 2 and 1 all light up - only P doesn't light up. I have to use the interlock bypass to get out of park....the interlock solenoid is also OK....because when transmission shift cable is physically detached and re-attached at transmission and at shifter, P will light up and interlock solenoid works fine....for about half an hour, then P won't light up and interlock will not disengage...