A/T gear position indicator does not indicate shift lever positions
Transmission range switch defective or out of adjustment
Shift cable broken or out of adjustment
Joint in shift cable and transmission or body worn
Check the D indicator, and check for loose connectors. Inspect the transmission range switch. If the transmission range switch is
faulty, replace it. If the transmission range switch is out of adjustment, adjust it and the shift cable.
Check for a loose shift cable at the shift lever
and the transmission control shaft.
You could just have a bad brake light switch or a bad shift interlock solenoid. Verify connector "E" on the driver fuse box has a good connection at pin "E17" the Blue/Black wire that is the park input from the transmission range switch. The connector is located on the front side of the fuse box and is a 20-cavity connector. If the connection is good, then locate the transmission range switch and check the connector there and verify the Black wire to ground G101 on the thermostat housing is good. If the wire harness/connections are all good, start by replacing the transmission range switch.
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...
New Dad New Van, thanks for quick response - Brake Pedal Position Switch seems fine, brake lights light up as soon as brake pedal is depressed. This was in fact the first thing I checked because it seems to be a common problem...
The P light is unique among gear indicator lights in that the driver's multiplex control unit controls it (along with the transmission range switch). That same unit also controls the shift lock solenoid. Maybe the driver's side multiplex control unit is flaky or the connector is dirty?
Your brake pedal switch has two sets of contacts. One set is devoted soley to the brake light circuit. The other services items that depend on sensing brake pedal position. My brake lights worked fine on one of our Odys, but I couldn't get it out of Park because of those second contacts.
I have a question in regard to the gear range switch. I did the continuity check as suggested in the pdf's posted by New Dad NewVan. The ohms check all read about .2 ohms, except the neutral position which read 1.05 ohms. Normally I would call it good but since I am having a problem (shift lever in Park but the D light on) I wonder if that reading is out of range ( 1 ohm vs. 0.2 ohms). Any suggestions appreciated!