Honda Accord won't reverse uphill

Sounds like marginally low transmission fluid. On the incline the pump and filter isn't fully covered.

https://www.google.com/search?q=1996+chevy+tahoe+transmission+fluid+level+check

..

full power up hill
dies flat, ?
stalls and can not be saved with a fast right foot.
key point that... very key....!!!!

Based on Info...
Possible Sun Gear Failure, or Other Internal.
Check Fluid Level. Although it Seems Damage is Done.
Remove and Replace.

Check the fluid level. Automatic transmissions won't go into gear without enough fluid. If it's low, you've probably got a leak somewhere that you need to find.

Likely it's a coil or the ignition module. Sometimes it's a computer, but not as likely as the former two.

This is normal, depending on the depth of the hill. This is frequent with standard/manual cars on uphills, they can roll back, but with automatic vehicles they usually have a small amount of throttle, (you'll notice this when putting your vehicle from park into drive with your foot off the break, it'll start slowly moving forward)
Now on the hill, if it's a steep incline your car will move backwards, it all depends on how high your throttle (the car itself) is, and the incline depth of the hill.

The lights have nothing to do with your car not going in reverse. I know this is going to sound silly but, are you releasing the parking brake? That brake is the lever between the front seats. Are you taking your foot off the brake?

I know they sound silly but you would be surprised at how often this happens with th eparking brake.

When you put the car in reverse can you feel the transmission engaging? You should feel a slight **** when you put it in reverse with your foot on the brake. If you are not feeling this, your transmission needs to be repaired.

Code P0108 means your MAP sensor circuit is open. MAP means Manifold Absolute Pressure. You should be able to buy one at your local parts store - otherwise, the dealer.

just un plug it from the motor for now ,sounds like the auto park connections have a fault

your motor mount is probaly bad and needs to be checked