It sounds like it'* searching for the "end of the tape" which doesn't exist on a cartridge of course. I'm lazy at times so my next step, were it my unit, would be the spray contact cleaner in it with the small plastic straw tube thing on the can and see if that would maybe help clean the mechanism or micro switch. The real contact type cleaner is non-conductive and evaporates rather quickly with no residue. Now, I'm not saying it would work and fix things by any means but I'm a contact cleaner shooting son of a gun into switches and contacts (in their off position of course just to be safer) because I hate pulling the darn dash or such out to pull those little suckers out to clean or change them. I have a pretty good track record if the contacts aren't burned to pieces inside of them. Contact cleaner FTW!!!

Sorry to hear it is still refusing to come out, sounds like the unit may have to come out of there, and be opened up, or you may want to just try to splice on an aux input.
Only other option would be a new deck, hopefully you find an easy solution.

E10 : Tight tape error Cause(*): A restricted cassette tape transport or broken cassette drive belt Correction: Substitute a different cassette tape. If there still is an error code, service the unit at an ACDelco® Service Center.

E11 : Broken Tape Error Cause(*): A broken cassette tape Correction(*): Substitute a different cassette tape.

I have some of that cleaner and will give it a try!

Haha "substitute a different tape" is their best suggestion. :P I would if I could get this darn one out! Obviously their error code solutions don't help with THAT problem.

Yeah that is GM troubleshooting via error codes for ya. lol


It really sounds like the tray that ejects the cassette may be jammed, my guess is still that it warped a bit from being left in there so long.
Years back I had something similar happen, it was from a regular cassette being left in there too long, I have also seen CD'* warp and have trouble ejecting, of course the deck has to get really hot for it to happen, it is a possibility.
And if it is warped bad enough you are going to have to remove the deck, open the unit up, and help eject it from the rear part of the cassette, it may even need some power going to it while doing so, but you will have to be really careful working with anything getting juice, you don't want to get electrocuted.
You should be able to roll the gear that lifts the tray and ejects it by hand, that would be the safer route, if the tray is already lifted the cassette up then that won't be necessary, a shove from the backside should be enough.
If all else fails I'd be happy to help you find an aftermarket deck, unless you'd rather check a salvage yard for a stock radio like you have.