1998 plymouth voyager getting codes p0500,p1698

You need a professional to work on it

Test the battery,it may have failed
Check the cables

You have an ECM no CCD message from
the TCM Module

Beyond anything you can do, but use the vehicle
& ruin the transaxle

Well code 1698 means the engine computer could not communicate with the transmission control module. I doubt that would kill the engine, but there could be a wiring problem somewhere.
It could be a faulty relay too.

Check crankshaft sensor.

ECM electronic control module not working may be a loose wire or bad ground

P1698 DODGE - DTC Detected in Companion JTEC Mod

This is a thread of people with the same problems, I don't think that the computer has anything to do with this problems.
http://forum.chryslerminivan.net/showthread.php/6685-Code-P1698-and-Faulty-Instrument-Panel

check all your fuses

P1698 No CCD message from TCM , have no idea what it means though as a europeon model of the same vehicle just says cannot connect on my reader

First, remove battery negative cable.Then I would remove kick panel (by right foot when sitting) on passenger side & locate BCM (body control module) . remove the harness connector to it & spray well with contact cleaner in connector & on module where they meet. Let it dry a bit, then re-connect it & re-connect negative battery terminal, and see if that helps. It's not unusual for these codes to come up & make one think that a part needs to be replaced, when it's just a bad connection.

you need to go over your entire wiring harness, under the hood and inside the dash. Start with the ground wire on the battery and work your way inside. It sounds like there is a loose ground wire somewhere