Is my Tranny going out or is it computer problem?

Erase all codes drive see if light comes back on then recheck codes

Well let me do some research 2.2L or 3.0L?

Just to add to this one its a 3.0L if its a 2003 L300. Also thats a lot of codes did you check transmission wiring harness for animals chewing it acid from the battery damaging it?Also there is a couple of ground wires on the drivers side of engine below where there the intake tubes are. There not under the intake there in plain view some people leave them loose or dont hook them back up causing problems.

Hey saturntech9 what are your thoughts on codes P0604, U2105 and P1795?

Mostly transmission codes. Check wiring harnesses and loose connectors.

The p0604 says to replace the transmission control module the diagnoses says clear the code if it comes back replace the computer. The P1795 is a commucation code as well as the U2105 that code there screams a computer went bad.I have seen bad ecms body control modules etc set that code. With all the codes and the three codes that docfixit mentioned I would replace the transmission computer and clear the codes and see which ones if any come back. With the code P0604 that means you have a bad transmission computer so there is nothing lost with replacing it.I wolud also inspect the wiring like I mentioned before. But that wont set the code P0604.

Thanks saturntech and KHLow thought ECM or TCM but not sure which one

Your welcome docfixit anytime. Also its setting a code for a bad tcm and there is mostly transmission codes so I would start by replacing the tcm and inspecting the harness.

The tcm is located under the cowl at the base of the windshield on the passenger side. Unless you find one already programed it will have to be programed. For a price you will have to shop around. You can try www. Rockauto. Com or www. Parts. Com amazon oriellys autozone etc.

Not sure which years are interchangable with which years on those powertrain harnesses I always had the parts department let me know those answers at the dealer I worked at. Lets change the tcm clear the codes and see what cides come back. Your not really saving anytime by trying to repair or replace the powertrain harness while changing the tcm. Let me know what you find.