Chrysler Repair: Transmission limp-in mode, chrysler sebring, mileage engine

Question
Roland,

I have a 1998 Chrysler Sebring. I had a previous transmission that continued to go in limp-in mode.I failed to mention that the trans was rebuilt when the problem first started. After the rebuild the transmission continued to go into limp-in mode. I took it back several times and they told me over and over again that the tranmission was fine and would clear the codes. The Chrysler dealer replace the control unit on the transmission and said it should take care of the problem. The dealer also said the engine light may come on agian but that the transmission would not go into limp-in mode. It helped for awhile till one night the transmission burnt-out. I just had a completely different remaufactured transmission installed. The day I picked it up it ran fine during my 25 mile road test. I took it home and parked. Later that afternoon I took it out again to run some errands and the Engine light came on again going into limp-in mode. Keep in mind when I replaced the transmission I replaced the engine completely with a Lower mileage engine so I can only conclude the it must be the engine ECU causing these problems. The engine run fine and has no fault problems. The codes registring point to the transmission which I fine it hard to believe it could be the new transmission. Roland tell me what may be going on with electronic systems?  

Answer
Hi Rodney,
My inclination would be to have a code readout done on the transmission controller (and while you are at it the engine controller) to see what the codes say is wrong to cause the limp-in. If there is something wrong with the interface between the transcontroller and the trans there is a code for that, and there are also a great many other codes for the trans itself and for the controller alone. That has to be determinative of the strategy to get to a fix of this persistant problem. If there was a fault in remanufacturing the trans then it is the trans that is at fault. It is a very complex unit as you no doubt already know. And the codes have very specific criteria to be met before they are set, and specific causes, so try and get the four digit code numbers, the title of the code, what it means, what it takes to fix it. It should still be under warranty so I hope you don't have to pay for repairs, and maybe not even pay for the code readout. I can give you some feedback, based on the codes and the manuals that I have, as to what the causes are. But stand firm for your warranty rights.
Roland