hi guys, I have a 2000 s500 Mercedes Benz that would not turn over. I determined that the SAM module and EGS on the passenger side have water damage. I have replaced both the modules with used ones with same part numbers. the car now starts up and runs! However now the car is stuck in park and will not go into gear.. my brake lights are working so I dont think it's the switch.. does the new SAM or EGS need to be reprogrammed? thanks!

did this car run ok right before the water damage or did you buy the car damaged and don’t know it’s hitstory ?

Stuck in park is usually a completely different issue it’s a. Broken plastic piece inside the shifter

Thanks for the response! I purchased the car with the no start problem. However I was able to drive it home the first day by turning the key to run position taking out the starter fuse relay and jumping it with a paperclip. the car started up and allowed me to shift into drive fine. it was just in limp mode the whole way home. so I dont think it's the actual shifter..

ok I started messing with the electronic steering wheel. it doesnt always go down very well. I'm getting the entrance position do not drive message with quite a few short beeps when I start it. still stuck in park.

The W220 is very sensitive to battery performance, and a really good, correctly-sized battery is necessary to prevent odd problems.
There are numerous resets that need to be performed after the battery goes dead or is disconnected.
Start by running the engine and turning the steering wheel from lock to lock in both directions.
Lower the driver's window completely, holding the switch down for three or four seconds after the window stops. Raise it all the way, again holding the switch after it stops.
Repeat on each of the other windows.
Repeat on the sunroof.
Repeat on each seat.
Repeat on the steering wheel.
While not every one of these might be necessary, it only takes a few minutes to complete them. The computer needs to learn where the end of travel is on most of these.

The stuck shift lever may or may not be helped by the resets. The broken plastic lever in the shifter is a very common problem. While it is within the capabilities of a reasonably competent DIY owner to remove or replace the broken lever, you need to be aware that the shifter is one of the four "theft-relevant" assemblies, and if you damage it beyond repair, you will have to replace it, the EIS, the ECU and the keys. ($$$) There are many descriptions and videos online on doing the repair, so know what you are doing.

It's the connections to the passenger SAM relay and egs are green and corroded from water damage. I tried to clean them but failed. the car was doing all kinda funny things. . looks like fun trying to replace? maybe a cut and splice? any ideas thanks!

I suggest you use some 100% white vinegar to remove the corrosion, followed by distilled water rinse, then soda-ash water--to neutralize the acid completely, Then use STABILANT-22 on the connection surfaces. Stabilant-22 works!!! and will restore good connection. Stabilant-22 is not cheap, but it IS REAL and DOES WORK better than anything else.

Is this a possible CPS symptom for replacement?

Scott

No. CPS has no effect whatsoever on whether or not the starter works, or the gearshift works. The only effect that the CPS has is that you get one of three conditions: The engine runs fine; the engine refuses to run intermittently; or the engine refuses to run.

with a bad cps the car will crank but will not start , usually just when the car is warm. Let it cool off and it’s fine . Does not affect shifting