ZaneR

ZaneR's Avatar
ZaneR , Today 08:18 PM
Newbie
Hello everyone I am new to this forum as well as being a new Mercedes Benz owner. I recently purchased a 2007 mercedes benz s550 used. Not long after I purchased the car actually after I drove it home and parked it the next day I got in the car to take it out and a message popped up on the dash saying esp and abs is unavailable. I turned the car of and turned it back on again and it went away. Put the car in drive and drove off with no problems. This has happened a couple of more times and I found that putting the car in neutral and letting the car roll a little would make the light go away and car would drive normal. One day when I parked the car with the car still on the car was moving on the gps screen and my mileage was actually going up with the car in park. So I did some research and found that wheel speed sensors can cause this problem sometimes. Ordered all four new wheel speed sensors but before I could change them driving the car one day I kind of got on it to pull out in traffic and the car felt like it got sideways in the rear and the transmission like automatically downshifted itself and slowed down the car. After that I made it maybe a block and the transmission just stopped pulling as if the car was in neutral. I pulled over and tried turning the car off and back on but no luck. Now the car seems to be stuck in neutral even though the gear selector is moving the indicator on the dash. Only gear that seems to work correctly is park. I had the car towed home on a roll back and changed all four wheel speed sensors when I received them. The car is still doing the same thing. It wont move. Any help greatly appreciated as I am new to owning a Mercedes.Put the car on an autel scanner and came up with a c103, 1709 and 2805 fault codes. Thanks in advance.

Cuzzo

Sounds like your ism..
https://mechvibesblog.com/intelligent-servo-module/

ZaneR

Thanks Cuzzo that's what I was thinking but on the diagnostic scan it said there were 3 faults in the transmission control module and the ism module passed with no faults?

ZaneR

This is the diagnostics from the second scan.

ZaneR

This is the diagnostics from the first scan.

ZaneR

Under the first cause of the ism module not working correctly it says a bad fuse or relay.. Do you know where the fuse and relay for the ism module is located?

konigstiger

Need to have someone with MB diagnostics do quick test, best case scenario may need to be re-calibrated.

ZaneR

Thanks koingstiger we recalibrated and re adapted what we could with the autel. I am in the process of trying to find someone with a star scanner to put it on but that's easier said than done. Do you know if I purchased an icar soft scanner if that would allow me to dive deeper into the car like the star scanner would? Meaning I would be able to look into more info on the car than with the autel?

Cuzzo

For the fuses

https://fuse--box-info.cdn.ampprojec...rom%20%251%24s

If you can find someone with a star would be better...which autel do you have?
I have the autel im608 it does a good job..
The first scan had a detailed explanation of codes which pointed to the ISM. Might need recalibrating or replaced. You seem to have a ETC issue.
I current have to replace my transmission control module (tcm).

ZaneR

Thanks Cuzzo I believe it's an autel mx 808. I will check the fuses when I get back by the car. I really appreciate the fuse diagram

konigstiger

Also, MB Diagnostics is required if ISM (no associated fuse) needs replacement.

Chris Lamb2

im having the same issue they first said i need a conductor plate but now they say i need a whole new transmission at 134k miles. my w126, they just dont make them like that anymore

ZaneR

Chris lamb2 let me know if you make any progress on your end. I'll do the same when I get to work on my car.