W221 S550 I think transmission problem
09-07-2018, 09:14 AM
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W221 S550 I think transmission problem
I parked my car at he grocery store and when I came out, the car started with no problem. It went into gear with out an issue by sound and visually via the dash. I hit the gas and the car made a mechanical scraping sort of sound and was barely moving, and it felt like I have half in neutral. Reverse was the same thing. I did not make it out of the parking lot. Now it really wont move at all when its in drive or reverse and revving the engine feels like its in neutral but with something winding up and down. If I put the car in neutral, it feels and sounds perfectly normal. No engine lights or warning indicators. I have not been able to hook up to star since its still in the parking lot. I have a feeling its something mechanical but who knows. I transmissions go on these cars but I am hoping for something easier, cheaper to fix. Could this be anything else? I dont recall seeing any fluid or smells coming from the car either.
09-08-2018, 09:55 PM
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Indy said he pulled the code and just told me its normally a death code for these and its likely it needs to go to dealer if tranny needs to be rebuilt. I did some investigating myself, not sure if it helps.
I had a chance to hook up STAR and the fault code was "0720, Mechanical Failure of component Drive Train"
The supplementary info said possible causes of fault could be Transmission output speed.
I was able to shift into D, R, N and P without and issue. I could hear it shift and see it on the dashboard and in STAR. While in D, I was able to manually paddle shift through the gears and hear them shift in 1st and 2nd but not 3-7. I think that is by default so you dont start in 3rd gear or higher. Is there any chance this is something other than the tranny itself? something connecting the engine to the tranny? I dont think this is a sensor as I could hear something mechanically wrong when it first happened.
I had a chance to hook up STAR and the fault code was "0720, Mechanical Failure of component Drive Train"
The supplementary info said possible causes of fault could be Transmission output speed.
I was able to shift into D, R, N and P without and issue. I could hear it shift and see it on the dashboard and in STAR. While in D, I was able to manually paddle shift through the gears and hear them shift in 1st and 2nd but not 3-7. I think that is by default so you dont start in 3rd gear or higher. Is there any chance this is something other than the tranny itself? something connecting the engine to the tranny? I dont think this is a sensor as I could hear something mechanically wrong when it first happened.
