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I own a 2013 S550 4M and love to work on cars. So I bought a project 2007 S550 with a tranny problem.
Swapped filter and oil and replaced solenoid Y3/8y1. This error was showing before but kept showing after the swap as well.
The idle still seems a little bit rough but stable. I overheated the oil to about 130 before disconnecting the fill adapter and it drained not a whole lot. 114 should be the 45 Celsius... So my mistake there.
After driving coming off the ramps took it slow but about 800 feet later the car stopped and wouldn't shift at all. I turned off the engine and restarted. Car shifted. Driving around the block but car stuttered at 1500 and wouldn't shift to 2nd. Driving a bit more, shifting manually and car started shifting to 2nd but stuttered at 2500 and wouldn't shift to 3rd. Drive around, same symptoms but over 3000 rpm acceleration good, but no upshift
Got back, pulled error codes 2810 and 0894 on the TCM. ECM of course shows 1757 1761 1765 1793.
Weirdly also, for the first time at this diag session (probably the 30th I made): 0983 and 0522.
Car was sitting in the Florida sun for 1.5 years with probably very little movement.
TCU was replaced sometimes in 2010. Now VGS3-NAG2. A003 446 03 10. Large number 3 engraved. Solenoids looked in good condition. Cleaned with magnet and flushed with ATF134 by Shell.
Any ideas?
Weird thing also, the trunk battery posts were very hot, like the whole battery, cleaned posts, tested battery, in good ahape. Just noting because voltage problems can cause TCU issues.
Thankful for any help/ideas before swapping TCU or Valve body.
Richard
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