There is a tremendous amount in the archives on this issue that show you how to troubleshoot this issue.

Play with the search function and you should be able to find a lot of information.

My local MB mechanic tells me that 90% of the time, and upshift delay valve code is usually caused by a vacum leak in the upshift delay valve, located on the side on the transmission.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".