A/T - Momentary Slip 1-2 & 2-3 Upshift At Cold Start

Date: May 8, 2009

Order No.: S-B-27.00/115

Supersedes:

Group: 27

SUBJECT:
All Models Equipped with 722.9 NAG2 (7G-Tronic) Transmission

Momentary Slip 1-2 and 2-3 Upshift at Cold Start (First Shift Process of the Day)

If you receive customer reports in the above model vehicles of a momentary slip 1-2 and 2-3 upshift at cold start, during the first shift process of the day, the cause may be that the filling of the B1 and K1 pistons is not complete at cold start. As a result, the applied pressure must be built up and the first shift may not be optimized. Currently a software solution is in development, replacing hardware will not resolve the concern.

Note:
Do not perform any repairs for this topic until the optimized software is available.