A8L V8-4.2L (BFM) (2004)
Control Module: Customer Interest
A/T - Chirp/Hoot/Squeak On 3-4 Shift
37 Chirping, hooting, squeaking noise when shifting between 3-4
37 10 02
2013023/9
April 30, 2010.
Supersedes Technical Service Bulletin Group 37 number 08-17 dated December 16, 2008 for reasons listed below.
Affected Vehicles
Condition
^ Noises: Chirping, hooting, squeaking when shifting up and down 3-4; 4-3.
^ Vibrations: Shudder during the control phase of the torque converter clutch.
Technical Background
The torque converter clutch briefly generates (about 500 ms) noises or vibrations/shuddering when changing gears.
Note:
This only applies to vibrations/shuddering during the control phase of the converter control/converter close.
This converter condition can be checked in MVB 007/3 (converter open/converter control closed).
Production Solution
Optimized ATF (blue) introduced gradually in production years 2005 and 2006.
Service
SVM Update Instructions
1. Follow all instructions in the attached TSB 2011732 00 Software Version Management (SVM), operating instructions.