Engine Controls - Harsh A/T Downshifts/'Clonk' Noise
SI B 24 04 05Automatic Transmission
JUNE 2005
Technical Service
SUBJECT
Harsh Downshift or "Clonk" Noise on Deceleration
MODEL
E65/66; 745i/745iL with 6HP26 from 09/03 up to 02/05.
SITUATION
Customer may complain of the following:
^ An excessively harsh downshift when decelerating to a stop, or
^ A "clonk" noise from the transmission when decelerating to a complete stop.
CAUSE
EGS software.
CORRECTION
On a customer complaint basis only, reprogram/recode complete vehicle using SSS with CIP on-line update 17.01, or higher.
Important:
Transmission temperature must remain below 50 deg. C prior to the start of CIP programming.
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
For the appropriate defect code and labor operation, refer to the KSD system.
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