SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: TCM issues

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Old Nov 13, 2025 | 02:38 AM
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mstuart10006's Avatar
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2004 sl500 and 1999 slk 230k
TCM issues

[img alt="Hi all
HELP
Can anyone shed some light on what is going on with these fault codes.
Car was fine when I garaged it 2 weeks ago now ive taken it out of the storage im faced with car jumps forward when D is selected and erratic gear changes.
"]https://cimg9.ibsrv.net/gimg/www.mbworld.org-vbulletin/900x2000/screenshot_20251111_160801_whatsapp_f75f8c97dbbf78 2c9d0d7980fc46894d1979bfba.jpg[/img]
Hi all HELP Can anyone shed some light on what is going on with these fault codes. Car was fine when I garaged it 2 weeks ago now ive taken it out of the storage im faced with car jumps forward when D is selected and erratic gear changes.


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Old Nov 13, 2025 | 08:05 AM
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'03 SL55 Black, '03 SL500's Aegean, Mars Red, Tazanite, Alabaster, '11 S550 Flint Gray
Which transmission? If it is a 722.6, check the TCM for transmission fluid. Fluid can wick along the wiring and flood the module.
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Old Nov 13, 2025 | 08:57 AM
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2004 sl500 and 1999 slk 230k
TCM issue

Originally Posted by MikeJ65
Which transmission? If it is a 722.6, check the TCM for transmission fluid. Fluid can wick along the wiring and flood the module.
Hi Mike
Thank you for your reply.
its the 722.9 7 speed box from my 2004 sl500
Im trying to work out if all the faults lead back to one common denominator as you sugested.
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