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SL 350 gear selector module, manual override switch missing! Really? Why?

Phil311

New Member
Joined
Jan 24, 2024
Messages
3
Location
UK
Car
SL 350 (R230)
Hello Folks,

The old girl (an SL 350 (R230) manufactured in 2004) has been in my care for around four years now, but yesterday was the first time she misbehaved so badly that I’m now seriously considering changing her for a newer model!

To cut a long story short, the gear selector module was jammed in ‘park’ and would not budge.

What follows is a summary of the saga. Admittedly, before I set off on the brief journey of roughly two miles, the rear battery (electrical consumers) was severely discharged, and ‘red-lighted’ me with a demonic red display, instead of the typical “Electric consumers offline!” message.

On balance, I decided to take the risk of a short run, since I anticipated that the battery should get sufficient charge and all would be well, besides the MoT was due soon.
The plan was to take a slight detour, increasing the distance, thereby giving the consumer battery enough charge, for the time being.
Before moving off I had trouble selecting ‘drive’, but after a few attempts the selector did move freely and without any excessive force.
I parked up and visited the parts shop for a new tool I needed and returned to the car straight away.
The engine cranked and started perfectly, but the gear selector refused to move out of the park position. No amount of pumping the break pedal would persuade it to play ball this time!

My only option was to call an emergency service. The eventual result being that the engineer identified a little online help message (on his tablet) that required seven small Torx screws to be removed from the rubber gate in order to expose a grey or yellow tag which would release the selector. However, when the black rubber part was moved away, there was no tag visible!!

Applying the brake produced a click sound from the selector module, so it seemed obvious that the solenoid in the selector was trying to do something.

Sadly, the recovery of my immobile car was a long process, which took six hours in total! It was towed with the front wheels on a special trailer. The rear wheels were temporarily removed and freewheeling hubs and wheels were bolted on instead.

Apparently, this car does not have a manual override switch to disengage the selector. It that right?
Can anyone confirm this or perhaps let me know how it perform an emergency release, please?


If possible I want to avoid having to organize another car recovery trip to a workshop.

One relevant service history item is that the brake light switch was replaced in April 2022.
Today, I charged the consumer battery to 12.56V, yet the ‘selector stuck in park’ fault persists.

Any help with this fault will be very much appreciated.

I should mention that last night I trawled YouTube for answers and know about the anti-tamper pin above the front fixing bolt on the selector module. This makes it a specialist repair job for me.
If anyone knows of an independent Mercedes specialist located on or near the east coast of Suffolk (UK), I would be very interested to hear recommendations.

Thanks for reading!

Cheers, Phil311
 
Alex Crow in Stowmarket comes highly recommended.
 
Thanks for that info.
MB Norwich have confirmed there is NO emergency release switch on this model.
In my case the solution will be to replace the gear selector module and lament the state of the maintenance budget.
Not a great start to 2024!
 
No idea if this is the same as a 2003 S500 (no emergency release either) but I had a similar issue only with considerable force it was movable. I dismantled the selector and removed the locking catch. I forget exactly what was involved but it took a LOT less than 6 hours! Basically left it out so it can't happen again. Several years ago and it's not been an issue since. Obviously, remove a safety device at your own risk. IIRC there was a more robust aftermarket part available.
 

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