Clarification-P0500; P0720 Shift Control - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 03-09-2013, 06:02 AM Thread Starter
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Vehicle: 2000 Mercedes-Benz S500. Sold: 2000 C230K, Sold: 1997 Porsche 944S
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Clarification-P0500; P0720 Shift Control

Guys; my apology's to all, I have been gone for awhile and have not contributed. Very busy in life with lot's of drama.

I am looking for your advise.
I have the P0500 and P0720 Error Codes on my 129,000 Miles C230K.
The typical dashboard lights up like a Christmas tree. However I have found a way to keep the old gal running.
I drive for 10 Minutes, to get the Tranny warmed up real nice. Then I shut off the car for 2 full minutes then turn her on and the lights/error code go away and then I can drive normally. I've done this for a month now!!

I need to fix the problem and not just run away from the problem.
Mercedes Stealership says almost $1,000 to fix.
Indy Repairman says $600.00

From reading the Board/Forum am I understanding this correctly, the Speed Sensor, Part Number: 140-270-11-61 needs to be replaced.
Is this correct?

You know I can easily do this, drop the Tranny Pan and probably just need to unbolt the Speed Sensor Circuit?

Of course I will change out the Tranny Oil and Install new Filter. That's a gimme!

Second question: Reading the previous posts I am confused...
Is it correct I can pull the Speed Sensor Circuit Panel and use Electronic Cleaner Spray and reinstall? I will also Electronic Cleaner Spray the Connector Plug because she has Tranny Oil on the plug, too!


I can do this inexpensively but don't want to waste time and materials.

2000 Mercedes C230 Kompressor, 129,000 Miles.

New York City, NY
Richmond County

United States of America
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post #2 of 2 (permalink) Old 03-10-2013, 09:40 PM
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if you are getting speed sensor faults, you will need to replace the entire electrical circuit board on the valve body. The speed sensors are not sold separately. Just be mindfull of the position of the solenoid valves. make sure you put them back in their proper place. The torque spec for the valvebody bolts are 8 newtonmeters. while you are at it, replace the connector plug on the transmission end. Cheers!
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