Need advice on 2003 S500 default codes Pre-safe Inactive and Check Engine.


Asked by Syed_Baghdadi786 Apr 01, 2013 at 02:48 PM about the 2003 Mercedes-Benz S-Class S500 4MATIC

Question type: Maintenance & Repair

Need advice on 2003 Mercedes S500 with default note stating "Pre-safe inactive and Check Engine light on. Problem is that the Transmission is not shifting from 2nd gear.  Note, I just tried detailing and washed the emgine compartment light.. Your help is sincerely appreciated.My e-mail addresses are: SAB3@Chrysler.Com and

4 Answers


pre sets ,or limp mode when a sensor disconnect ,failed or voltage blur like due to water in jack plugs of sensor . every thing returns after problem corrected.on a Benz I don't know if a scanner will be needed to erase code after dry out, or new sensor.or was a precondition existing? cant see a hood light having any effect even sumerged

2 out of 2 people think this is helpful.

Sorry, First of all my sincerest thanks for your advise. I will try to update this posting with my findings. I apologize for making a typo error on my question. I wrote " I washed the emgine compartment light" I actually meant, I washed the engine compartment last night. I left my S500 home and came to work in a loaner car. I hope you are right. I hope all that moisture from using the water hose will be dried off and my problem will be solved, by the time I get home tonight. My tel # is 248 760 7789, should anyone has any questions. Thank you sincerely. Syed.


I took my car this evening to Auto Zone. They check it out with the OBD2 sensor and told me: 1. Turbine speed sensor malfunction. This could be either due to poor electrical connection or due to a failed Turbine speed sensor. 2. Electrical transmission control system malfunction. This could be either due to poor electrical connection or Check powers and grounds to TCN. Although they Auto Zone sells several different sensors, they do not sell the Turbine Speed Sensor for S500. They strongly recommended me to take my car to a Mercedes dealer.


You have to get a used or new Electronic transmission module which is located in the right engine compartment fuse box attached to the fire wall.. Its a black box 5'' by 5''.. Thats your problem 100%….

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

Looking for a Used S-Class in your area?
CarGurus has 6,790 nationwide S-Class listings starting at $2,000.

Search Mercedes-Benz S-Class Questions

Mercedes-Benz S-Class Experts

#1 Tom Demyan
Tom Demyan
Reputation 470
#2 Michael Kane
Michael Kane
Reputation 400
#3 lightGear
Reputation 390
View All

Related Models For Sale

Used Mercedes-Benz E-Class"
596 Great Deals out of 23,569 listings starting at $1,999
Used BMW 7 Series"
99 Great Deals out of 4,715 listings starting at $3,595
Used Mercedes-Benz C-Class"
648 Great Deals out of 25,269 listings starting at $1,400
Used Mercedes-Benz SL-Class"
131 Great Deals out of 3,293 listings starting at $3,950
Used Mercedes-Benz CL-Class"
34 Great Deals out of 711 listings starting at $4,200
Used Audi A8"
52 Great Deals out of 2,566 listings starting at $4,588
Used Land Rover Range Rover"
127 Great Deals out of 3,638 listings starting at $3,500
Used BMW 5 Series"
373 Great Deals out of 19,668 listings starting at $2,500
Used Jaguar XJ-Series"
69 Great Deals out of 2,294 listings starting at $2,888
Used BMW 6 Series"
89 Great Deals out of 2,890 listings starting at $8,900

Used Cars For Sale

2016 Mercedes-Benz S-Class For Sale
1,555 listings starting at $164,995
2015 Mercedes-Benz S-Class For Sale
5 Great Deals out of 1,377 listings starting at $76,995
2014 Mercedes-Benz S-Class For Sale
3 Great Deals out of 258 listings starting at $68,850
2013 Mercedes-Benz S-Class For Sale
15 Great Deals out of 508 listings starting at $29,997
2012 Mercedes-Benz S-Class For Sale
6 Great Deals out of 211 listings starting at $30,995