itmek
Active Member
- Joined
- Jul 8, 2007
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- Your Mercedes
- C Class 2005 200cdi
Car – C Class Classic SE
C220 CDI 5 Speed Tip Auto
‘W’ Reg 2000 Miles 125,000
Vin – WDB 202 133 2F 961468
Intermittent Problem over the last 8 weeks.
In wet weather, loads of road puddles, the BAS ESP and ABS lights illuminate on the dash.
The car will then not change gear. The speedometer needle goes to zero and stays there even though the vehicle is moving. The car then goes into a “safety/limp” mode thereafter.
I typically pull over and park the vehicle and turn off the ignition. After several minutes I start the car and the BAS ESP and ABS lights remain on but the car drives normally.
After a lengthy parking spell (several hours) the car starts and drives normally and the BAS ESP and ABS lights go out after several minutes.
The car had a new battery fitted in March 07.
The diagnostics test indicated that there was a problem with the ABS on each of the 4 wheels.
The garage that carried out the test stated that this would be most unusual. They said that some Mercedes that they have worked on have contaminated wiring, sometimes caused by water pooling somewhere within the vehicle.
Looking at previous threads it seems there are several possible options but i am not sure which ones may apply to my car.
Possible Option 1
I understand that there is a brake light switch above the brake pedal that may have a fault but I understand that although changing this may correct the ESP BAS light problem it may not necessarily resolve ABS light problem.
Possible Option 2
I also understand for some C Class models (not sure if that includes my model) there may be water leaking into the in the fuse box causing a contaminated SAM. (Not sure what SAM is but some thing to do with the speedo?). I checked the fuse box (on a dry day) and it looked dry with no pooling of water. If a water leak in the fuse box was the cause how is it resolved?
Possible option 3
I have read that the front wheel speed sensor may be the main cause of this sort of problem – presumably only when it is wet? Also that the ESP is affected by all speed sensors. Is this a case of needing to replace some or all of the sensors?
This problem is intermittent and seems to be associated with wet conditions
Since the last episode the weather has been warm and dry over several days and the car now drives perfectly.
Also the problem does not seem to be linked to using the brakes on any other driving habits other than driving in very wet conditions.
Before I embark on getting this problem fixed I’d be grateful for any extra advice that may be offered via the forum. I will then either let my garage know about it or take it somewhere that understands the nature of the problem. As you can tell I have rather limited technical/mechanical experience.
C220 CDI 5 Speed Tip Auto
‘W’ Reg 2000 Miles 125,000
Vin – WDB 202 133 2F 961468
Intermittent Problem over the last 8 weeks.
In wet weather, loads of road puddles, the BAS ESP and ABS lights illuminate on the dash.
The car will then not change gear. The speedometer needle goes to zero and stays there even though the vehicle is moving. The car then goes into a “safety/limp” mode thereafter.
I typically pull over and park the vehicle and turn off the ignition. After several minutes I start the car and the BAS ESP and ABS lights remain on but the car drives normally.
After a lengthy parking spell (several hours) the car starts and drives normally and the BAS ESP and ABS lights go out after several minutes.
The car had a new battery fitted in March 07.
The diagnostics test indicated that there was a problem with the ABS on each of the 4 wheels.
The garage that carried out the test stated that this would be most unusual. They said that some Mercedes that they have worked on have contaminated wiring, sometimes caused by water pooling somewhere within the vehicle.
Looking at previous threads it seems there are several possible options but i am not sure which ones may apply to my car.
Possible Option 1
I understand that there is a brake light switch above the brake pedal that may have a fault but I understand that although changing this may correct the ESP BAS light problem it may not necessarily resolve ABS light problem.
Possible Option 2
I also understand for some C Class models (not sure if that includes my model) there may be water leaking into the in the fuse box causing a contaminated SAM. (Not sure what SAM is but some thing to do with the speedo?). I checked the fuse box (on a dry day) and it looked dry with no pooling of water. If a water leak in the fuse box was the cause how is it resolved?
Possible option 3
I have read that the front wheel speed sensor may be the main cause of this sort of problem – presumably only when it is wet? Also that the ESP is affected by all speed sensors. Is this a case of needing to replace some or all of the sensors?
This problem is intermittent and seems to be associated with wet conditions
Since the last episode the weather has been warm and dry over several days and the car now drives perfectly.
Also the problem does not seem to be linked to using the brakes on any other driving habits other than driving in very wet conditions.
Before I embark on getting this problem fixed I’d be grateful for any extra advice that may be offered via the forum. I will then either let my garage know about it or take it somewhere that understands the nature of the problem. As you can tell I have rather limited technical/mechanical experience.
