SBC Help
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MBWorld Fanatic!
Joined: Jan 2007
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From: Usa
mgLipGD
SBC Help
Had a friend hook me up to STAR since I have the "BRAKE Visit Workshop" error showing in grey.
From the quick test these are the codes I have printed, just listing SBC faults:
P20B7-008: SBC low- voltage, check current and voltage. No control module defective P1999
P20E2: Unauthorized ambient condition for SBC request for idle speed increase
C2131: Pressure reservoir faulty (I sure the above is not as important as this so looks like new reservoir or whole new SBC unit)
I assume taking to the dealer won't help me much but just gathering more info before I try the dealer for possible warranty work, car is a 2005.
From the quick test these are the codes I have printed, just listing SBC faults:
P20B7-008: SBC low- voltage, check current and voltage. No control module defective P1999
P20E2: Unauthorized ambient condition for SBC request for idle speed increase
C2131: Pressure reservoir faulty (I sure the above is not as important as this so looks like new reservoir or whole new SBC unit)
I assume taking to the dealer won't help me much but just gathering more info before I try the dealer for possible warranty work, car is a 2005.
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From: Houston
2003 W211 E55, 2003 W220 S600
10 years 100000 mile warranty on all SBC cars.
Take it in and say the brakes feel like they are not working. Dont try to get into too much technical detail with the SA.
Take it in and say the brakes feel like they are not working. Dont try to get into too much technical detail with the SA.
Senior Member
Joined: Nov 2012
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From: Houston, TX
2006 E55
Correct. Pressure reservoir is not covered. I had to replace mine a couple months ago when I got the same reservoir fault code. It can be replaced by yourself if you like fairly easily.
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E55, SL63, ML550
Easy to replace mentioned above. If memory serves me right a 17mm wrench. Screw off and screw on. Be sure to deactivate SBC. Also a bleed is needed after , with Sds. Be sure to perform a test of the reservoir after or the code may remain current.
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MBWorld Fanatic!
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From: DownEast Maine
CLS 55 AMG E500 ML320
I wondered about that. Doesn't it say HIGH PRESSURE DO NOT REMOVE!
So you just unscrew it anyway, No big deal?
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From: 'Merica
'04 E55 (Gone but not forgotten), '13 C63 P31 (RIP), another '13 C63 PP
IIRC if you unplug your SBC cable, it won't pressurize when you open the car/start the car like normal. That's usually what that pump noise is when you first get into your car in the morning.
Junior Member
Joined: May 2023
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S211 E320 4-matic
I get the P20B7-008 code: "High idle speed due to SBC undervoltage Check the current and voltage in the vehicle No faulty control unit".
No other codes which are related to SBC. No braking issues either.
I do have some transmission issues and codes but I don't think they are related.
Should I check the voltage and current of the SBC or just of the batteries?
How would I check the voltage and current of the SBC?
Thanks in advance
No other codes which are related to SBC. No braking issues either.
I do have some transmission issues and codes but I don't think they are related.
Should I check the voltage and current of the SBC or just of the batteries?
How would I check the voltage and current of the SBC?
Thanks in advance
Junior Member
Joined: May 2023
Posts: 54
Likes: 5
S211 E320 4-matic
Thanks. I will check with my MB workshop.
My car is 20 years old. Would be great if it is still covered under warranty.
Still curious:
- How would I test the voltage?
- What would be the symptoms of a bad SBC?
My car is 20 years old. Would be great if it is still covered under warranty.
Still curious:
- How would I test the voltage?
- What would be the symptoms of a bad SBC?
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Joined: May 2022
Posts: 1,917
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From: The Netherlands
2005 CLS55 AMG W219 C219
I have a 2005 CLS55 and mine was replaced under warranty earlier this year. You need to get it checked out by an official MB dealer, they will inspect according to some script to see if it falls under warranty.
I got these warnings first: https://mbworld.org/forums/c219/8443...ml#post8651162
And then I forgot about it, then on the highway doing 60 the assisted brake was gone (scary!). I do not recommend this experience
I got these warnings first: https://mbworld.org/forums/c219/8443...ml#post8651162
And then I forgot about it, then on the highway doing 60 the assisted brake was gone (scary!). I do not recommend this experience
