code c2131 pressure reservior faulty - Mercedes-Benz Forum

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post #1 of 6 (permalink) Old 01-12-2010, 03:26 PM Thread Starter
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code c2131 pressure reservior faulty

My 2004 E320 just got serviced by independent MB mechanic, and I was told that there is a possible problem with SBC braking system. Does anyone know what code C2131 means ? Does it mean just pressure reservoir faulty ? How does it linked to SBC ?
There was message 'Brake visit workshop'. Mechanic replaced the rear and told me the front ones are fine. Today, I got this in RED, 'Brake, increased braking distance/reduced braking ... visit workshop.. flashing words.

Will replacement SBC module will solve all problem ? I mean the message in Red..Please HELP !!

2004 E320 70K
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post #2 of 6 (permalink) Old 01-12-2010, 08:32 PM
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Most of the SBC system is under a ten year warranty campaign. I would get to a dealer at the
soonest possible time.
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post #3 of 6 (permalink) Old 01-12-2010, 09:27 PM
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More than likely the mechanic botched the brake work. The SBC system has a high pressure accumulator that stores pressures to apply the brakes. If the mechanic wasn't careful the system could have jammed a check valve open preventing the accumulator from holding pressure.

The system is relatively simple but you had better know what you are doing before working on these brakes.

You may only need a pressure bleed followed by an SBC accumulator pressure check, of course only somebody with STAR or a dealership can do this.
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post #4 of 6 (permalink) Old 01-15-2010, 08:13 PM Thread Starter
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I took the car to the dealer. It was under warranty (10 yr), and they replaced control module. All Red alert of braking distance..Gone.. It runs just fine now. Thank you.. =)

2004 E320 70K
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post #5 of 6 (permalink) Old 12-13-2011, 02:56 PM
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I had the same problem with the Red Dash saying "Stop Car Visit Workshop". From reading forums, I thought it to be the SBC pump that was under warranty. Well, the dealership said it was the SBC Pressure reservoir and not the pump for 1200 bucks of course. On Friday they told me if it WAS the pump, I'd have the Red Dash and no brakes. I told them that's what it is! They say the pump is not coding but the reservoir is. I just got off phone to complain to MB corporate. The dealer won't just replace the pump because the computer says it's the reservoir and not the pump. But the tech said the Red Dash warning would only come on if pump failed. I've had the brake malfunction on for two years and never the red dash code on until lately.
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post #6 of 6 (permalink) Old 11-08-2015, 12:01 PM
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Exclamation E-Class SBC 10 Year Warranty loop hole

have read on many forms that people that have the SBC system are having lots of problems with the dealers warrantying the SBC System. It seems that that the Mercedes Warranty division has created a loop hole in order to avoid repairing the SBC system for freeeeee during the 10 year warranty period. If you think your carís SBC system still has some of the 10 year warranty. Call your local dealer to confirm.

If you still have warranty the service advisers will always have the tech scan your SBC system to see if itís just a software update or if it needs a new reservoir and in most cases its just the reservoir and the software update. Then they will turn around and tell you that reservoir is not covered under the 10 year warranty. Itís going to cost you about 1300.00 dollars for repairing the reservoir, and if you just want the BOSH reservoir part itself last time I checked it had dropped down from 700.00 to 500.00 dollars at the dealer.
For those of you that might still have warranty call the dealer to confirm. If you do, before taking the car in, buy a scan tool on Amazon or ebay and scan the SBC system on your own. I found one for around 130.00
Checks to see if you get code C2131 and Code C249F, if these are the only codes you retrieve you need to damage the motherboard on the SBC system itself. Otherwise the dealer is going to charge you just for changing the reservoir and updating the software, the cost for that is around 1300.00.
The C249F is a software update that the SBC system need in order tell the SBC system how much life it has left. You can set life cycle to 25%, 50%, 75% or even 100%. The scan tool I used is the AUTEL EBS301 SBC Scan tool. This tool will automatically calculate the new miles as when the SBC light well come on the next time. Also note if the dealer wants to be a dick with you, they can set the life cycle to 25% just enough so the right RED light comes back on again and recharge you more in the near future. They can easley calculate this by the how long you have owned the car and how much mileage you have driven it.
Good luck and donít get pried off.
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