How to Reset the Mercedes SBC Brake Counter: Fault Code C249F
Mercedes Sensotronic brake control system (SBC) uses an electronic control unit to regulate brake pressure for each wheel on models such as the E-Class W211, SL-Class R230, and CLS-Class. This system includes a counter that tracks the number of times the brakes are applied. Once the counter reaches a threshold, the driver will see a red “STOP” light on the dashboard, indicating a brake malfunction. At this point, the brake pedal may become difficult to press, and the driver should have the SBC system inspected by a qualified technician to diagnose the issue.
The counter is designed to prevent overuse of the SBC system and brake components, thereby extending their service life and maintaining vehicle safety. The hydraulic unit component of the SBC traction system has exceeded its operating time limit. Mercedes-Benz has established a cycle limit for the SBC hydraulic pump. Once this module count goes from 300,000 to 0, the instrument cluster will display one of the following errors:
• STOP VEHICLE
• SBC Control Module Failure
• REDUCED BRAKING POWER – VISIT WORKSHOP
• Brake Defective Stop Vehicle
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Troubleshooting Mercedes SBC Brake Counter Reset
The video above demonstrates how to reset the counter on the Mercedes-Benz SBC using a YOUCANIC Scanner. It is important to note that this procedure should only be performed on a rebuilt pump or an SBC that has been replaced. Attempting to reset the SBC counter on a used pump that hasn’t been rebuilt could cause brake failure during operation, creating a potentially dangerous situation.
What happens when this module fails?
Mercedes SBC is designed to provide reliable and efficient braking under normal driving conditions. However, if this system fails, it can result in serious safety issues while driving. For instance, if the system fails completely, braking efficiency during emergencies will be severely reduced, leading to longer stopping distances and an increased risk of collisions.
In addition, a total failure of the SBC system may result in a complete loss of braking, which can be catastrophic. The driver may experience a sudden and unexpected loss of braking power, making it difficult or impossible to stop the vehicle. This can be especially dangerous when driving at high speeds or in heavy traffic, where quick, precise braking is necessary to avoid collisions.
It’s important to note that regular maintenance and inspection of the SBC system can help prevent these situations from occurring. We recommend having the system inspected and serviced by a qualified technician at the recommended intervals specified by the manufacturer. This will help ensure that it functions correctly and that any potential issues are identified and addressed promptly.
Symptoms
- C249F & C2498 – The operating time of the SBC Traction system hydraulic unit’s (A7/3) component has been exceeded.
- STOP VEHICLE – REDUCED BRAKING POWER – VISIT WORKSHOP Brake Defective Stop Vehicle
- C26DE/ C26BB Hydraulic Fault -SBC Control Module Failure –
- Red Brake Light, On Dash
- The brake pedal is too hard to press
Common Causes
SBC Counter Limit Reached:
The hydraulic unit component of the SBC traction system has exceeded its operating time limit. Mercedes-Benz has established a cycle limit for the hydraulic pump. Once this module count reaches around 300,000, the instrument cluster will display one of the following errors: STOP VEHICLE, SBC Control Module Failure, REDUCED BRAKING POWER – VISIT WORKSHOP and Brake Defective Stop Vehicle.
SBC Pump Defective:
The SBC/Electro-Hydraulic Brake System Hydraulic Pump can be severely damaged, reducing braking power or even a complete loss of braking capability. This component is responsible for creating and applying pressure to the brakes. The SBC error code is commonly seen in Mercedes-Benz cars, such as the E-Class W211, SL-Class (R230), and CLS-Class. If the pump is defective, it can cause significant safety concerns, and immediate attention should be given.
Brake Light Switch
A failing brake light switch can exhibit various symptoms, one of the most noticeable being the brake light being on at all times. This issue often occurs due to a short circuit in the brake light switch, which can keep the brake lights on even when the pedal is not pressed. Over time, this can cause the brake lights to burn out and require replacement.
Weak Car Battery:
When a car battery becomes weak, it can cause several issues with the vehicle’s electrical systems, including the SBC brake system. If the SBC control module fails to receive enough voltage from the battery, it can trigger warning messages such as “REDUCED BRAKING POWER – VISIT WORKSHOP” or “Brake Defective Stop Vehicle.” This is because the pump, which generates braking pressure, does not receive sufficient voltage to operate, resulting in reduced or complete loss of braking power. If you experience any warning messages, it’s important to address them immediately and have this system checked by a qualified mechanic.
Extended Warranty
The Sensotronic Brake Control (SBC) system was installed on some models from 2003 to 2006 and has been known to have pump issues that could cause the brakes to fail.
In response to these issues, Mercedes-Benz offered an extended warranty for the SBC system, valid for up to 25 years or 250,000 miles from the original in-service date, whichever comes first.
Suppose you are experiencing issues with your SBC system. In that case, contact your local Mercedes-Benz dealership or an authorized repair center to determine whether your vehicle qualifies for the extended warranty.
