Mercedes SBC (Sensotronic Brake Control)
Mercedes SBC fault code C249F
C249F is a service message relating to the hydraulic unit’s operating time. That is different from a confirmed failure. For the offered on-vehicle counter reset, the known code can be sent while preparing the WhatsApp appointment.
At a glance
What the code tells you
Check the operating time of the SBC hydraulic unit (A7/3).
Assembly concerned: Service and counter messages
These messages concern the hydraulic unit’s operating time or service threshold. They do not automatically indicate a failed component.
What the code does not tell you
- An operating-time message is not proof that the hydraulic unit has failed.
- Fixed brake-application counts circulate online for this code. They are not stated in the diagnostic register and are therefore not reproduced here.
- The code states what the control unit reports, not which component must be replaced.
- SBC is a safety-critical braking system. A fault code alone cannot establish whether the vehicle is safe to drive.
How we approach it
We read the complete fault memory before making a decision. The offered service for C249F remains limited to the counter reset on the vehicle; we do not offer mechanical SBC repairs.
- Counter reset on the vehicle: fixed €50. Appointment exclusively by WhatsApp; send any known fault code if available.
- No mechanical repair and no mail-in service for SBC units.
- SBC is safety-critical. If the diagnosis rules out a quick fix, we will say so—even if that means losing the job.
Relevant model series
- W211 (E-Class)
- W219 (CLS)
- R230 (SL)
Codes for the same assembly
Traceable sources
Where the definition comes from
The meaning of this code comes from the SBC control unit’s diagnostic list. The manufacturer’s wording is copyright-protected, so we explain it in our own words rather than reproduce it verbatim. We do not use forum posts or sales descriptions as sources.
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