Code Definition

C1025 — BAS CAN Communication With ESP Control Module Faulty

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Mercedes-Benz

About C1025

C1025 is a manufacturer-specific chassis diagnostic trouble code recorded for Mercedes-Benz vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1025 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

On older Mercedes Benz models, the Brake Assist System (BAS) is implemented as a separate control module that communicates with the Electronic Stability Program (ESP) over the CAN bus to coordinate emergency braking interventions based on pedal apply speed and wheel speed data. Code C1025 is stored when the BAS control module detects that CAN messages from the ESP module are missing, delayed beyond a calibrated timeout, or contain implausible data. A very common Mercedes Benz trigger for this code is a failing stop lamp (brake light) switch, which can feed the BAS incorrect speed and pedal sta...

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