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C0021
Brake Booster Performance
Generic · chassis
Data confidence
65%
The control module judged the Brake Booster behaviour implausible for the current operating conditions.
TuningBot DTC Database · v4.37.14
C0021 Brake Booster Performance
Generic (OBD-II) interpretation in the TuningBot DTC database.
What C0021 means
Related and nearby codes
How to read C0021
C
Chassis: brakes, steering and suspension.
0
Generic SAE-standard code: same meaning on every make.
021
Specific fault index within the subsystem.
Frequently asked questions about C0021
What does C0021 mean?
Brake Booster Performance. The control module judged the Brake Booster behaviour implausible for the current operating conditions.
Is C0021 generic or manufacturer-specific?
C0021 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove C0021 at file level?
Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether C0021 is removable in your case.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic