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TuningBot DTC Database · v4.37.14

C05BF Brake Booster Motor B Position Sensor Supply Circuit Range/Performance

Generic (OBD-II) interpretation in the TuningBot DTC database.

C · ChassisEngineOBD2

What C05BF means

C05BF
Brake Booster Motor B Position Sensor Supply Circuit Range/Performance Generic · engine Data confidence 65%

The control module judged the Brake Booster Motor B Position Sensor Supply signal implausible: it stayed inside electrical limits but did not match the value expected for the current operating conditions.

Symptoms

  • Possible reduced power or limp mode
  • MIL illuminated
  • Possible abnormal turbocharger noise

Possible causes

  • Turbocharger actuator or position sensor fault
  • Sticking variable geometry mechanism
  • Charge-air or vacuum leak
  • Wiring or connector fault

Recommended checks

  • Compare specified vs actual boost with live data
  • Check actuator movement over the full range
  • Check hoses and vacuum lines
  • Inspect wiring and connectors

Related and nearby codes

How to read C05BF

C

Chassis: brakes, steering and suspension.

0

Generic SAE-standard code: same meaning on every make.

5BF

Specific fault index within the subsystem.

Frequently asked questions about C05BF

What does C05BF mean?

Brake Booster Motor B Position Sensor Supply Circuit Range/Performance. The control module judged the Brake Booster Motor B Position Sensor Supply signal implausible: it stayed inside electrical limits but did not match the value expected for the current operating conditions.

Is C05BF generic or manufacturer-specific?

C05BF is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove C05BF 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 C05BF is removable in your case.

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