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TuningBot DTC Database · v4.37.15

C05AF Brake Booster Motor B Current Sensor Circuit Range/Performance

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

C · ChassisEngineOBD2

What C05AF means

C05AF
Brake Booster Motor B Current Sensor Circuit Range/Performance Generic · engine Data confidence 65%

The control module judged the Brake Booster Motor B Current 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 C05AF

C

Chassis: brakes, steering and suspension.

0

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

5AF

Specific fault index within the subsystem.

Frequently asked questions about C05AF

What does C05AF mean?

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

Is C05AF generic or manufacturer-specific?

C05AF is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove C05AF 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 C05AF is removable in your case.

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