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TuningBot DTC Database · v4.37.15

C056A Brake Booster Pressure Sensor Power Supply Circuit

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

C · ChassisEngineOBD2

What C056A means

C056A
Brake Booster Pressure Sensor Power Supply Circuit Generic · engine Data confidence 65%

The control module detected improper operation of the Brake Booster Pressure Sensor Power Supply circuit.

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

C05 range
C0500C0501C0502C0503C0504C0505C0506C0507C0508C0509C050AC050BC050CC050DC050EC050FC0510C0511

How to read C056A

C

Chassis: brakes, steering and suspension.

0

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

56A

Specific fault index within the subsystem.

Frequently asked questions about C056A

What does C056A mean?

Brake Booster Pressure Sensor Power Supply Circuit. The control module detected improper operation of the Brake Booster Pressure Sensor Power Supply circuit.

Is C056A generic or manufacturer-specific?

C056A is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove C056A 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 C056A is removable in your case.

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Understand the system behind this code: Diagnostic Strategy and DTC Logic

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