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TuningBot DTC Database · v4.37.15

C004C Brake Booster Motor A Position Sensor Exceeded Learning Limit

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

C · ChassisEngineOBD2

What C004C means

C004C
Brake Booster Motor A Position Sensor Exceeded Learning Limit Generic · engine Data confidence 65%

The control module detected that the monitored Brake Booster Motor A Position value exceeded the calibrated threshold.

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

C00 range
C0001C0002C0003C0004C0010C0011C0012C0014C0015C0016C0018C0019C001AC001CC001DC001EC0020C0021

How to read C004C

C

Chassis: brakes, steering and suspension.

0

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

04C

Specific fault index within the subsystem.

Frequently asked questions about C004C

What does C004C mean?

Brake Booster Motor A Position Sensor Exceeded Learning Limit. The control module detected that the monitored Brake Booster Motor A Position value exceeded the calibrated threshold.

Is C004C generic or manufacturer-specific?

C004C is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove C004C 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 C004C is removable in your case.

Other file services

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

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