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TuningBot DTC Database · v4.37.15

P004C Turbocharger/Supercharger Boost Control "B" Circuit Low

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

P · PowertrainEngineOBD2

What P004C means

P004C
Turbocharger/Supercharger Boost Control "B" Circuit Low Generic · engine Data confidence 85%

The control module detected that the signal in the Turbocharger/Supercharger Boost Control "B" circuit stayed below the expected operating range.

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

P00 range
P0000P0001P0002P0003P0004P0005P0006P0007P0008P0009P000AP000BP000CP000DP000EP000FP0010P0011

How to read P004C

P

Powertrain: engine, transmission and driveline systems.

0

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

04C

Specific fault index within the subsystem.

Frequently asked questions about P004C

What does P004C mean?

Turbocharger/Supercharger Boost Control "B" Circuit Low. The control module detected that the signal in the Turbocharger/Supercharger Boost Control "B" circuit stayed below the expected operating range.

Is P004C generic or manufacturer-specific?

P004C is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P004C at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

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

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