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TuningBot DTC Database · v4.37.15

P25B4 Turbocharger/Supercharger Wastegate A Stuck Closed

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

P · PowertrainEngineOBD2

What P25B4 means

P25B4
Turbocharger/Supercharger Wastegate A Stuck Closed Generic · engine Data confidence 65%

The control module determined that the Turbocharger/Supercharger Wastegate A did not change state as commanded and appears stuck.

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

P25 range
P2500P2501P2502P2503P2504P2509P250AP250BP250CP250DP250EP250FP2511P2512P2513P2514P2515P2516

How to read P25B4

P

Powertrain: engine, transmission and driveline systems.

2

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

5B4

Specific fault index within the subsystem.

Frequently asked questions about P25B4

What does P25B4 mean?

Turbocharger/Supercharger Wastegate A Stuck Closed. The control module determined that the Turbocharger/Supercharger Wastegate A did not change state as commanded and appears stuck.

Is P25B4 generic or manufacturer-specific?

P25B4 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P25B4 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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