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TuningBot DTC Database · v4.37.15

P045F Exhaust Gas Recirculation "B" Control Stuck Closed

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

P · PowertrainEmissionsOBD2

What P045F means

P045F
Exhaust Gas Recirculation "B" Control Stuck Closed Generic · emissions Data confidence 78%

The control module determined that the Exhaust Gas Recirculation "B" Control did not change state as commanded and appears stuck.

Symptoms

  • MIL illuminated
  • Possible reduced engine performance
  • Possible rough idle or hesitation

Possible causes

  • Carbon-blocked EGR passages
  • Sticking or slow EGR valve
  • EGR actuator or position sensor fault
  • Wiring or connector fault
  • Vacuum supply fault (vacuum-operated systems)

Recommended checks

  • Read freeze frame data and full module scan
  • Check battery voltage and sensor supply
  • Inspect EGR wiring and connectors
  • Compare commanded vs actual EGR position/flow with live data
  • Inspect EGR valve and passages for carbon build-up
  • Check related vacuum lines where fitted

Related and nearby codes

Related codes
P045AP045BP045CP045DP045E
P04 range
P0400P0401P0402P0403P0404P0405P0406P0407P0408P0409P040AP040BP040CP040DP040EP040FP0410P0411

How to read P045F

P

Powertrain: engine, transmission and driveline systems.

0

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

45F

Specific fault index within the subsystem.

Frequently asked questions about P045F

What does P045F mean?

Exhaust Gas Recirculation "B" Control Stuck Closed. The control module determined that the Exhaust Gas Recirculation "B" Control did not change state as commanded and appears stuck.

Is P045F generic or manufacturer-specific?

P045F is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P045F 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: EGR System

ECU tuningDyno-tested results by model and engine See the results →

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