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TuningBot DTC Database · v4.37.15

P2B91 Turbocharger/Supercharger B Temperature Sensor Circuit High

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

P · PowertrainEngineOBD2

What P2B91 means

P2B91
Turbocharger/Supercharger B Temperature Sensor Circuit High Generic · engine Data confidence 65%

The control module detected that the signal in the Turbocharger/Supercharger B Temperature circuit stayed above 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

P2B range
P2B00P2B01P2B02P2B03P2B04P2B05P2B06P2B07P2B08P2B09P2B0AP2B0BP2B0CP2B0DP2B0EP2B0FP2B10P2B11

How to read P2B91

P

Powertrain: engine, transmission and driveline systems.

2

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

B91

Specific fault index within the subsystem.

Frequently asked questions about P2B91

What does P2B91 mean?

Turbocharger/Supercharger B Temperature Sensor Circuit High. The control module detected that the signal in the Turbocharger/Supercharger B Temperature circuit stayed above the expected operating range.

Is P2B91 generic or manufacturer-specific?

P2B91 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P2B91 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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