P00B0
Turbocharger/Supercharger Boost Control B Module Performance.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 0
- AreaFuel and air metering, auxiliary emission controls
- B0
- FaultThe specific fault in that area
What it means
P00B0 means the engine control unit has found a performance problem with boost control module B, a separate module or driver circuit that operates the turbocharger or supercharger boost actuator. The control unit saw the module's response, feedback or communication not matching what it commanded. Which actuator 'B' refers to, and whether it is a separate physical module, depends on the model and engine.
Symptoms
- Engine warning light on
- Loss of power or reduced boost, often with the engine in limp mode
- Turbo lag or sluggish acceleration
- Surging or uneven boost on acceleration
- Possible whistling or unusual turbo noise
- Possible increase in fuel consumption
Possible causes
- Wiring or connector fault between the engine control unit and the boost control module or actuator (chafing, corrosion, loose pins)likely
- Boost actuator or turbo control mechanism sticking or slow, for example from carbon build-up or mechanical wearlikely
- Low or unstable supply voltage or poor earth to the boost control modulepossible
- Boost leak, such as a split hose, loose clamp or leaking intercooler, so boost does not match the commanded valuepossible
- Faulty boost control module B or actuator electronicspossible
- Outdated or faulty engine control unit software or calibration, where the manufacturer has a known issue for that enginerare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting engine load, speed, boost and temperature when the fault set.
- Check for related codes, such as other boost, actuator, communication or voltage faults, and deal with those first.
- Inspect the wiring, connectors and earths at the boost control module and actuator for damage, corrosion, heat damage or water ingress.
- Check battery condition and charging voltage, then check the supply and earth at the module against the model's wiring diagram.
- Visually inspect the charge air pipes, hoses, clamps and intercooler for splits, oil residue or loose joints, and smoke or pressure test for leaks if needed.
- Check actuator movement by hand where accessible, and by commanded test using a scan tool's actuator tests, looking for sticking, slow or incomplete travel.
- Compare actual and requested boost on a road test using live data, and check the actuator position feedback.
- Check for software updates or technical bulletins for the specific engine and model.
How to fix
- Repair or replace damaged wiring, connectors or earths in the boost control circuit.
- Clean, free off or replace a sticking boost actuator or turbo control mechanism, following the manufacturer's procedure.
- Repair charge air leaks by replacing split hoses, refitting clamps or replacing a leaking intercooler.
- Correct charging or battery faults that cause low or unstable supply voltage.
- Replace the boost control module or actuator if it is confirmed faulty, then carry out any required adaptation or calibration.
- Update the engine control unit software where a known calibration fault applies to the vehicle.
Can I keep driving?
The car can usually be driven gently for a short time, but it will probably have reduced power and may be in limp mode. Get it checked soon, as continued driving with poor boost control can stress the turbo and engine.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.