P00D0
Barometric Pressure - Turbocharger/Supercharger Boost Sensor B Correlation.
- 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
- D0
- FaultThe specific fault in that area
What it means
P00D0 means the engine control unit has compared the barometric pressure reading with the reading from turbocharger or supercharger boost sensor 'B' and found they do not agree within the expected limit. The comparison is usually made when there is little or no boost, such as at key-on before starting or at idle, when both sensors should read close to ambient pressure. Which sensor is 'B' and where the barometric reading comes from (a separate sensor, the control unit itself or another pressure sensor) depends on the vehicle.
Symptoms
- Engine management light on
- Reduced power or limp-home mode
- Poor or inconsistent boost response
- Hesitation or flat spots under acceleration
- Rough running or poor fuel economy
- Possible additional boost or MAP sensor codes stored
Possible causes
- Faulty or drifting boost pressure sensor B (reading out of range or slow to respond)likely
- Wiring or connector fault on the boost sensor circuit (corrosion, loose pin, chafed wire, poor reference voltage or ground)likely
- Blocked, split or disconnected hose or pipe to the sensor, or an air leak in the charge air pathpossible
- Faulty barometric pressure sensor, or a fault in the control unit's internal pressure sensor where fittedpossible
- Restricted air filter or intake duct skewing the pressure readingspossible
- Carbon or oil contamination of the sensor port or sensing elementpossible
- Outdated or faulty control unit calibration where the manufacturer has issued a known correctionrare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting engine load, speed and boost at the time the code set, and check for related MAP, boost or barometric codes.
- Visually inspect the sensor, its connector, wiring and the hose or pipe feeding it for damage, corrosion, oil contamination or poor routing.
- With the key on and engine off, compare live barometric and boost sensor B readings; both should be close to ambient pressure and to each other.
- Compare the readings against a known-good reference gauge or another pressure sensor on the engine, bearing in mind local altitude and weather.
- Check the sensor supply voltage, signal and ground with a multimeter against the manufacturer's specification, and wiggle-test the harness while watching live data.
- Inspect the air filter, intake ducting and charge air pipes, hoses and clamps for restriction, splits or leaks, and smoke test the charge air system if a leak is suspected.
- Watch both readings in live data at idle and under a road test boost load to see whether the fault is steady or intermittent.
- Check for applicable service bulletins or calibration updates for the specific model and engine before replacing the control unit.
How to fix
- Replace the boost pressure sensor B if its readings are out of range, drift or respond slowly.
- Repair or replace damaged wiring, terminals or connectors on the sensor circuit.
- Clear, refit or replace blocked, split or perished sensor hoses and pipes, and repair any charge air leaks.
- Replace a faulty barometric pressure sensor, or diagnose the control unit further if the pressure sensor is internal to it.
- Replace a restricted air filter and clean or correct any intake duct problems.
- Apply a manufacturer calibration update only where an outdated or faulty calibration is a known cause for that model.
Can I keep driving?
The car can usually be driven for a short time, but expect reduced power and poor boost control, and fix it soon. If it enters limp mode or runs badly, limit driving to avoid further problems with the engine or turbocharger.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.