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DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P00D0

P00D0Barometric Pressure - Turbocharger/Supercharger Boost Sensor B Correlation

P00D0 indicates that the powertrain control module (PCM) has detected a correlation problem between the barometric pressure (BARO) sensor and the turbocharger or supercharger boost sensor B. The computer compares the expected barometric pressure reading, typically taken at key-on or during certain operating conditions, with the actual boost pressure reported by sensor B and flags the code when the two signals deviate beyond a calibrated threshold.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms.
  • Reduced engine performance or a lack of boost, leading to sluggish acceleration.
  • Poor fuel economy or unusual shifting patterns as the PCM adjusts fueling and boost control.
  • Intermittent hesitation or stumble during acceleration.
  • In some cases, the engine may enter limp mode to protect the turbocharger or supercharger.

Common causes, most likely first

  1. Faulty barometric pressure sensor or its wiring/connector.
  2. Faulty boost pressure sensor B or its wiring/connector.
  3. Leaks or restrictions in the boost pressure sensor B vacuum/pressure hose or intake tract.
  4. Corrosion or damage to the sensor reference voltage or ground circuits.
  5. PCM software calibration issue or internal PCM fault.
  6. Extreme altitude or weather conditions causing a temporary out-of-range correlation (rare).

How to diagnose and fix it

  1. Perform a visual inspection of the BARO sensor and boost sensor B, including connectors and hoses, for damage or disconnection.
  2. Use a scan tool to read live data for BARO and boost sensor B at key-on, engine-off (KOEO) and compare readings; they should be close to each other and to actual atmospheric pressure.
  3. Check the boost sensor B hose for leaks, blockages, or cracks, and repair or replace as needed.
  4. Measure reference voltage (typically 5V) and ground at both sensors; repair wiring faults if voltage is incorrect.
  5. If readings are inconsistent, swap the BARO sensor with a known-good unit (if accessible) and recheck live data.
  6. Clear the code and perform a road test to verify the repair; if the code returns, follow the manufacturer's diagnostic flow chart for sensor correlation.
  7. As a last resort, reprogram or replace the PCM if all other components and circuits test good.

Key checks before replacing sensors

  • A common oversight is assuming the boost sensor is at fault when the BARO sensor is actually skewed, so always compare both sensors' readings at key-on, engine-off.
  • Boost sensor B is often the sensor located after the throttle body or in the intake manifold, while sensor A may be before the turbo; misidentifying the sensors leads to unnecessary replacements.
  • A dirty or contaminated boost sensor B can cause correlation errors without setting a circuit code, so cleaning the sensor element may resolve the issue.
  • The PCM may use the BARO reading to calculate expected boost, so a failing BARO sensor can set P00D0 even if the boost sensor is functioning correctly.
  • Extreme altitude changes during driving can temporarily set this code, but it should not reappear under stable conditions; if it does, a real fault exists.

Can I keep driving with P00D0?

You can generally continue driving with P00D0, but avoid heavy acceleration or towing until the fault is diagnosed, as incorrect boost control may lead to reduced performance or potential damage to the turbocharger over time.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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