Fuel and air

P00D0 — Barometric Pressure vs. Boost Sensor B Correlation Fault

Severity: medium Drive with care, to a shop

What P00D0 means

The engine control unit compares the barometric pressure sensor with boost pressure sensor B when the turbo is not building pressure, such as key-on or idle. Both should read close to atmospheric pressure. If the difference is too large, the ECU sets P00D0 because it can no longer calculate boost and fueling accurately.

Symptoms

  • Check Engine light on
  • Reduced power and sluggish acceleration
  • Worse fuel economy
  • Hesitation or stumbling under throttle
  • Rough idle
  • Limp mode with little or no boost

Possible causes

  1. Failed boost pressure sensor B
  2. Failed barometric pressure sensor (or one built into the ECU)
  3. Open, short or corroded wiring and connectors at the sensor
  4. Intake or boost hose leaks
  5. Clogged air filter or restricted intake
  6. Rarely, ECU software fault

How to diagnose

  1. Scan for codes and freeze-frame data, and note any other boost or airflow codes
  2. With key on and engine off, compare barometric and boost sensor B readings on a scan tool; they should be nearly equal
  3. Inspect sensor connectors and wiring for corrosion, chafing or oil contamination
  4. Test the 5 V reference, ground and signal circuits with a multimeter
  5. Inspect the air filter, intake ducts, intercooler piping and vacuum hoses for leaks or cracks
  6. Compare readings against a known-good sensor or reference gauge
  7. Check for available ECU software updates for the vehicle

Common fixes

  • Replace boost pressure sensor B
  • Replace the barometric pressure sensor if it is a separate part
  • Repair wiring or clean/replace the connector
  • Fix leaks and replace damaged intake hoses
  • Replace a clogged air filter
  • Update or reflash the ECU if the manufacturer offers it

Questions and answers

What does P00D0 mean?

It means the barometric pressure sensor and boost sensor B give readings that should match but don't. The ECU may limit power because it can't trust the data.

Can I drive with code P00D0?

Short, careful trips to a shop are usually fine. Driving long term can lead to power loss, poor fuel economy and unstable turbo operation.

How do I tell a bad sensor from a wiring problem?

Compare both sensor readings with the engine off, then check reference voltage, ground and signal at the connector. If the supply is good but the reading is wrong, the sensor is at fault; unstable voltage points to wiring or connectors.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.