Fuel and air

P006D — Barometric vs. Turbo/Supercharger Inlet Pressure Sensor Mismatch

Severity: medium Drive with care, to a shop

What P006D means

The engine control module compares the barometric pressure sensor signal with the pressure sensor at the turbocharger or supercharger inlet. With the engine off, or when the intake is unloaded, the two readings should be nearly identical. When they differ by more than the allowed amount, the ECM sets a correlation fault and can no longer calculate boost and fuel mixture accurately.

Symptoms

  • Check Engine light on
  • Reduced power or sluggish acceleration
  • Higher fuel consumption
  • Hissing or odd boost-related noises
  • Rough idle or stalling

Possible causes

  1. Failed barometric pressure sensor
  2. Failed turbo/supercharger inlet pressure sensor
  3. Intake air or vacuum leaks, damaged hoses
  4. Damaged wiring or corroded, loose connectors
  5. Clogged air filter or blocked sensor port
  6. ECM software or calibration issue (uncommon)

How to diagnose

  1. Scan all codes and freeze-frame data and look for other boost or airflow codes
  2. Inspect the air filter, intake ducts, clamps and intercooler for cracks and leaks
  3. Check the connectors and wiring of both sensors for corrosion, chafing or poor contact
  4. With key on and engine off, compare both sensor readings on a scan tool; they should be close
  5. Test the 5 V reference and ground at each sensor connector with a multimeter
  6. Compare readings against a reference gauge or a known good sensor
  7. Check for an ECM software update for your model

Common fixes

  • Replace the barometric pressure sensor
  • Replace the turbo/supercharger inlet pressure sensor
  • Repair wiring and connectors
  • Seal intake leaks and replace worn hoses and clamps
  • Update or reflash the ECM per the manufacturer's bulletin

Questions and answers

What does P006D mean?

The ECM found that the barometric pressure sensor and the turbo/supercharger inlet pressure sensor disagree by more than allowed. The usual culprits are one of the sensors, wiring or an intake leak.

Can I drive with P006D?

Briefly, for example to a shop, if the engine runs smoothly. Power may be limited, so avoid long trips and heavy loads.

How do I fix P006D?

Start by inspecting the intake and the sensor connectors, then compare both readings on a scan tool. Replace a sensor only after you have ruled out wiring problems and leaks.

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.