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DTC codes / P22xx · Fuel and air metering (injector circuits) / P222F

P222FBarometric Pressure Sensor A/B Correlation

P222F indicates that the powertrain control module (PCM) has detected a disagreement between two barometric pressure sensor signals, typically Sensor A and Sensor B, that should normally track closely together. The PCM compares these readings during key-on or steady-state conditions and sets the code when the correlation falls outside the expected range.

SystemPowertrain
Code typeGeneric (all makes)
SeverityLow
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms.
  • Rough running or hesitation during acceleration if the faulty sensor skews the air-fuel mixture.
  • Reduced fuel economy due to incorrect altitude compensation.
  • Intermittent stalling or poor idle quality in some cases.
  • A slight loss of power, especially at high altitudes.
  • No drivability symptoms at all in many instances, with the code being the only indicator.

Common causes, most likely first

  1. Faulty barometric pressure sensor A or B, with one sensor drifting or failing outright.
  2. Corroded, damaged, or loose wiring or connectors in the sensor circuit.
  3. A restricted or clogged pressure sensor port or hose, preventing accurate pressure readings.
  4. Water intrusion or contamination in the sensor or connector.
  5. A software glitch or outdated PCM calibration causing false correlation errors.
  6. Rarely, a PCM internal fault affecting the sensor reference voltage or signal processing.

How to diagnose and fix it

  1. Use an OBD-II scan tool to read live data from both barometric pressure sensors and compare their readings at key-on and during idle.
  2. Visually inspect the sensors, connectors, and wiring for damage, corrosion, or loose pins; repair as needed.
  3. Check for technical service bulletins (TSBs) or software updates for the vehicle make and model that address false P222F setting.
  4. Test the sensor signal voltage and reference voltage with a digital multimeter (DMM) according to the manufacturer's procedure.
  5. If one sensor's reading is inconsistent, replace the faulty sensor and clear the code.
  6. Verify repair by clearing codes and performing a road test to ensure the code does not return.

Barometric sensor correlation pitfalls

  • A common oversight is replacing the barometric pressure sensor when the real problem is a clogged or disconnected pressure port or hose, which can mimic a sensor failure.
  • Some vehicles use the manifold absolute pressure (MAP) sensor to infer barometric pressure at key-on, so a faulty MAP sensor can trigger P222F even though the dedicated barometric sensor is fine.
  • The code may set intermittently due to a poor electrical connection that only acts up under certain conditions like vibration or temperature extremes, so a wiggle test of the harness is essential.
  • A low or weak battery can cause erratic sensor readings during cranking, leading to a false correlation code; always verify battery and charging system health first.
  • After replacing a sensor, some PCMs require a relearn or calibration procedure for the new sensor to be recognized correctly, which is often missed.

Can I keep driving with P222F?

The vehicle is generally safe to drive with P222F because it rarely causes immediate drivability issues, but you should avoid sustained high-speed or high-load driving until the fault is repaired to prevent potential fuel mixture errors.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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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