P2228 — Barometric Pressure Sensor A Circuit Low

P2228: Barometric Pressure Sensor A Circuit Low — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Barometric Pressure Sensor A Circuit Low. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Illumination of the check engine light
  • Engine hesitation during acceleration
  • Degraded fuel efficiency
  • Difficult engine starting
  • Unstable idle or rough engine operation

Possible causes

  • Internal failure of the Barometric Pressure sensor
  • Internal electronic fault within the PCM
  • Inadequate power supply to the PCM
  • Corroded or damaged PCM ground connections
  • Insufficient battery voltage

What to check

  • Clear existing diagnostic codes and perform a vehicle self-test to verify the fault persistence
  • Scan for secondary diagnostic codes to identify broader electrical system issues
  • Inspect the battery and ground connections for signs of corrosion or poor contact before proceeding
  • Verify proper voltage supply to the PCM unit
  • Replace and program the PCM if the error remains after verifying electrical integrity

Also written as: P2228-00, P222800 (some scan tools add the fault-type byte, e.g. -00).