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Home / DTC / P2226 — Barometric pressure sensor

P2226 — Barometric pressure sensor

Detailed page for trouble code P2226.

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P2226

MITSUBISHI P — Powertrain

Barometric pressure sensor

Brand: MITSUBISHI
Type: P — Powertrain
AI status
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Page language: EN

Causes

  • Faulty barometric pressure (BARO) sensor
  • Open, shorted, or corroded wiring/connectors to BARO sensor
  • Poor sensor reference voltage or ground
  • Vacuum or intake leaks affecting pressure readings
  • Faulty MAP or related sensor providing conflicting data
  • Intermittent ECU input or ECU malfunction

Symptoms

  • Malfunction Indicator Lamp (MIL) ON
  • Poor idle or rough running
  • Reduced engine power or limp mode
  • Hard starting or poor cold start behavior
  • Incorrect fuel trims or higher fuel consumption
  • Boost control/turbo anomalies on turbocharged engines

What to check

  • Read freeze frame and live data with a capable scan tool; note BARO, MAP, and intake manifold pressure values
  • Compare BARO reading to local ambient barometric pressure (weather station) and to MAP with engine off (values should match)
  • Check for related codes (MAP, IAT, ECM) and multiple occurrences
  • Visually inspect sensor, harness, and connector for damage, corrosion, or water intrusion
  • Measure sensor supply (usually 5 V reference) and ground with ignition ON
  • Backprobe signal wire and verify voltage range at key ON and while running

Signal parameters

  • Typical BARO absolute pressure: ~70–110 kPa (varies with altitude and weather)
  • Expected BARO sensor signal voltage typically ~0.5–4.5 V proportional to pressure (manufacturer-specific)
  • Sensor reference: stable 5 V supply (check for 4.8–5.2 V)
  • Signal should match MAP value with engine OFF (no intake vacuum)
  • Rapid, erratic changes or a locked voltage (stuck high/low) indicate a sensor/wiring fault

Diagnostic algorithm

  1. Retrieve and record all stored codes and freeze-frame data. Note BARO, MAP, and ambient pressure values.
  2. With ignition ON (engine OFF), monitor BARO signal voltage. Confirm 5 V reference and ground at the connector.
  3. Compare BARO reading to local atmospheric pressure (weather report) and to MAP with engine OFF — values should be essentially equal.
  4. Start engine and observe BARO vs MAP; BARO should remain near ambient while MAP changes with vacuum/boost.
  5. Wiggle test wiring and harness while monitoring live data to check for intermittent faults.
  6. If wiring and power/ground are good, disconnect sensor (if allowed) and verify scanner shows expected open-circuit behavior or known test value per service manual.
  7. Repair or replace damaged wiring or connector terminals, clear codes, and test drive to confirm proper operation and code does not return.
  8. If issue persists after verifying sensor and wiring, consider ECU input fault — consult manufacturer service information before replacing ECU.

Likely causes

  • Damaged sensor harness or connector (pins corroded, bent, or pushed out)
  • Sensor internal failure (stuck, inaccurate output)
  • Short to ground or to 5V reference on signal circuit
  • Intake manifold leak or blocked vent that alters BARO reading
  • MAP sensor fault producing inconsistent readings compared to BARO

Fault status

⚠️ Status
Barometric pressure sensor signal out of expected range or inconsistent with MAP/ambient pressure; ECM has stored P2226 and set MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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