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Home / DTC / P2226 — Barometric Pressure Sensor A Circuit

P2226 — Barometric Pressure Sensor A Circuit

Detailed page for trouble code P2226.

34,405codes
59brands
11,914generic
22,491specific
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P2226

Generic P — Powertrain

Barometric Pressure Sensor A Circuit

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short, or intermittent wiring between BARO sensor and PCM
  • Corroded, loose or damaged connector or pins at the sensor or PCM
  • Failed or internally shorted BARO sensor
  • Poor sensor reference voltage or ground (battery/PCM ground issue)
  • PCM input circuit fault
  • Water/contaminant intrusion at sensor or connector

Symptoms

  • MIL (Check Engine Light) illuminated
  • Reduced engine performance, hesitation or surging
  • Hard starting or rough idle in some conditions
  • Poor fuel economy or failed emissions test
  • Stored related freeze-frame data showing abnormal BARO values

What to check

  • Read and record freeze frame and live data (BARO, MAP, intake temp, battery voltage)
  • Compare BARO reading to MAP (key ON, engine OFF BARO should approximate ambient/map)
  • Inspect sensor connector and wiring for corrosion, damage, rodent chew or water
  • Check sensor reference voltage (typically 5 V) and ground at the connector
  • Back-probe signal wire and monitor voltage while changing altitude/closing intake to observe plausibility
  • Perform continuity/resistance checks between sensor pins and PCM connector

Signal parameters

  • Typical BARO sensor signal: 0.5–4.5 V (varies by manufacturer); should reflect ambient pressure
  • Reference voltage usually 5 V (some vehicles use 3.3 V) — verify exact spec for vehicle
  • At sea level ambient pressure ~101 kPa (≈14.7 psi); BARO reading should be near ambient pressure
  • BARO and MAP should be similar with engine off (both near ambient); during ignition/run MAP will be lower under vacuum
  • Signal should change slowly with altitude/weather, not flicker or jump rapidly

Diagnostic algorithm

  1. Connect a scan tool, read freeze-frame and live BARO data. Record sensor voltage and pressure value.
  2. Visually inspect the BARO sensor, connector, and wiring harness for damage, corrosion, or water entry.
  3. With ignition ON (engine OFF) back-probe sensor: verify reference voltage present (compare to spec).
  4. Measure sensor ground continuity to chassis and PCM ground; repair any high-resistance grounds.
  5. Measure signal voltage at the sensor with ignition ON; compare to expected ambient pressure. Note if value is out of range or intermittent.
  6. Compare BARO to MAP (KOEO); both should read near ambient. If MAP and BARO differ significantly, check MAP sensor and plumbing.
  7. Wiggle wiring and connector while monitoring signal for intermittent changes. Repair any damaged wiring or connector.
  8. If wiring and power/ground are good but signal is incorrect, substitute a known-good BARO sensor or bench-test replacement where possible.
  9. If replacement sensor resolves the issue, clear codes and test drive to confirm. If problem persists with good sensor, suspect PCM input fault and pursue PCM-level diagnostics or specialist testing.
  10. After repair, erase codes, verify no reoccurrence, and confirm proper engine operation and emissions readiness.

Likely causes

  • Damaged connector pins or corroded terminals at the BARO sensor
  • Wiring harness abrasion causing intermittent short to ground or voltage
  • Failed BARO sensor (common failure point)
  • Poor ground or blown reference voltage (sensor not receiving correct 5 V ref)

Fault status

⚠️ Status
P2226 — Barometric Pressure Sensor A Circuit: voltage/signal out of range or intermittent (electrical fault or sensor failure).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P2226

LAND ROVER P — Powertrain

Barometric Pressure Circuit

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short, or intermittent wiring between BARO sensor and PCM
  • Corroded, loose or damaged connector or pins at the sensor or PCM
  • Failed or internally shorted BARO sensor
  • Poor sensor reference voltage or ground (battery/PCM ground issue)
  • PCM input circuit fault
  • Water/contaminant intrusion at sensor or connector

Symptoms

  • MIL (Check Engine Light) illuminated
  • Reduced engine performance, hesitation or surging
  • Hard starting or rough idle in some conditions
  • Poor fuel economy or failed emissions test
  • Stored related freeze-frame data showing abnormal BARO values

What to check

  • Read and record freeze frame and live data (BARO, MAP, intake temp, battery voltage)
  • Compare BARO reading to MAP (key ON, engine OFF BARO should approximate ambient/map)
  • Inspect sensor connector and wiring for corrosion, damage, rodent chew or water
  • Check sensor reference voltage (typically 5 V) and ground at the connector
  • Back-probe signal wire and monitor voltage while changing altitude/closing intake to observe plausibility
  • Perform continuity/resistance checks between sensor pins and PCM connector

Signal parameters

  • Typical BARO sensor signal: 0.5–4.5 V (varies by manufacturer); should reflect ambient pressure
  • Reference voltage usually 5 V (some vehicles use 3.3 V) — verify exact spec for vehicle
  • At sea level ambient pressure ~101 kPa (≈14.7 psi); BARO reading should be near ambient pressure
  • BARO and MAP should be similar with engine off (both near ambient); during ignition/run MAP will be lower under vacuum
  • Signal should change slowly with altitude/weather, not flicker or jump rapidly

Diagnostic algorithm

  1. Connect a scan tool, read freeze-frame and live BARO data. Record sensor voltage and pressure value.
  2. Visually inspect the BARO sensor, connector, and wiring harness for damage, corrosion, or water entry.
  3. With ignition ON (engine OFF) back-probe sensor: verify reference voltage present (compare to spec).
  4. Measure sensor ground continuity to chassis and PCM ground; repair any high-resistance grounds.
  5. Measure signal voltage at the sensor with ignition ON; compare to expected ambient pressure. Note if value is out of range or intermittent.
  6. Compare BARO to MAP (KOEO); both should read near ambient. If MAP and BARO differ significantly, check MAP sensor and plumbing.
  7. Wiggle wiring and connector while monitoring signal for intermittent changes. Repair any damaged wiring or connector.
  8. If wiring and power/ground are good but signal is incorrect, substitute a known-good BARO sensor or bench-test replacement where possible.
  9. If replacement sensor resolves the issue, clear codes and test drive to confirm. If problem persists with good sensor, suspect PCM input fault and pursue PCM-level diagnostics or specialist testing.
  10. After repair, erase codes, verify no reoccurrence, and confirm proper engine operation and emissions readiness.

Likely causes

  • Damaged connector pins or corroded terminals at the BARO sensor
  • Wiring harness abrasion causing intermittent short to ground or voltage
  • Failed BARO sensor (common failure point)
  • Poor ground or blown reference voltage (sensor not receiving correct 5 V ref)

Fault status

⚠️ Status
P2226 — Barometric Pressure Sensor A Circuit: voltage/signal out of range or intermittent (electrical fault or sensor failure).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0106 P0107 P0108 P0118 P0119 P0171
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

P2226

MITSUBISHI P — Powertrain

Barometric pressure sensor

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open, short, or intermittent wiring between BARO sensor and PCM
  • Corroded, loose or damaged connector or pins at the sensor or PCM
  • Failed or internally shorted BARO sensor
  • Poor sensor reference voltage or ground (battery/PCM ground issue)
  • PCM input circuit fault
  • Water/contaminant intrusion at sensor or connector

Symptoms

  • MIL (Check Engine Light) illuminated
  • Reduced engine performance, hesitation or surging
  • Hard starting or rough idle in some conditions
  • Poor fuel economy or failed emissions test
  • Stored related freeze-frame data showing abnormal BARO values

What to check

  • Read and record freeze frame and live data (BARO, MAP, intake temp, battery voltage)
  • Compare BARO reading to MAP (key ON, engine OFF BARO should approximate ambient/map)
  • Inspect sensor connector and wiring for corrosion, damage, rodent chew or water
  • Check sensor reference voltage (typically 5 V) and ground at the connector
  • Back-probe signal wire and monitor voltage while changing altitude/closing intake to observe plausibility
  • Perform continuity/resistance checks between sensor pins and PCM connector

Signal parameters

  • Typical BARO sensor signal: 0.5–4.5 V (varies by manufacturer); should reflect ambient pressure
  • Reference voltage usually 5 V (some vehicles use 3.3 V) — verify exact spec for vehicle
  • At sea level ambient pressure ~101 kPa (≈14.7 psi); BARO reading should be near ambient pressure
  • BARO and MAP should be similar with engine off (both near ambient); during ignition/run MAP will be lower under vacuum
  • Signal should change slowly with altitude/weather, not flicker or jump rapidly

Diagnostic algorithm

  1. Connect a scan tool, read freeze-frame and live BARO data. Record sensor voltage and pressure value.
  2. Visually inspect the BARO sensor, connector, and wiring harness for damage, corrosion, or water entry.
  3. With ignition ON (engine OFF) back-probe sensor: verify reference voltage present (compare to spec).
  4. Measure sensor ground continuity to chassis and PCM ground; repair any high-resistance grounds.
  5. Measure signal voltage at the sensor with ignition ON; compare to expected ambient pressure. Note if value is out of range or intermittent.
  6. Compare BARO to MAP (KOEO); both should read near ambient. If MAP and BARO differ significantly, check MAP sensor and plumbing.
  7. Wiggle wiring and connector while monitoring signal for intermittent changes. Repair any damaged wiring or connector.
  8. If wiring and power/ground are good but signal is incorrect, substitute a known-good BARO sensor or bench-test replacement where possible.
  9. If replacement sensor resolves the issue, clear codes and test drive to confirm. If problem persists with good sensor, suspect PCM input fault and pursue PCM-level diagnostics or specialist testing.
  10. After repair, erase codes, verify no reoccurrence, and confirm proper engine operation and emissions readiness.

Likely causes

  • Damaged connector pins or corroded terminals at the BARO sensor
  • Wiring harness abrasion causing intermittent short to ground or voltage
  • Failed BARO sensor (common failure point)
  • Poor ground or blown reference voltage (sensor not receiving correct 5 V ref)

Fault status

⚠️ Status
P2226 — Barometric Pressure Sensor A Circuit: voltage/signal out of range or intermittent (electrical fault or sensor failure).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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P0106 P0107 P0108 P0118 P0119 P0171
406

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