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Home / DTC / P2229 — Barometric pressure sensor high

P2229 — Barometric pressure sensor high

Detailed page for trouble code P2229.

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P2229

MITSUBISHI P — Powertrain

Barometric pressure sensor high

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

Causes

  • Faulty barometric pressure sensor (internal failure)
  • Open or shorted wiring (signal shorted to battery voltage)
  • Poor connector contact, corrosion, or damaged terminals
  • Bad sensor reference supply or ground (5V reference fault)
  • Intake plumbing or MAP sensor contamination/interference
  • PCM/ECM fault or software error

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Poor idle quality or rough running
  • Hard starting or stalling
  • Reduced engine performance, hesitation or surging
  • Abnormal fuel trim values and reduced fuel economy
  • Turbo/boost control irregularities (on forced-induction engines)

What to check

  • Scan for additional related codes and record freeze-frame/live data
  • Visually inspect BARO sensor and connector for damage, corrosion, water ingress
  • Backprobe sensor connector: verify 5V reference, ground, and signal voltage with key ON
  • Compare BARO reading (kPa or hPa) on scan tool to local known ambient pressure
  • Wiggle harness while monitoring signal to check intermittent faults
  • Check continuity and for shorts between signal wire and battery (+) or other circuits

Signal parameters

  • Typical BARO sensor signal: often a 0.5–4.5 V analog output (varies by model)
  • At sea level expected pressure ≈ 100–103 kPa (≈1013 hPa); sensor reading should match ambient at key ON, engine OFF
  • Reference supply typically 5.0 V; ground near 0 V
  • Signal should be stable (no rapid spikes) and change only with real atmospheric pressure changes

Diagnostic algorithm

  1. Retrieve freeze-frame data and live BARO/MAP readings with a scan tool; note conditions when code set.
  2. Key ON, engine OFF: read BARO sensor value. It should approximate known local ambient pressure (use a weather report or a handheld barometer). If BARO is much higher, proceed.
  3. Inspect connector and wiring for damage, corrosion, bent pins, or water intrusion. Repair as needed.
  4. Backprobe the sensor connector: verify 5V reference at the reference pin, good ground, and measure signal voltage. If 5V or ground missing, trace/repair supply circuit to PCM.
  5. If 5V and ground are good but signal is high, disconnect the sensor and measure voltage on the signal line to check for a short to battery voltage. If voltage remains high with sensor disconnected, inspect wiring/short to ignition/battery.
  6. If wiring checks OK, substitute a known-good BARO sensor (or bench-test the sensor if possible). If the code clears and readings return to normal, replace the sensor.
  7. After repairs, clear codes and perform a road or key-cycle test while monitoring BARO and MAP values to confirm correct operation over range and no return of code.
  8. If repair and sensor replacement do not correct the issue, consider PCM diagnosis or reflash as a last resort.

Likely causes

  • Water/corrosion in sensor connector causing high signal
  • Signal wire shorted to ignition or battery voltage
  • Sensor internal electronics failed and produce high output
  • Faulty 5V reference from PCM causing abnormal sensor output
  • Incorrect replacement part (wrong sensor type/calibration)

Fault status

⚠️ Status
Barometric pressure sensor signal higher than expected. ECM detected a BARO circuit voltage/pressure above the allowable threshold and set DTC P2229. Investigate sensor, wiring, and reference/ground circuits.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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406

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