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DTC codes / Nissan codes / P1106

P1106 · NissanBARO Circuit Range Performance Malfunction

P1106 on Nissan vehicles indicates that the engine control module (ECM) has detected a range or performance problem with the barometric pressure (BARO) sensor circuit, which measures atmospheric pressure for fuel and ignition calculations. The ECM compares the BARO signal against expected values from other sensors, such as the mass air flow (MAF) and manifold absolute pressure (MAP) sensors, and sets this code when the reading falls outside the acceptable range or does not change as expected during key-on or driving conditions.

SystemPowertrain
Code typeNissan specific
SeverityLow
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Rough idle or unstable engine speed, especially at high altitudes
  • Poor fuel economy or rich/lean fuel mixture symptoms
  • Hesitation or stumble during acceleration
  • In rare cases, hard starting or stalling when the BARO reading is severely skewed

Common causes, most likely first

  1. Faulty barometric pressure (BARO) sensor internal to the mass air flow (MAF) sensor or engine control module (ECM)
  2. Contaminated or obstructed BARO sensor sensing element
  3. Damaged or corroded wiring or connectors in the BARO sensor circuit
  4. Poor electrical connection at the ECM or sensor ground
  5. ECM software calibration issue requiring reprogramming
  6. Aftermarket air intake or modifications that affect sensor readings
  7. Extreme altitude changes without ECM adaptation (less common)

How to diagnose and fix it

  1. Verify the stored code and check for any related diagnostic trouble codes (DTCs) using a scan tool
  2. Inspect the BARO sensor and its wiring for physical damage, corrosion, or loose connections
  3. Compare the BARO reading on the scan tool with actual atmospheric pressure for your altitude (using a known good source)
  4. Check the MAF sensor for contamination and clean or replace if the BARO sensor is integrated
  5. Perform a voltage drop test on the sensor ground and reference voltage circuits
  6. Reprogram the ECM with the latest calibration if applicable
  7. Replace the BARO sensor or MAF sensor assembly if testing confirms an internal fault

BARO Sensor Diagnostics and Hidden Causes

  • On many Nissan models, the BARO sensor is integrated into the mass air flow (MAF) sensor, so a faulty MAF can set P1106 even when the MAF signal itself appears normal.
  • A dirty or contaminated MAF sensor sensing element can skew the BARO reading without triggering a MAF-specific code, leading to misdiagnosis.
  • The ECM may set P1106 if the BARO reading does not change appropriately during a key-on engine-off to engine-running transition, so a sensor that reads correctly at sea level may still fail a dynamic test.
  • Altitude changes can cause temporary BARO discrepancies, but the ECM should adapt; persistent codes after driving at different altitudes indicate a real fault.
  • Aftermarket air intake systems that alter airflow characteristics can cause the ECM to misinterpret BARO sensor performance, so check for modifications before replacing parts.

Can I keep driving with P1106?

The vehicle is generally safe to drive with P1106 because the ECM substitutes a default barometric pressure value, but you may experience reduced fuel economy or slight driveability issues. Avoid sustained driving at high altitudes or heavy load until the fault is repaired, as the default value may be inaccurate.

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 Nissan vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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