Faulty BARO sensor (integrated into the MAP sensor on many Honda models) giving a skewed or intermittent signal.; Contaminated or damaged MAP/BARO sensor due to oil, dirt, or moisture intrusion.; Wiring harness damage (open, short, or high resistance) between the BARO sensor and the PCM.; Corroded or loose sensor connector pins causing intermittent signal loss.; PCM software calibration issue or internal PCM fault, though this is less common.; Restricted or leaking intake system affecting the pressure relationship the PCM uses to validate BARO.; Extreme altitude operation combined with a sensor that is marginally out of specification.

DTC codes / Honda codes / P1106

P1106 · HondaBARO Circuit Range Performance Malfunction

Q: What does code P1106 mean?

BARO Circuit Range Performance Malfunction. P1106 on a Honda means the powertrain control module (PCM) has detected that the barometric pressure (BARO) sensor signal is outside the expected range for the current operating conditions, typically during a key-on or steady-state cruise check. The PCM compares the BARO reading against a calculated value derived from the manifold absolute pressure (MAP) sensor and other inputs, and it sets this code when the two disagree beyond a calibrated threshold.

P1106 on a Honda means the powertrain control module (PCM) has detected that the barometric pressure (BARO) sensor signal is outside the expected range for the current operating conditions, typically during a key-on or steady-state cruise check. The PCM compares the BARO reading against a calculated value derived from the manifold absolute pressure (MAP) sensor and other inputs, and it sets this code when the two disagree beyond a calibrated threshold.

SystemPowertrain

Code typeHonda specific

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Often no symptoms besides the warning light, especially if the sensor is only slightly out of range.
Rough idle or unstable engine speed as the PCM misjudges air density and fuel delivery.
Poor fuel economy or rich/lean running conditions noticed over time.
Hesitation or stumble during acceleration, particularly at high altitude or during sudden throttle changes.
In rare cases, a no-start or hard-start condition if the BARO signal is completely implausible.

Common causes, most likely first

Faulty BARO sensor (integrated into the MAP sensor on many Honda models) giving a skewed or intermittent signal.
Contaminated or damaged MAP/BARO sensor due to oil, dirt, or moisture intrusion.
Wiring harness damage (open, short, or high resistance) between the BARO sensor and the PCM.
Corroded or loose sensor connector pins causing intermittent signal loss.
PCM software calibration issue or internal PCM fault, though this is less common.
Restricted or leaking intake system affecting the pressure relationship the PCM uses to validate BARO.
Extreme altitude operation combined with a sensor that is marginally out of specification.

How to diagnose and fix it

Connect a scan tool and record the BARO, MAP, and throttle position sensor (TPS) readings at key-on, engine off, and compare BARO to actual local atmospheric pressure.
Inspect the BARO/MAP sensor connector and wiring for corrosion, loose pins, or chafed insulation, and repair as needed.
Check the sensor's reference voltage and ground circuits with a multimeter to rule out wiring faults before condemning the sensor.
Clean the sensor inlet with electrical contact cleaner if contamination is suspected, then recheck live data.
Replace the BARO/MAP sensor if live data confirms a skewed or erratic signal that does not match actual pressure.
Clear the code and perform a road test under the conditions that originally set the code to verify the repair.
If the code returns with good wiring and a known-good sensor, check for PCM calibration updates or internal PCM faults.

Before you replace the BARO sensor

On many Hondas the BARO sensor is integrated into the MAP sensor, so a faulty MAP sensor can set P1106 even though the code names BARO specifically.
A dirty air filter or a restricted intake can alter the pressure relationship the PCM uses to validate BARO, sometimes triggering P1106 without any sensor fault.
Technicians often overlook a weak battery or poor ground connection, which can cause reference voltage fluctuations that mimic a BARO sensor failure.
P1106 can be set by a PCM that has not learned the correct BARO value after a battery disconnect or PCM reset, so a relearn procedure may be required.
Do not assume the sensor is bad just because the code points to it; always compare live BARO data to a known-good barometer or a nearby weather station's pressure reading.

Can I keep driving with P1106?

You can generally continue driving with P1106 because the PCM substitutes a default BARO value and the engine remains drivable, but avoid heavy acceleration or towing until the fault is repaired. If you notice rough running or poor fuel economy, have it diagnosed promptly to prevent long-term engine management issues.

Tools that help

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Guidance is general and written for Honda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.