Faulty barometric pressure sensor (often integrated into the mass air flow sensor on many Nissan models).; Damaged or corroded wiring in the BARO sensor circuit, such as an open or short to ground on the signal wire.; Poor electrical connection at the sensor or ECM connector, including loose pins or water intrusion.; Failed ECM, though this is uncommon and should be diagnosed last.; Contaminated or blocked sensor port, if the BARO sensor is a separate unit exposed to atmosphere.; Aftermarket air intake or modifications that disturb the sensor's reference pressure.; Extreme altitude changes without ECM recalibration, though the system normally self-adjusts.

DTC codes / Nissan codes / P1107

P1107 · NissanBARO Circuit Low Input

Q: What does code P1107 mean?

BARO Circuit Low Input. P1107 on Nissan vehicles indicates that the engine control module (ECM) has detected a low voltage signal from the barometric pressure (BARO) sensor circuit. The BARO sensor measures atmospheric pressure, and the ECM uses this data to calculate air density and adjust fuel delivery; a low input means the signal is below the expected range for current conditions.

P1107 on Nissan vehicles indicates that the engine control module (ECM) has detected a low voltage signal from the barometric pressure (BARO) sensor circuit. The BARO sensor measures atmospheric pressure, and the ECM uses this data to calculate air density and adjust fuel delivery; a low input means the signal is below the expected range for current conditions.

SystemPowertrain

Code typeNissan specific

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering

Symptoms you may notice

Illumination of the check engine light (malfunction indicator lamp) on the dashboard.
Often no noticeable symptoms besides the warning light, especially in mild weather or at low altitude.
Rough idle or stumbling, particularly if the ECM substitutes a default pressure value that is incorrect for the actual altitude.
Poor fuel economy or rich-running condition due to over-fueling from a low pressure reading.
Hesitation or reduced power during acceleration, especially at higher altitudes where the pressure difference is greater.
In rare cases, the engine may stall or be hard to start if the signal is far out of range.

Common causes, most likely first

Faulty barometric pressure sensor (often integrated into the mass air flow sensor on many Nissan models).
Damaged or corroded wiring in the BARO sensor circuit, such as an open or short to ground on the signal wire.
Poor electrical connection at the sensor or ECM connector, including loose pins or water intrusion.
Failed ECM, though this is uncommon and should be diagnosed last.
Contaminated or blocked sensor port, if the BARO sensor is a separate unit exposed to atmosphere.
Aftermarket air intake or modifications that disturb the sensor's reference pressure.
Extreme altitude changes without ECM recalibration, though the system normally self-adjusts.

How to diagnose and fix it

Verify the code with a scan tool and check for any related codes (such as P0101, P0102, P0103) that might indicate a mass air flow sensor issue.
Inspect the BARO sensor and its wiring for physical damage, corrosion, or loose connections; repair as needed.
Use a digital multimeter to check the reference voltage (typically 5V) and signal voltage at the sensor connector with the key on, engine off; compare to manufacturer specifications.
Test the sensor's output by applying vacuum or pressure with a hand pump while monitoring the signal voltage, if accessible.
If the sensor is integrated into the mass air flow sensor, test the MAF sensor's BARO output using a scan tool's live data and compare to actual atmospheric pressure for your altitude.
Replace the faulty sensor or mass air flow sensor assembly if testing confirms it is out of specification.
Clear the code and perform a road test to verify the repair, ensuring the BARO reading matches expected atmospheric pressure.

Before replacing the BARO sensor

On many Nissan models, the BARO sensor is built into the mass air flow sensor, so a faulty MAF can set P1107 without any separate BARO component to replace.
A low BARO reading can be caused by a clogged or restricted sensor port, especially if the sensor is mounted in a dirty area; cleaning the port may resolve the issue.
Technicians often overlook a poor ground connection for the sensor circuit, which can cause a low signal voltage even when the sensor itself is good.
The ECM may set P1107 when the battery voltage is low during cranking, so always check the battery and charging system before condemning the sensor.
After replacing the sensor, some Nissan models require a relearn procedure or idle air volume learning to restore proper fuel trims.

Can I keep driving with P1107?

You can generally continue driving with P1107, but avoid sustained high-speed driving or heavy loads until the fault is repaired, as incorrect fuel mixture may affect performance and emissions. If the engine runs poorly or stalls, have it diagnosed promptly.

Tools that help

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