P1107 Code? Here’s How to Fix It Quickly and Easily

The P1107 code is a manufacturer-specific powertrain code. Its exact definition depends on the vehicle application, commonly indicating a barometric pressure sensor circuit low voltage or low input condition.

This code identifies a detected sensor circuit condition, not necessarily a failed sensor. Proper diagnosis requires verifying the exact factory definition and testing the relevant sensor circuits.

Key Takeaways

• The P1107 code is manufacturer-specific, commonly indicating a BARO sensor circuit low voltage or low input condition on GM, Honda, and Acura applications.
• Possible causes include damaged wiring, corroded connectors, poor grounds, or a degraded sensor element.
• Symptoms may include an illuminated Check Engine Light, decreased fuel efficiency, or engine hesitation.
• Diagnosis requires confirming the exact factory definition and testing the specific sensor circuits and reference voltage.
• Repairs depend on the confirmed fault and may involve wiring repair, fixing poor connections, or sensor replacement.

P1107 Code Description and Implications

P1107 is a manufacturer-specific fault code. Its exact definition depends entirely on the vehicle application.

GM and Chevrolet applications: The code indicates a Barometric Pressure (BARO) Sensor Circuit Low Voltage. The powertrain control module detects that the sensor signal voltage has dropped below the expected minimum threshold.

Honda and Acura applications: The code indicates a BARO Sensor Circuit Low Input. The engine control module detects an abnormally low signal from the barometric pressure sensor, which may be integrated into the ECM.

Common Causes of the P1107 Code

Several conditions can trigger this manufacturer-specific malfunction code. Identifying the exact cause requires inspecting the specific control circuits and engine systems.

• Damaged wiring, corroded connectors, or poor electrical grounds in the BARO sensor signal, reference, or ground circuits.
• A short to ground in the sensor signal wire, pulling the voltage below the diagnostic threshold.
• A degraded or failed barometric pressure sensor element providing an inaccurate low-voltage signal.
• On applications where the BARO sensor is internal to the ECM, an internal ECM fault or corrupted software calibration.

Symptoms Associated With P1107

Symptoms vary depending on the specific system design and the underlying fault condition.

• Illuminated Check Engine Light on the instrument cluster.
• Decreased fuel efficiency due to the engine control module struggling to calculate air density and adjust the air-fuel mixture accurately.
• Engine hesitation, rough idling, or poor acceleration as the control module defaults to a substitute barometric value.

Diagnosing the P1107 Trouble Code

Diagnosis must begin by confirming the exact factory definition and inspecting the physical system components.

• Verify the exact manufacturer definition and locate the wiring diagram for the specific BARO sensor circuit.
• Inspect the sensor wiring and connectors for physical damage, chafing, or corrosion, paying close attention to the ground and 5-volt reference circuits.
• Use a scan tool to monitor live data, specifically the barometric pressure reading in kPa or Hz, and compare it to a known-good reference.
• Test the sensor signal voltage with a digital multimeter to confirm if the circuit is shorted to ground or if the sensor itself is outputting a low voltage.

Repairing the P1107 Issue

Repairs depend entirely on the confirmed root cause of the system malfunction.

• If wiring damage or a short to ground is found, repair or replace the affected harness sections and secure the routing.
• Clean or repair corroded connectors and ensure all sensor and ECM grounds are tight and free of corrosion.
• If the sensor fails live data and voltage testing and all external circuits are ruled out, replace the BARO sensor using a part meeting the correct vehicle specification.
• If the sensor is internal to the ECM and all external wiring is verified, follow the manufacturer procedure for ECM replacement or reprogramming.

Cost Considerations for P1107 Repairs

Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.

Replacing an external barometric pressure sensor or repairing a damaged wire is generally less expensive than diagnosing internal ECM faults or replacing the control module.

Prevention Strategies for Future Occurrences

While electrical and mechanical failures are not always preventable, some practices can reduce the risk of system issues.

• Inspecting exposed wiring and connectors in the engine bay can help identify developing damage from heat exposure, chafing, or moisture intrusion.
• Keeping the ECM and sensor connectors clean and properly sealed helps prevent corrosion that can cause circuit resistance and voltage drops.

Troubleshooting Tips and Best Practices

Always consult the exact manufacturer service information for your vehicle’s wiring diagrams and system architecture.

• Do not assume the BARO sensor is faulty simply because a low voltage code is present; wiring shorts to ground, poor grounds, and reference voltage issues must be ruled out first.
• On applications with an external BARO sensor, compare the scan tool barometric pressure reading against a known accurate local weather station absolute pressure reading to verify sensor accuracy.
• Verify technical service bulletins for your specific make and model, as manufacturers occasionally issue updated sensor part numbers, wiring harness revisions, or ECM software calibrations for circuit voltage codes.

More OBD-II Codes

Frequently Asked Questions

Is the P1107 code generic or manufacturer-specific?

No. P1107 is a manufacturer-specific code. Its exact definition varies by vehicle make, commonly indicating a barometric pressure sensor circuit low voltage or low input condition.

Can I drive my car with a P1107 code?

The vehicle typically remains drivable, but you may experience decreased fuel efficiency or engine hesitation. The control module will substitute a default barometric value, which may not be optimal for all altitudes.

Will a bad ground cause a P1107 code?

Yes. A poor ground connection in the sensor circuit can increase resistance and pull the signal voltage down, causing the control module to detect a low voltage or low input condition.

Can a MAP sensor cause a P1107 code?

On some applications, the manifold absolute pressure sensor and the barometric pressure sensor share the same housing. A fault in this combined sensor can trigger the P1107 code.

Will a P1107 code cause an emissions test failure?

Yes. Any code that illuminates the Check Engine Light or indicates an active powertrain control module sensor circuit fault will cause an automatic failure during an OBD-II emissions inspection.

What Should You Do About the P1107 Code?

Confirm the exact factory definition for your specific vehicle application. Follow the applicable manufacturer diagnostic procedure to test the relevant sensor circuits, reference voltage, and ground integrity.

Repair or replace the confirmed failed component or fix the identified wiring or connection issue, then retest the system to ensure proper operation.