Troubleshooting GM’s Barometric Pressure Sensor: Solving the P1107 Code

Troubleshooting GM’s Barometric Pressure Sensor: Solving the P1107 Code

The Diagnostic Trouble Code (DTC) P1107 for General Motors (GM) vehicles indicates a “Barometric Pressure Sensor Circuit Low Voltage.” This code is triggered when the Engine Control Module (ECM) detects an abnormally low voltage signal from the Barometric Pressure (BARO) sensor. The BARO sensor is essential for measuring atmospheric pressure and ensuring the engine’s air-fuel mixture is optimized for various driving conditions.

How Serious Is This Issue?

The P1107 code is a serious issue because it directly impacts the engine’s performance and efficiency. If the BARO sensor is not functioning correctly, it can lead to incorrect air-fuel mixture calculations, resulting in poor engine performance, increased emissions, and potential damage to other engine components. Immediate attention is recommended to prevent further complications.

Is It Safe to Drive with This DTC Code?

Driving with a P1107 code is generally not safe. The malfunctioning BARO sensor can cause the engine to run inefficiently, leading to poor performance, increased fuel consumption, and potential safety risks such as stalling. It’s advisable to have the issue diagnosed and repaired as soon as possible.

Symptoms and Common Causes


  • Check Engine Light (CEL) illuminated
  • Rough idling or stalling
  • Poor engine performance
  • Reduced fuel efficiency
  • Difficulty starting the engine

Common Causes:

  • Faulty BARO sensor
  • Damaged or disconnected vacuum hoses
  • Electrical issues such as damaged wiring or connectors
  • Faulty Powertrain Control Module (PCM)
  • Sensor ground circuit intermittently open or shorted to voltage

How Can I Fix It?

To fix the P1107 code, follow these steps:

  1. Inspect Vacuum Hoses: Check for any cracks, disconnections, or damage in the vacuum hoses connected to the BARO sensor.
  2. Test the Sensor: Use a multimeter to test the BARO sensor for proper voltage and functionality.
  3. Check Electrical Connections: Inspect the wiring and connectors for any signs of damage or corrosion.
  4. Replace Faulty Components: If the BARO sensor or related components are faulty, replace them.
  5. Reset the Code: After making the necessary repairs, use an OBD-II scanner to clear the code and reset the Check Engine Light.

Can I Fix This DTC Code Myself?

Yes, if you have basic mechanical skills and the right tools, you can fix the P1107 code yourself. You’ll need a multimeter, vacuum pump, and possibly some replacement parts like vacuum hoses or sensors. However, if you’re not comfortable with diagnosing and repairing vehicle issues, it’s best to consult a professional mechanic.

Parts That Might Need Replacement and Repair Costs


  • BARO sensor
  • Vacuum hoses
  • Electrical connectors or wiring


  • BARO sensor: $30 – $100
  • Vacuum hoses: $10 – $30
  • Labor costs: $50 – $150 per hour (if you hire a mechanic)

Will the Repair Be Expensive?

The cost of repairing a P1107 code can vary depending on the specific issue and the parts that need replacement. Generally, it is not considered a very expensive repair, especially if you can perform the work yourself. However, labor costs can add up if you need professional assistance.

Can I Reset the DTC Code Myself?

Yes, you can reset the DTC code yourself using an OBD-II scanner. After performing the necessary repairs, connect the scanner to your vehicle’s OBD-II port, follow the instructions to clear the code, and reset the Check Engine Light.

Will It Affect Performance or Fuel Efficiency?

Yes, a P1107 code can significantly affect your vehicle’s performance and fuel efficiency. The BARO sensor plays a crucial role in the engine’s air-fuel mixture regulation. A malfunction can lead to poor engine performance, increased fuel consumption, and potential stalling issues.

How Can I Prevent It in the Future?

To prevent the P1107 code from recurring:

  • Regularly inspect and maintain vacuum hoses and electrical connections.
  • Ensure the BARO sensor is in good working condition.
  • Perform routine vehicle maintenance and address any issues promptly.
  • Use high-quality replacement parts to avoid premature failures.

By following these guidelines, you can ensure your vehicle runs smoothly and efficiently, minimizing the chances of encountering the P1107 code again.

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