Troubleshooting GMC Acadia P0137 Error Code

How to Fix the P0137 Error Code in Your GMC Acadia

If you're a GMC Acadia owner and your vehicle's diagnostic system has flagged an error code P0137, you're likely dealing with an issue related to the oxygen sensor. This guide will walk you through understanding what the P0137 error code means, common symptoms, and step-by-step solutions to resolve the issue.

Understanding the P0137 Error Code

The P0137 code indicates that there is a low voltage problem with the oxygen sensor in bank 1, sensor 2. This sensor is located behind the catalytic converter and is crucial for measuring the amount of oxygen in the exhaust gases exiting the engine. A proper reading helps in regulating the air-fuel mixture and maintaining efficient engine performance.

Common Symptoms of P0137 in GMC Acadia

  • Check Engine Light: This is the most common symptom and it activates when the sensor fails to send accurate data to the engine's computer.
  • Poor Fuel Economy: If the oxygen sensor isn't working properly, the engine might not efficiently use fuel, leading to increased consumption.
  • Rough Idling: You might notice that your Acadia is running rougher than usual, especially at idle.
  • Emission Failures: Since the oxygen sensor helps in controlling emissions, a faulty sensor might lead to increased emissions, causing the vehicle to fail emission tests.

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Step-by-Step Guide to Fixing P0137

Tools and Materials Needed

  • OBD-II scanner
  • Wrench set
  • New oxygen sensor (if needed)
  • Protective gloves

Diagnosis and Repair

  1. Scan the Vehicle: Use an OBD-II scanner to confirm the presence of the P0137 code. Note any other codes that might appear.
  2. Inspect the Oxygen Sensor: Locate the oxygen sensor behind the catalytic converter. Check for any visible signs of damage or wear.
  3. Check the Wiring: Inspect the wiring and connectors leading to the oxygen sensor for any signs of corrosion, damage, or disconnection.
  4. Test the Sensor: If your scanner has the capability, monitor the live data to see if the oxygen sensor is functioning within normal parameters.
  5. Replace the Sensor: If the sensor is faulty, replace it. Unscrew the old sensor with a wrench, remove it, and install the new one. Ensure it is tightly secured and the wiring is correctly connected.
  6. Clear the Code: After replacing the sensor, use the OBD-II scanner to clear the P0137 code.
  7. Test Drive: Take your Acadia for a test drive to ensure that the Check Engine Light does not reappear and the vehicle is running smoothly.

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Preventive Measures

  • Regular Maintenance: Regularly check and replace the oxygen sensors as recommended by GMC maintenance guidelines.
  • Quality Parts: Always use high-quality replacement parts to ensure long-lasting repairs.


Dealing with a P0137 error code in your GMC Acadia can be straightforward if you follow these steps. Remember, maintaining your vehicle’s sensors is key to ensuring optimal performance and fuel efficiency. If you're not comfortable performing these repairs yourself, consider using Mavyn’s services. You can chat with Mavyn GPT or connect with a human expert to get personalized assistance.

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For more detailed guidance or if you encounter additional issues, don't hesitate to reach out to Mavyn’s expert help services. Whether through AI or human expertise, Mavyn is here to assist you in keeping your GMC Acadia running smoothly.