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P11FE 2017 GMC Sierra Code - O2 Low Reference Circuit High Voltage (NOx Sensor 2)

Quick Answer

The P11FE diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates an issue with the O2 Low Reference Circuit High Voltage related to the NOx Sensor 2. Common causes include Faulty NOx Sensor: The most common cause of this code is a malfunctioning NOx sensor 2, which may be sending incorrect voltage signals to the ECM, Wiring Issues: Damage or corrosion in the wiring harness connected to the NOx sensor can disrupt the low reference circuit and trigger this code, ECM Malfunction: A problem with the engine control module (ECM) can also lead to issues with the O2 low reference circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P11FE 2017 GMC Sierra indicates O2 Low Reference Circuit High Voltage (NOx Sensor 2).
Common causes
Common causes include Faulty NOx Sensor: The most common cause of this code is a malfunctioning NOx sensor 2, which may be sending incorrect voltage signals to the ECM, Wiring Issues: Damage or corrosion in the wiring harness connected to the NOx sensor can disrupt the low reference circuit and trigger this code, ECM Malfunction: A problem with the engine control module (ECM) can also lead to issues with the O2 low reference circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P11FE 2017 GMC Sierra Description

The P11FE diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates an issue with the O2 Low Reference Circuit High Voltage related to the NOx Sensor 2. This code specifically points to a problem with the oxygen sensor's low reference circuit, which is responsible for providing a stable voltage signal to the engine control module (ECM). The NOx sensor plays a crucial role in monitoring and controlling the levels of nitrogen oxide (NOx) emissions from the vehicle's exhaust system.

OBDII Code P11FE 2017 GMC Sierra - O2 Low Reference Circuit High Voltage (NOx Sensor 2)
P11FE 2017 GMC Sierra Code - O2 Low Reference Circuit High Voltage (NOx Sensor 2)

Common Causes of P11FE 2017 GMC Sierra

  1. Faulty NOx Sensor: The most common cause of this code is a malfunctioning NOx sensor 2, which may be sending incorrect voltage signals to the ECM.
  2. Wiring Issues: Damage or corrosion in the wiring harness connected to the NOx sensor can disrupt the low reference circuit and trigger this code.
  3. ECM Malfunction: A problem with the engine control module (ECM) can also lead to issues with the O2 low reference circuit.
  4. Exhaust System Leaks: Leaks in the exhaust system can introduce false air into the sensor, affecting its readings.
  5. Sensor Contamination: Contaminants such as oil or coolant can interfere with the sensor's operation and trigger this code.

Symptoms of P11FE 2017 GMC Sierra

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning NOx sensor can lead to poor fuel efficiency due to inaccurate emissions readings.
  3. Rough Idling: The engine may experience rough idling or hesitation during acceleration as a result of incorrect sensor readings.
  4. Increased Emissions: Higher levels of NOx emissions may be detected during emissions testing, indicating a potential issue with the sensor.

How to Fix P11FE 2017 GMC Sierra

  1. Diagnostic Scan: Begin by using an OBD-II scanner to retrieve the specific DTC and confirm the issue with the O2 low reference circuit high voltage.
  2. Inspect Wiring: Check the wiring harness for any damage, corrosion, or loose connections that may be affecting the sensor's operation.
  3. Test NOx Sensor: Test the NOx sensor 2 using a multimeter to verify its functionality and replace it if necessary.
  4. Clear Codes: After repairing the issue, clear the DTC from the ECM's memory using the OBD-II scanner to reset the check engine light.
  5. Road Test: Take the vehicle for a test drive to ensure that the repair has resolved the problem and that the check engine light remains off.

Cost to Fix P11FE 2017 GMC Sierra

The cost of repairing the O2 Low Reference Circuit High Voltage issue related to the NOx Sensor 2 can vary depending on the specific cause of the problem and the parts/labour rates in your area. In general, replacing a faulty NOx sensor can cost between $200 and $500, while addressing wiring issues or ECM malfunctions may require additional diagnostic time and labour costs. Overall, you can expect to pay anywhere from $300 to $800 for this repair, including parts and labour. Keep in mind that prices may fluctuate based on your location, the vehicle's make and model, and the shop you choose for the repair. It's advisable to obtain quotes from multiple auto repair shops to ensure you get the best deal.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P11FE 2017 GMC Sierra Code

1. What does the OBDII code P11FE mean on a 2017 GMC Sierra?

P11FE indicates an issue with the O2 low reference circuit reporting high voltage, specifically related to NOx Sensor 2.

2. What are common symptoms of code P11FE in a 2017 GMC Sierra?

Symptoms may include reduced fuel efficiency, poor engine performance, illuminated check engine light, and potential issues with emissions system operation.

3. What causes the P11FE code to appear?

Possible causes include damaged wiring or connectors in the NOx sensor circuit, a faulty NOx Sensor 2, corrosion in the sensor's electrical connections, or a malfunctioning engine control module (ECM).

4. Can a bad NOx Sensor 2 trigger the P11FE code?

Yes, a failing NOx Sensor 2 is a common cause of this code, as it may send incorrect voltage signals to the ECM.

5. How do I diagnose the P11FE code on my GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion, then test the NOx Sensor 2 for proper function using a multimeter or diagnostic tool.

6. Can I drive my 2017 GMC Sierra with the P11FE code?

While the vehicle may still be drivable, it is not recommended as it could lead to reduced performance, increased emissions, and potential damage to other components.

7. How do I fix the P11FE code?

Common repairs include repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the faulty NOx Sensor 2.

8. What tools are needed to troubleshoot the P11FE code?

You may need a multimeter, an OBDII scanner, and basic tools for inspecting and repairing wiring or connectors.

9. How much does it cost to fix the P11FE code on a GMC Sierra?

The repair cost can vary, but replacing a NOx sensor typically ranges from $300 to $700, including parts and labor.

10. Can a software update resolve the P11FE code?

In some cases, a software update for the ECM may address false readings, but this solution is less common and should only be considered after physical repairs have been ruled out.

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