P11FE 2015 GMC Sierra Code - O2 Low Reference Circuit High Voltage (NOx Sensor 2)
Quick Answer
The P11FE diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the O2 low reference circuit high voltage, specifically related to NOx Sensor 2. Common causes include Faulty NOx Sensor: The most common cause of this code is a malfunctioning NOx sensor, which may be due to internal electrical issues or sensor degradation, Wiring Issues: Corrosion, damage, or loose connections in the wiring harness connected to the NOx sensor can cause high voltage readings, ECM Malfunction: A problem with the engine control module (ECM) that processes the NOx sensor data can lead to erroneous voltage readings. 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 2015 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, which may be due to internal electrical issues or sensor degradation, Wiring Issues: Corrosion, damage, or loose connections in the wiring harness connected to the NOx sensor can cause high voltage readings, ECM Malfunction: A problem with the engine control module (ECM) that processes the NOx sensor data can lead to erroneous voltage readings.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P11FE 2015 GMC Sierra Description
The P11FE diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates a problem with the O2 low reference circuit high voltage, specifically related to NOx Sensor 2. This code is typically associated with the vehicle's emissions control system, as the NOx sensor plays a crucial role in monitoring and reducing harmful nitrogen oxide emissions.
Common Causes of P11FE 2015 GMC Sierra
- Faulty NOx Sensor: The most common cause of this code is a malfunctioning NOx sensor, which may be due to internal electrical issues or sensor degradation.
- Wiring Issues: Corrosion, damage, or loose connections in the wiring harness connected to the NOx sensor can cause high voltage readings.
- ECM Malfunction: A problem with the engine control module (ECM) that processes the NOx sensor data can lead to erroneous voltage readings.
- Exhaust System Leaks: Any leaks in the exhaust system before the NOx sensor can introduce excess oxygen into the exhaust stream, triggering high voltage readings.
- Contaminated Exhaust: Contaminants in the exhaust gases, such as oil or coolant, can interfere with the NOx sensor's operation and cause high voltage readings.
Symptoms of P11FE 2015 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
- Reduced Fuel Efficiency: A faulty NOx sensor can cause the engine to run rich or lean, leading to decreased fuel efficiency.
- Rough Idle: The engine may experience rough idling or hesitation during acceleration due to incorrect fuel mixture.
- Failed Emissions Test: If the NOx sensor is not functioning properly, the vehicle may fail emissions testing due to increased nitrogen oxide emissions.
- Loss of Power: In severe cases, the vehicle may experience a noticeable loss of power and performance.
How to Fix P11FE 2015 GMC Sierra
- Diagnostic Scan: Begin by using a diagnostic scanner to retrieve the specific trouble code and confirm the issue with the NOx sensor.
- Inspect Wiring: Check the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring as needed.
- Test NOx Sensor: Test the NOx sensor using a multimeter to verify its functionality. Replace the sensor if it fails the test.
- Clear Codes: After making the necessary repairs, clear the DTCs from the ECM memory using the diagnostic scanner.
- Test Drive: Take the vehicle for a test drive to ensure that the check engine light does not reappear and that the vehicle's performance has returned to normal.
Cost to Fix P11FE 2015 GMC Sierra
The cost of repairing a P11FE code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the parts required for the repair. In general, the cost of replacing a NOx sensor can range from $200 to $500, including parts and labor. Additional costs may apply if wiring repairs or ECM diagnostics are necessary.
Need more information about the P11FE 2015 GMC Sierra code?
Need more information on how to fix the P11FE 2015 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P11FE 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P11FE 2015 GMC Sierra Code
1. What does the OBDII code P11FE mean on a 2015 GMC Sierra?
P11FE indicates an issue with the "O2 Low Reference Circuit High Voltage" for NOx Sensor 2, which monitors nitrogen oxide emissions.
2. What are the symptoms of the P11FE code on a 2015 GMC Sierra?
Common symptoms include an illuminated check engine light, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.
3. What causes the P11FE code to appear on the 2015 GMC Sierra?
Possible causes include a faulty NOx sensor 2, damaged or corroded wiring, a poor electrical connection, or a malfunction in the engine control module (ECM).
4. How do I diagnose the P11FE code on my GMC Sierra?
Start by scanning for codes, inspecting the wiring and connectors for damage, testing the NOx sensor’s voltage, and verifying the ECM functionality.
5. Can I drive my 2015 GMC Sierra with the P11FE code?
While the truck may still run, driving with this code can lead to further damage, reduced performance, or higher emissions. It’s best to address the issue promptly.
6. How do I fix the P11FE code on a 2015 GMC Sierra?
Repairs may include replacing the NOx sensor 2, repairing damaged wiring or connectors, or reprogramming/updating the ECM if necessary.
7. How much does it cost to repair the P11FE code on a GMC Sierra?
The cost depends on the exact issue but typically ranges from $200 to $600 for parts and labor, with the NOx sensor being the most expensive component.
8. Where is NOx sensor 2 located on a 2015 GMC Sierra?
NOx sensor 2 is typically located downstream in the exhaust system, near the catalytic converter.
9. Can a bad NOx sensor cause the P11FE code?
Yes, a malfunctioning NOx sensor is one of the most common causes of the P11FE code.
10. Does the P11FE code affect emissions testing on a 2015 GMC Sierra?
Yes, the code indicates an emissions-related issue, which will likely cause the vehicle to fail emissions testing until repaired.
Discuss the causes and fixes for P11FE 2015 GMC Sierra OBDII Code
Code P11FE 2015 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.