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P11BE 2017 GMC Sierra Code - O2 Reference Voltage Circuit (NOx Sensor 2)

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 circuit poor electrical connection. 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
P11BE 2017 GMC Sierra indicates O2 Reference Voltage Circuit (NOx Sensor 2).
Common causes
Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 circuit poor electrical connection.
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.
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Code Popularity 209
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P11BE 2017 GMC Sierra Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.
OBDII Code P11BE 2017 GMC Sierra - O2 Reference Voltage Circuit (NOx Sensor 2) - AutoCodes.com
P11BE 2017 GMC Sierra Code - O2 Reference Voltage Circuit (NOx Sensor 2)
What does this mean?

What are the Possible Causes of the DTC P11BE 2017 GMC Sierra?

  • Faulty Nitrogen Oxides (NOx) Sensor 2
  • Nitrogen Oxides Sensor 2 harness is open or shorted
  • Nitrogen Oxides Sensor 2 circuit poor electrical connection

How to Fix the DTC P11BE 2017 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P11BE 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P11BE 2017 GMC Sierra code?

Need more information on how to fix the P11BE 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P11BE 2017 GMC Sierra Code

1. What does the OBDII code P11BE mean on a 2017 GMC Sierra?

P11BE indicates an issue with the O2 reference voltage circuit related to NOx Sensor 2, which monitors nitrogen oxide levels in the exhaust system.

2. What are the symptoms of code P11BE in a 2017 GMC Sierra?

Common symptoms include reduced fuel efficiency, a Check Engine Light, poor engine performance, and potentially entering limp mode.

3. What causes the P11BE code to appear in a 2017 GMC Sierra?

Possible causes include a faulty NOx Sensor 2, damaged wiring or connectors in the O2 reference voltage circuit, or a malfunctioning engine control module (ECM).

4. Can I drive my 2017 GMC Sierra with the P11BE code?

Driving with this code is not recommended, as it may lead to reduced engine performance, increased emissions, and potential damage to the exhaust system.

5. How do I diagnose the P11BE code on a 2017 GMC Sierra?

Start by scanning the vehicle with an OBDII tool, inspecting the wiring and connectors for the NOx Sensor 2, and testing the sensor's voltage and resistance.

6. How is the P11BE code fixed on a 2017 GMC Sierra?

Repairs may involve replacing the NOx Sensor 2, repairing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.

7. What tools are needed to fix the P11BE code on a 2017 GMC Sierra?

You'll need an OBDII scanner, a multimeter for circuit testing, and potentially tools to replace the NOx sensor or repair wiring.

8. How much does it cost to repair the P11BE code in a 2017 GMC Sierra?

Repair costs vary, but replacing a NOx sensor typically ranges from $400 to $800, depending on labor and parts pricing.

9. Can a faulty NOx sensor cause other problems in a 2017 GMC Sierra?

Yes, a faulty NOx sensor can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter over time.

10. Is the P11BE code covered under the 2017 GMC Sierra’s warranty?

It may be covered under the emissions warranty if the vehicle is within the coverage period. Check with a GMC dealer for confirmation.

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