AutoCodes – GMC – P11BE 2015 GMC Sierra

P11BE 2015 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 2015 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 159

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11BE 2015 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 2015 GMC Sierra - O2 Reference Voltage Circuit (NOx Sensor 2) - AutoCodes.com — P11BE 2015 GMC Sierra Code - O2 Reference Voltage Circuit (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11BE 2015 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 2015 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 2015 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 2015 GMC Sierra code?

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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 2015 GMC Sierra Code

What does the OBDII code P11BE mean on a 2015 GMC Sierra?

The P11BE code indicates an issue with the O2 reference voltage circuit for NOx Sensor 2, typically related to abnormal voltage readings or circuit faults.

What are the common symptoms of the P11BE code in a 2015 GMC Sierra?

Symptoms include the check engine light turning on, reduced engine performance, increased emissions, and potential issues with fuel efficiency.

What causes the P11BE code to appear on a 2015 GMC Sierra?

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

How is the P11BE code diagnosed?

A technician will use an OBDII scanner to confirm the code, inspect the NOx sensor wiring and connectors, test the sensor's reference voltage, and evaluate ECM functionality.

Can I drive my 2015 GMC Sierra with the P11BE code?

Driving with the P11BE code is not recommended as it can lead to poor engine performance, increased emissions, and potential damage to the exhaust system over time.

How do I fix the P11BE code on my 2015 GMC Sierra?

Repairs may include replacing the NOx Sensor 2, repairing or replacing damaged wiring, cleaning corroded connectors, or in rare cases, reprogramming or replacing the ECM.

How much does it cost to fix the P11BE code on a 2015 GMC Sierra?

Repair costs vary but typically range from $200 to $600, depending on whether the NOx sensor or wiring needs replacement.

Can a faulty NOx sensor trigger other codes besides P11BE?

Yes, a faulty NOx sensor can cause other related codes, such as those indicating sensor circuit issues or emissions control problems.

Is the P11BE code related to emissions regulations?

Yes, the P11BE code affects the performance of the NOx sensor, which is crucial for controlling nitrogen oxide emissions and meeting emissions standards.

How can I prevent the P11BE code from occurring on my 2015 GMC Sierra?

Regular maintenance, inspecting wiring and connectors for damage, and promptly addressing any check engine light can help prevent this code from appearing.