AutoCodes – GMC – P11BE GMC

P11BE GMC 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 GMC 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 769

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 GMC 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 GMC - O2 Reference Voltage Circuit (NOx Sensor 2) - AutoCodes.com — P11BE GMC Code - O2 Reference Voltage Circuit (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11BE GMC?

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 GMC?

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 GMC 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 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P11BE 2014 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 2)
P11BE 2015 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 2)
P11BE 2016 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 2)
P11BE 2017 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 2)
P11BE 2018 GMC Sierra — O2 Reference Voltage Circuit (NOx Sensor 2)

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 GMC Code

1. What are the common symptoms of OBDII code P11BE in a GMC related to the O2 Reference Voltage Circuit (NOx Sensor 2)?

- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P11BE GMC related to the O2 Reference Voltage Circuit (NOx Sensor 2)?

- Possible causes may include a faulty NOx sensor, damaged wiring or connectors, issues with the NOx sensor heater circuit, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose OBDII code P11BE GMC related to the O2 Reference Voltage Circuit (NOx Sensor 2)?

- Diagnosis typically involves using a scan tool to retrieve the trouble code, inspecting the NOx sensor and its wiring for damage, testing the sensor heater circuit, and checking the PCM for proper operation.

4. What are some repair tips for addressing OBDII code P11BE GMC related to the O2 Reference Voltage Circuit (NOx Sensor 2)?

- Repair tips may include replacing the faulty NOx sensor, repairing damaged wiring or connectors, ensuring the sensor heater circuit is functioning correctly, and reprogramming or replacing the PCM if necessary.

5. Can I continue driving my GMC if OBDII code P11BE related to the O2 Reference Voltage Circuit (NOx Sensor 2) is present?

- It is not recommended to continue driving your GMC with this code present, as it can lead to further engine damage and potential safety issues. It's best to address the underlying problem as soon as possible.

6. Is it possible to reset OBDII code P11BE GMC related to the O2 Reference Voltage Circuit (NOx Sensor 2) without fixing the issue?

- While you can clear the code with a scan tool, the underlying issue causing the code will remain unresolved. It's crucial to diagnose and fix the root cause to prevent further problems.

7. Can a DIY enthusiast repair OBDII code P11BE GMC related to the O2 Reference Voltage Circuit (NOx Sensor 2)?

- Depending on your skill level and access to tools, you may be able to address this code yourself by following repair guides and being cautious when handling electrical components. However, professional help is recommended if you're unsure.

8. How much does it cost to repair OBDII code P11BE GMC related to the O2 Reference Voltage Circuit (NOx Sensor 2)?

- The cost of repair can vary depending on the specific issue causing the code, the labor rates of the repair shop, and the cost of parts. It's best to obtain quotes from different mechanics for an accurate estimate.

9. Is OBDII code P11BE GMC related to the O2 Reference Voltage Circuit (NOx Sensor 2) a common issue in GMC vehicles?

- While not as common as some other OBDII codes, issues related to the O2 Reference Voltage Circuit and NOx sensor can occur in GMC vehicles, especially in models equipped with this technology.

10. How long does it typically take to repair OBDII code P11BE GMC related to the O2 Reference Voltage Circuit (NOx Sensor 2)?

- The repair time can vary based on the exact problem causing the code, the availability of parts, and the proficiency of the mechanic. In general, it may take a few hours to a day to complete the repair.