AutoCodes – Chevrolet – P11BE Chevrolet

P11BE Chevrolet 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 Chevrolet 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,075

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P11BE Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P11BE Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P11BE 2014 Chevrolet Silverado — O2 Reference Voltage Circuit (NOx Sensor 2)
P11BE 2015 Chevrolet Silverado — O2 Reference Voltage Circuit (NOx Sensor 2)
P11BE 2016 Chevrolet Silverado — O2 Reference Voltage Circuit (NOx Sensor 2)
P11BE 2017 Chevrolet Silverado — O2 Reference Voltage Circuit (NOx Sensor 2)
P11BE 2018 Chevrolet Silverado — 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 Chevrolet Code

1. What is the common symptom of OBDII code P11BE in a Chevrolet related to the O2 Reference Voltage Circuit (NOx Sensor 2)?

- The most common symptom is the illumination of the check engine light on the dashboard.

2. What are the typical causes of OBDII code P11BE in a Chevrolet?

- Some common causes include a faulty NOx sensor, wiring issues, or a problem with the engine control module (ECM).

3. How can I diagnose the O2 Reference Voltage Circuit issue triggering code P11BE in my Chevrolet?

- A thorough inspection of the NOx sensor, checking the wiring for any damage, and testing the ECM can help diagnose the problem.

4. Can a bad NOx sensor cause OBDII code P11BE in a Chevrolet?

- Yes, a malfunctioning NOx sensor, particularly NOx Sensor 2, can trigger the P11BE code.

5. What are the repair options for fixing OBDII code P11BE in a Chevrolet?

- Repair options may include replacing the NOx sensor, repairing damaged wiring, or reprogramming the ECM.

6. Is it safe to continue driving my Chevrolet with OBDII code P11BE present?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent potential long-term damage.

7. How much does it typically cost to repair OBDII code P11BE in a Chevrolet?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to a thousand dollars.

8. Can I reset OBDII code P11BE in my Chevrolet using an OBDII scanner?

- Yes, an OBDII scanner can be used to clear the code, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. What role does the O2 Reference Voltage Circuit play in the operation of a Chevrolet vehicle?

- The O2 Reference Voltage Circuit is essential for monitoring the NOx sensor's performance and ensuring optimal emissions control in the vehicle.

10. Are there any preventive maintenance steps I can take to avoid OBDII code P11BE in my Chevrolet?

- Regularly inspecting and maintaining the NOx sensor, as well as ensuring proper wiring connections, can help prevent issues leading to the P11BE code.