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P11BE 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 309

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - O2 Reference Voltage Circuit (NOx Sensor 2) - AutoCodes.com — P11BE 2018 Chevrolet Silverado Code - O2 Reference Voltage Circuit (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11BE 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P11BE 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What does OBDII code P11BE indicate on a 2018 Chevrolet Silverado?

- OBDII code P11BE indicates a fault in the O2 reference voltage circuit of NOx Sensor 2.

2. What are the common symptoms of OBDII code P11BE in a 2018 Chevrolet Silverado?

- Common symptoms of P11BE may include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

3. What are the possible causes of OBDII code P11BE on a 2018 Chevrolet Silverado?

- Possible causes of P11BE include a faulty NOx Sensor 2, damaged wiring or connectors in the O2 reference voltage circuit, or a problem with the engine control module.

4. How can I diagnose OBDII code P11BE on my 2018 Chevrolet Silverado?

- Diagnosing P11BE typically involves using an OBDII scanner to retrieve the code, inspecting the NOx Sensor 2 and its wiring for damage, and testing the O2 reference voltage circuit for proper operation.

5. Can I drive my 2018 Chevrolet Silverado with OBDII code P11BE?

- It is not recommended to continue driving your Silverado with P11BE as the issue may lead to further damage and decreased performance. It's best to address the problem promptly.

6. How can I repair OBDII code P11BE on my 2018 Chevrolet Silverado?

- Repairing P11BE may involve replacing the NOx Sensor 2, repairing any damaged wiring or connectors in the O2 reference voltage circuit, or reprogramming the engine control module.

7. Are there any DIY tips for fixing OBDII code P11BE on a 2018 Chevrolet Silverado?

- While some basic inspections can be done by DIY enthusiasts, diagnosing and repairing P11BE may require specialized tools and expertise. It's advisable to consult a professional mechanic for proper diagnosis and repair.

8. How much does it cost to fix OBDII code P11BE on a 2018 Chevrolet Silverado?

- The cost of fixing P11BE can vary depending on the exact cause of the issue, the parts needed for repair, and labor costs. It's recommended to get estimates from local mechanics or dealerships.

9. Can OBDII code P11BE on a 2018 Chevrolet Silverado cause other problems if left unaddressed?

- Leaving P11BE unaddressed can potentially lead to reduced fuel efficiency, increased emissions, and further damage to the engine or emissions control system of your Silverado.

10. How long does it typically take to repair OBDII code P11BE on a 2018 Chevrolet Silverado?

- The repair time for P11BE can vary depending on the extent of the issue and the availability of parts. In general, a skilled mechanic should be able to diagnose and repair the problem within a few hours to a day.