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P11BF 2016 Chevrolet Silverado Code - O2 Reference Voltage Circuit Low Voltage (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: P11BF 2016 Chevrolet Silverado indicates O2 Reference Voltage Circuit Low Voltage (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 283

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 P11BF 2016 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 P11BF 2016 Chevrolet Silverado - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 2) - AutoCodes.com — P11BF 2016 Chevrolet Silverado Code - O2 Reference Voltage Circuit Low Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11BF 2016 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 P11BF 2016 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 P11BF 2016 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 P11BF 2016 Chevrolet Silverado 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 P11BF 2016 Chevrolet Silverado Code

What does OBDII code P11BF mean on a 2016 Chevrolet Silverado?

Code P11BF indicates that the O2 reference voltage circuit for NOx Sensor 2 is reading low voltage, suggesting an issue with the sensor or its circuit.

What are the symptoms of code P11BF on a 2016 Chevrolet Silverado?

Common symptoms include the check engine light turning on, reduced fuel efficiency, potential limp mode, and increased emissions.

What causes code P11BF on a 2016 Chevrolet Silverado?

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

Can a bad NOx sensor cause code P11BF on a 2016 Chevrolet Silverado?

Yes, a malfunctioning NOx Sensor 2 is a common cause of this code, as it may fail to properly measure nitrogen oxide levels.

How is code P11BF diagnosed on a 2016 Chevrolet Silverado?

Diagnosis typically involves scanning the ECM with an OBDII scanner, inspecting the wiring and connectors for damage, and testing the NOx Sensor 2 for proper operation.

Can I drive my 2016 Chevrolet Silverado with a P11BF code?

Driving with this code is not recommended, as it may result in reduced performance, higher emissions, and potential damage to the emissions system.

How do you fix code P11BF on a 2016 Chevrolet Silverado?

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

How much does it cost to fix code P11BF on a 2016 Chevrolet Silverado?

Repair costs can vary but typically range from $300 to $800, depending on whether the sensor, wiring, or ECM needs replacement.

Can an ECM update resolve code P11BF on a 2016 Chevrolet Silverado?

In some cases, an ECM update or reprogramming may resolve the issue if the code is caused by software-related problems.

What tools are needed to diagnose and repair code P11BF on a 2016 Chevrolet Silverado?

Tools needed include an OBDII scanner, a multimeter for circuit testing, and possibly specialized equipment for sensor replacement or ECM reprogramming.