AutoCodes – Chevrolet – P11B3 Chevrolet

P11B3 Chevrolet Code - HO2S Performance During Deceleration Fuel Cut-Off Bank 1 Sensor 2

Quick Answer

The oxygen content of the exhaust is measured via the nitrogen oxide (NOx) sensors. Common causes include Faulty Nitrogen Oxide (NOx) Sensor 2, Nitrogen Oxide Sensor 2 harness is open or shorted, Nitrogen Oxide 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: P11B3 Chevrolet indicates HO2S Performance During Deceleration Fuel Cut-Off Bank 1 Sensor 2.
Common causes: Common causes include Faulty Nitrogen Oxide (NOx) Sensor 2, Nitrogen Oxide Sensor 2 harness is open or shorted, Nitrogen Oxide 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 854

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 Sep 30, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11B3 Chevrolet Description

The oxygen content of the exhaust is measured via the nitrogen oxide (NOx) sensors. 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 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 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 when the NOx sensor module detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor.

OBDII Code P11B3 Chevrolet - HO2S Performance During Deceleration Fuel Cut-Off Bank 1 Sensor 2 - AutoCodes.com — P11B3 Chevrolet Code - HO2S Performance During Deceleration Fuel Cut-Off Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P11B3 Chevrolet?

Faulty Nitrogen Oxide (NOx) Sensor 2
Nitrogen Oxide Sensor 2 harness is open or shorted
Nitrogen Oxide Sensor 2 circuit poor electrical connection

How to Fix the DTC P11B3 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 P11B3 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 P11B3 Chevrolet code?

Need more information on how to fix the P11B3 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11B3 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P11B3 2014 Chevrolet Silverado — HO2S Performance During Deceleration Fuel Cut-Off Bank 1 Sensor 2
P11B3 2015 Chevrolet Silverado — HO2S Performance During Deceleration Fuel Cut-Off Bank 1 Sensor 2
P11B3 2016 Chevrolet Silverado — HO2S Performance During Deceleration Fuel Cut-Off Bank 1 Sensor 2
P11B3 2017 Chevrolet Silverado — HO2S Performance During Deceleration Fuel Cut-Off Bank 1 Sensor 2
P11B3 2018 Chevrolet Silverado — HO2S Performance During Deceleration Fuel Cut-Off Bank 1 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 P11B3 Chevrolet Code

1. What are the common symptoms of OBDII code P11B3 in a Chevrolet related to HO2S performance during deceleration fuel cut-off?

- Common symptoms include poor fuel economy, rough idling, stalling, and a noticeable decrease in engine performance.

2. What are the possible causes of OBDII code P11B3 in a Chevrolet indicating HO2S performance during deceleration fuel cut-off Bank 1 Sensor 2?

- Possible causes include a faulty oxygen sensor, issues with the fuel system, vacuum leaks, exhaust leaks, or a malfunctioning engine control module.

3. How can I diagnose the source of OBDII code P11B3 in my Chevrolet related to HO2S performance during deceleration fuel cut-off Bank 1 Sensor 2?

- Diagnose the code by performing a thorough inspection of the oxygen sensor, checking for leaks in the exhaust system, testing the fuel pressure, and scanning the engine control module for any related error codes.

4. Can a dirty or contaminated oxygen sensor cause OBDII code P11B3 in a Chevrolet indicating HO2S performance during deceleration fuel cut-off Bank 1 Sensor 2?

- Yes, a dirty or contaminated oxygen sensor can lead to inaccurate readings and trigger this error code.

5. How can I repair OBDII code P11B3 in my Chevrolet associated with HO2S performance during deceleration fuel cut-off Bank 1 Sensor 2?

- Repair options may include replacing the oxygen sensor, repairing any leaks in the exhaust system, cleaning or replacing the mass airflow sensor, and resetting the engine control module.

6. Is it safe to continue driving my Chevrolet with OBDII code P11B3 related to HO2S performance during deceleration fuel cut-off Bank 1 Sensor 2?

- It is not recommended to drive the vehicle with this error code present, as it can lead to decreased fuel efficiency and potential engine damage if left unresolved.

7. How important is it to address OBDII code P11B3 in a timely manner for a Chevrolet experiencing HO2S performance issues during deceleration fuel cut-off Bank 1 Sensor 2?

- It is crucial to address this code promptly to prevent further damage to the engine, ensure optimal fuel efficiency, and maintain the overall performance of the vehicle.

8. Can a malfunctioning engine control module cause OBDII code P11B3 in a Chevrolet related to HO2S performance during deceleration fuel cut-off Bank 1 Sensor 2?

- Yes, a malfunctioning engine control module can contribute to triggering this error code by providing incorrect signals to the oxygen sensor.

9. Are there any preventive measures to avoid encountering OBDII code P11B3 in a Chevrolet due to HO2S performance issues during deceleration fuel cut-off Bank 1 Sensor 2?

- Regular maintenance, such as replacing the oxygen sensor at recommended intervals, ensuring proper fuel system operation, and addressing any warning signs promptly, can help prevent this issue.

10. How can a professional mechanic help in diagnosing and resolving OBDII code P11B3 in a Chevrolet associated with HO2S performance during deceleration fuel cut-off Bank 1 Sensor 2?

- A professional mechanic can conduct a comprehensive diagnostic scan, perform in-depth inspections, utilize specialized tools for troubleshooting, and provide expert recommendations for repairing the underlying cause of the code.