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P11BE Buick 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 Buick 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 450

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

What does this mean?

What are the Possible Causes of the DTC P11BE Buick?

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 Buick?

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 Buick 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.

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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 Buick Code

1. What is OBDII code P11BE in a Buick related to?

The code P11BE in a Buick specifically points to an issue with the O2 Reference Voltage Circuit for NOx Sensor 2.

2. What are common symptoms of OBDII code P11BE in a Buick?

Common symptoms of code 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 in a Buick?

Potential causes of code P11BE can include a faulty NOx sensor, 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 in my Buick?

Diagnosing code P11BE typically involves using an OBDII scanner to retrieve the code, checking the NOx sensor and related wiring for any visible damage, and testing the O2 reference voltage circuit for proper operation.

5. Can I drive my Buick with OBDII code P11BE?

It is not recommended to drive your Buick with an active P11BE code, as it can lead to further damage to the engine or emissions system. It is best to address the issue promptly.

6. How can I repair OBDII code P11BE in my Buick?

Repairing code P11BE may involve replacing the NOx sensor, repairing any damaged wiring or connectors in the O2 reference voltage circuit, or reprogramming the engine control module if necessary.

7. Will resetting the check engine light make OBDII code P11BE go away?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing code P11BE is not resolved, the code is likely to reappear after some driving cycles.

8. How much does it cost to fix OBDII code P11BE in a Buick?

The cost of fixing code P11BE can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can a novice DIYer fix OBDII code P11BE in a Buick?

While some basic troubleshooting steps like checking for loose connections can be done by a novice, diagnosing and repairing code P11BE may require advanced automotive knowledge and specialized tools, making it best suited for professional mechanics.

10. Is OBDII code P11BE a common issue in Buick vehicles?

Code P11BE related to the O2 Reference Voltage Circuit for NOx Sensor 2 may not be as common as some other OBDII codes, but it can still occur in Buick vehicles, especially in models equipped with NOx sensors.