AutoCodes – Chevrolet – P11DC Chevrolet

P11DC Chevrolet Code - NOx Sensor 2 Current Performance

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: P11DC Chevrolet indicates NOx Sensor 2 Current Performance.
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 7,679

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 P11DC 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 P11DC Chevrolet - NOx Sensor 2 Current Performance - AutoCodes.com — P11DC Chevrolet Code - NOx Sensor 2 Current Performance

What does this mean?

What are the Possible Causes of the DTC P11DC 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 P11DC 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 P11DC 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 P11DC Chevrolet code?

Need more information on how to fix the P11DC Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11DC Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P11DC 2014 Chevrolet Silverado — NOx Sensor 2 Current Performance
P11DC 2015 Chevrolet Silverado — NOx Sensor 2 Current Performance
P11DC 2016 Chevrolet Silverado — NOx Sensor 2 Current Performance
P11DC 2017 Chevrolet Silverado — NOx Sensor 2 Current Performance
P11DC 2018 Chevrolet Silverado — NOx Sensor 2 Current Performance

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 P11DC Chevrolet Code

1. What are common symptoms of OBDII code P11DC in a Chevrolet related to NOx Sensor 2 Current Performance?

The common symptoms include decreased engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of the P11DC OBDII code in a Chevrolet, specifically related to NOx Sensor 2 Current Performance?

Possible causes may include a faulty NOx sensor, issues with the NOx sensor wiring, exhaust system problems, or an engine control module (ECM) issue.

3. How can I diagnose the P11DC OBDII code in a Chevrolet related to NOx Sensor 2 Current Performance?

Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the NOx sensor and its wiring for damage, and checking the exhaust system for leaks or other issues.

4. What are the repair options for resolving the P11DC OBDII code in a Chevrolet due to NOx Sensor 2 Current Performance?

Repair options may include replacing the faulty NOx sensor, repairing any damaged wiring, fixing exhaust system issues, or reprogramming the ECM.

5. Can I drive my Chevrolet with the P11DC OBDII code related to NOx Sensor 2 Current Performance?

It is not recommended to drive the vehicle with this code present, as it may lead to further damage and reduced performance. It is advised to address the issue promptly.

6. Are there any DIY tips for addressing the P11DC OBDII code in a Chevrolet caused by NOx Sensor 2 Current Performance?

While some minor checks like inspecting wiring connections can be done by DIY enthusiasts, it is recommended to seek professional help for accurate diagnosis and repair of this complex issue.

7. How much does it typically cost to repair the P11DC OBDII code in a Chevrolet related to NOx Sensor 2 Current Performance?

The cost can vary depending on the specific cause of the issue, but repairs for NOx sensor-related problems can range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a faulty NOx sensor cause other issues in a Chevrolet besides triggering the P11DC OBDII code?

Yes, a faulty NOx sensor can lead to increased emissions, failed emissions tests, and potentially affect the overall performance and efficiency of the vehicle.

9. Is it necessary to reset the OBDII system after repairing the P11DC code in a Chevrolet related to NOx Sensor 2 Current Performance?

Yes, it is important to clear the fault code and reset the OBDII system after making repairs to ensure the issue has been resolved and the check engine light does not reappear.

10. How can I prevent the recurrence of the P11DC OBDII code in a Chevrolet related to NOx Sensor 2 Current Performance?

Regular maintenance, checking for exhaust leaks, and addressing any engine performance issues promptly can help prevent the reoccurrence of this code in the future.