AutoCodes – GMC – P11DC 2015 GMC Sierra

P11DC 2015 GMC Sierra 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 2015 GMC Sierra 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 241

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 Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11DC 2015 GMC Sierra 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 2015 GMC Sierra - NOx Sensor 2 Current Performance - AutoCodes.com — P11DC 2015 GMC Sierra Code - NOx Sensor 2 Current Performance

What does this mean?

What are the Possible Causes of the DTC P11DC 2015 GMC Sierra?

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 2015 GMC Sierra?

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 2015 GMC Sierra 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 2015 GMC Sierra 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 P11DC 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P11DC in a 2015 GMC Sierra related to NOx Sensor 2 Current Performance?

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

2. What are the possible causes of OBDII code P11DC in a 2015 GMC Sierra, indicating an issue with NOx Sensor 2 Current Performance?

Potential causes include a faulty NOx sensor, wiring issues, exhaust system leaks, or issues with the engine control module.

3. How can I diagnose the underlying issue causing OBDII code P11DC in my 2015 GMC Sierra?

Diagnosis typically involves using an OBDII scanner to read the code, inspecting the NOx sensor and related wiring, checking for exhaust leaks, and testing the functionality of the sensor.

4. Can I continue driving my 2015 GMC Sierra with OBDII code P11DC related to NOx Sensor 2 Current Performance?

It is generally not recommended to drive the vehicle with this code present, as it can lead to further damage and reduced performance over time.

5. What are some repair tips for addressing OBDII code P11DC in a 2015 GMC Sierra?

Repair tips include checking and replacing the NOx sensor if faulty, repairing any damaged wiring, fixing exhaust leaks, and resetting the engine control module.

6. How much does it typically cost to repair OBDII code P11DC in a 2015 GMC Sierra involving NOx Sensor 2 Current Performance?

The cost of repair can vary depending on the specific issue, but it may range from $200 to $600 or more, including parts and labor.

7. Can resetting the check engine light resolve OBDII code P11DC in a 2015 GMC Sierra?

Resetting the check engine light may temporarily turn it off, but it will not fix the underlying issue causing the code related to NOx Sensor 2 Current Performance.

8. Are there any preventive maintenance steps to avoid OBDII code P11DC in a 2015 GMC Sierra?

Regularly servicing the vehicle, including checking the exhaust system, NOx sensor, and related components, can help prevent issues leading to this code.

9. Is it possible to clear OBDII code P11DC in a 2015 GMC Sierra without addressing the underlying problem with NOx Sensor 2 Current Performance?

Clearing the code without fixing the underlying issue will only temporarily remove the check engine light, as the problem will likely reoccur.

10. Can a DIY enthusiast repair OBDII code P11DC related to NOx Sensor 2 Current Performance in a 2015 GMC Sierra?

While some basic troubleshooting and repairs can be done by a skilled DIY enthusiast, addressing this specific code may require specialized tools and expertise, so professional help is often recommended.