AutoCodes – GMC – P11DC 2016 GMC Sierra

P11DC 2016 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 2016 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 234

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 2016 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 2016 GMC Sierra - NOx Sensor 2 Current Performance - AutoCodes.com — P11DC 2016 GMC Sierra Code - NOx Sensor 2 Current Performance

What does this mean?

What are the Possible Causes of the DTC P11DC 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What does the OBDII code P11DC on a 2016 GMC Sierra NOx Sensor 2 Current Performance indicate?

This code indicates that there is a performance issue with NOx Sensor 2 on your GMC Sierra, specifically related to its current performance.

2. What are the common symptoms of a NOx Sensor 2 Current Performance issue in a 2016 GMC Sierra?

Common symptoms include reduced fuel efficiency, engine misfires, rough idling, and the illumination of the check engine light on the dashboard.

3. What are the possible causes of the P11DC OBDII code on a 2016 GMC Sierra related to NOx Sensor 2 Current Performance?

Potential causes include a faulty NOx sensor, wiring issues, sensor contamination, exhaust system problems, or issues with the vehicle's engine control module (ECM).

4. How can I diagnose a NOx Sensor 2 Current Performance problem on my 2016 GMC Sierra?

Diagnosis typically involves using an OBDII scanner to read the trouble codes, checking the sensor's wiring for damage, inspecting the sensor for physical damage or contamination, and testing the sensor's performance.

5. Can I drive my 2016 GMC Sierra with a P11DC code related to NOx Sensor 2 Current Performance?

It is not recommended to drive your vehicle with this code present, as it can lead to reduced performance, increased emissions, and potential engine damage if left unresolved.

6. How can I repair a NOx Sensor 2 Current Performance issue on my 2016 GMC Sierra?

Repair options include replacing the faulty NOx sensor, repairing any damaged wiring, cleaning the sensor if contaminated, and resetting the ECM to clear the trouble code.

7. Is it necessary to reset the OBDII code P11DC after repairing the NOx Sensor 2 issue on a 2016 GMC Sierra?

Yes, it is recommended to reset the trouble code using an OBDII scanner after completing any repairs related to the NOx Sensor 2 Current Performance problem.

8. What are the implications of ignoring the P11DC code related to NOx Sensor 2 Current Performance on a 2016 GMC Sierra?

Ignoring this code can lead to increased emissions, potential catalytic converter damage, decreased fuel efficiency, and possible engine performance issues over time.

9. Can a DIY enthusiast fix a NOx Sensor 2 Current Performance problem on a 2016 GMC Sierra?

While some basic diagnosis and repair steps can be performed by a DIY enthusiast, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair of NOx Sensor 2 issues.

10. How often does the NOx Sensor 2 Current Performance issue occur in a 2016 GMC Sierra?

The occurrence of this issue can vary depending on driving conditions, maintenance history, and other factors, but it is not uncommon in vehicles with high mileage or poor maintenance practices.