AutoCodes – GMC – P11DC 2014 GMC Sierra

P11DC 2014 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 2014 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 217

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 2014 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 2014 GMC Sierra - NOx Sensor 2 Current Performance - AutoCodes.com — P11DC 2014 GMC Sierra Code - NOx Sensor 2 Current Performance

What does this mean?

What are the Possible Causes of the DTC P11DC 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code

1. What are common symptoms of OBDII code P11DC in a 2014 GMC Sierra related to NOx Sensor 2?

The common symptoms include reduced engine performance, poor fuel efficiency, and potentially increased emissions.

2. What are the possible causes of OBDII code P11DC in a 2014 GMC Sierra?

The code P11DC is typically triggered by issues such as a faulty NOx Sensor 2, wiring problems, or a malfunctioning sensor heater.

3. How can I diagnose the cause of OBDII code P11DC in my 2014 GMC Sierra?

Diagnosing the issue involves using a diagnostic scanner to retrieve the specific fault code, testing the NOx Sensor 2, inspecting the wiring for damage, and checking the sensor heater operation.

4. Can I continue driving my 2014 GMC Sierra with OBDII code P11DC?

It is not recommended to drive your vehicle with a persistent P11DC code, as it can lead to further damage and potentially fail emission tests.

5. How can I repair OBDII code P11DC in my 2014 GMC Sierra?

Repair options include replacing the NOx Sensor 2, repairing any damaged wiring, or addressing any issues with the sensor heater to resolve the code.

6. Will resetting the OBDII system clear the P11DC code in my 2014 GMC Sierra?

While clearing the code may temporarily turn off the check engine light, it is crucial to address the underlying issue causing the P11DC code to prevent it from reoccurring.

7. How much does it cost to fix OBDII code P11DC in a 2014 GMC Sierra?

The cost of fixing the P11DC code can vary depending on the specific issue, but it typically involves replacing the NOx Sensor 2, which can range from $200 to $500 including labor.

8. How often does the NOx Sensor 2 need to be replaced in a 2014 GMC Sierra?

The NOx Sensor 2 may need replacement every 80,000 to 100,000 miles or earlier if symptoms of failure, such as triggering the P11DC code, are present.

9. Can a DIY enthusiast replace the NOx Sensor 2 in a 2014 GMC Sierra to fix OBDII code P11DC?

While it is technically possible for a skilled DIYer to replace the NOx Sensor 2, it is recommended to have a professional technician perform the repair due to the complexity involved.

10. Does the OBDII code P11DC in a 2014 GMC Sierra affect vehicle safety?

While the P11DC code itself does not directly impact vehicle safety, addressing the underlying issue promptly is essential to prevent potential engine performance issues and ensure proper emission control.