AutoCodes – GMC – P11D0 2015 GMC Sierra

P11D0 2015 GMC Sierra Code - O2 Signal 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: P11D0 2015 GMC Sierra indicates O2 Signal 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 163

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 P11D0 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 P11D0 2015 GMC Sierra - O2 Signal Circuit (NOx Sensor 2) - AutoCodes.com — P11D0 2015 GMC Sierra Code - O2 Signal Circuit (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11D0 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 P11D0 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 P11D0 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 P11D0 2015 GMC Sierra code?

Need more information on how to fix the P11D0 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P11D0 2015 GMC Sierra Code

1. What does the OBDII code P11D0 mean on a 2015 GMC Sierra?

P11D0 indicates an issue with the O2 signal circuit for NOx Sensor 2, which monitors nitrogen oxide levels in the exhaust system.

2. What are the symptoms of code P11D0 on a 2015 GMC Sierra?

Common symptoms include the check engine light turning on, reduced fuel efficiency, poor engine performance, and possible limp mode activation.

3. What causes the P11D0 code to appear on a 2015 GMC Sierra?

Possible causes include a faulty NOx Sensor 2, damaged wiring or connectors in the O2 signal circuit, or a malfunctioning engine control module (ECM).

4. Can a bad NOx Sensor 2 cause drivability issues in a 2015 GMC Sierra?

Yes, a faulty NOx Sensor 2 can lead to poor engine performance, reduced fuel economy, and potential emissions system malfunctions.

5. How do you diagnose the P11D0 code on a 2015 GMC Sierra?

Diagnosis typically involves scanning for codes, inspecting the wiring and connectors for damage, testing the NOx sensor, and checking for proper ECM operation.

6. Can I drive my 2015 GMC Sierra with the P11D0 code?

While the vehicle may still be drivable, it is not recommended, as the issue could lead to increased emissions, poor performance, and potential damage to other components.

7. How do you fix the P11D0 code on a 2015 GMC Sierra?

Repairs may include replacing the NOx Sensor 2, repairing or replacing damaged wiring or connectors, or reprogramming the ECM if needed.

8. How much does it cost to fix the P11D0 code on a 2015 GMC Sierra?

Costs vary depending on the exact issue, but replacing a NOx sensor typically ranges from $300 to $700, including parts and labor.

9. Can a software update fix the P11D0 code on a 2015 GMC Sierra?

In some cases, an ECM software update may resolve the issue if the problem is related to incorrect programming.

10. What happens if the P11D0 code is ignored on a 2015 GMC Sierra?

Ignoring the code can lead to increased emissions, reduced fuel efficiency, worsening engine performance, and potential damage to the catalytic converter or other components.