AutoCodes – GMC – P11C0 2016 GMC Sierra

P11C0 2016 GMC Sierra Code - O2 Reference Voltage Circuit High Voltage (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: P11C0 2016 GMC Sierra indicates O2 Reference Voltage Circuit High Voltage (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 153

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 P11C0 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 P11C0 2016 GMC Sierra - O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11C0 2016 GMC Sierra Code - O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11C0 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 P11C0 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 P11C0 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 P11C0 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 P11C0 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P11C0 in a 2016 GMC Sierra related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- Common symptoms include the check engine light coming on, decreased fuel efficiency, and potential engine misfires.

2. What are the possible causes of OBDII code P11C0 in a 2016 GMC Sierra?

- Causes may include a faulty NOx sensor 2, a damaged wiring harness, issues with the powertrain control module (PCM), or problems with the sensor's reference voltage circuit.

3. How can I diagnose the O2 Reference Voltage Circuit High Voltage issue in my 2016 GMC Sierra?

- Diagnosing this problem typically involves using an OBDII scanner to retrieve the specific trouble code, inspecting the NOx sensor 2 and its wiring for damage, and testing the reference voltage circuit for proper operation.

4. Can I continue driving my 2016 GMC Sierra with OBDII code P11C0 present?

- While the vehicle may still be operable, it's recommended to address the issue promptly to prevent potential damage to the engine or emissions system.

5. What are some repair tips for resolving OBDII code P11C0 in a 2016 GMC Sierra?

- Repair tips may include checking and repairing any damaged wiring, replacing the NOx sensor 2 if necessary, ensuring proper connections, and clearing the trouble code with an OBDII scanner.

6. Is it possible to reset OBDII code P11C0 in a 2016 GMC Sierra without fixing the underlying issue?

- While you can clear the trouble code with an OBDII scanner, it's important to address the root cause of the problem to prevent the code from reappearing.

7. How much does it typically cost to repair OBDII code P11C0 in a 2016 GMC Sierra?

- The cost of repair can vary depending on the specific issue causing the code, but it may involve expenses for parts like a new NOx sensor 2 and labor for diagnostic testing and repairs.

8. Can a DIY enthusiast fix OBDII code P11C0 in a 2016 GMC Sierra, or is it best left to professionals?

- While some aspects of diagnosing and repairing this issue may be within reach for DIY enthusiasts, dealing with sensitive emissions components like the NOx sensor 2 may require specialized tools and expertise best left to professionals.

9. Are there any recalls or technical service bulletins related to OBDII code P11C0 in a 2016 GMC Sierra?

- It's advisable to check with GMC or a certified dealership to inquire about any relevant recalls or technical service bulletins that may pertain to this specific trouble code and model year.

10. How can I prevent OBDII code P11C0 from occurring in my 2016 GMC Sierra in the future?

- Regular maintenance, such as checking and replacing faulty sensors or damaged wiring promptly, following the manufacturer's recommended service schedule, and using quality fuel, can help prevent the recurrence of this trouble code.