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P11C0 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado 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 238
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P11C0 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado - O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) - AutoCodes.com
P11C0 2014 Chevrolet Silverado Code - O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)
What does this mean?

What are the Possible Causes of the DTC P11C0 2014 Chevrolet Silverado?

  • 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 2014 Chevrolet Silverado?

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 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P11C0 2014 Chevrolet Silverado 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 P11C0 2014 Chevrolet Silverado Code

1. What does the OBDII code P11C0 mean on a 2014 Chevrolet Silverado?

P11C0 indicates an issue with the O2 reference voltage circuit for NOx Sensor 2, specifically detecting a high voltage condition.

2. What causes the P11C0 code to appear on a 2014 Chevrolet Silverado?

Common causes include a faulty NOx sensor 2, damaged wiring or connectors in the O2 reference voltage circuit, or a malfunctioning engine control module (ECM).

3. What are the symptoms of the P11C0 code on a 2014 Chevrolet Silverado?

Symptoms may include the check engine light turning on, reduced engine performance, poor fuel efficiency, or issues with emissions system performance.

4. How do you diagnose a P11C0 code on a 2014 Chevrolet Silverado?

Diagnose by scanning the vehicle with an OBDII scanner, visually inspecting the wiring and connectors for damage, and testing the NOx sensor 2 and its reference voltage circuit for proper function.

5. Can you drive a 2014 Chevrolet Silverado with a P11C0 code?

While it may be possible to drive, it’s not recommended as it can lead to reduced performance, higher emissions, and potential damage to other components.

6. How do you fix the P11C0 code on a 2014 Chevrolet Silverado?

Repairs may include replacing the NOx sensor 2, repairing or replacing damaged wiring or connectors, updating the ECM software, or replacing the ECM if necessary.

7. What is the role of NOx Sensor 2 on a 2014 Chevrolet Silverado?

NOx Sensor 2 monitors nitrogen oxide levels in the exhaust and provides data to the ECM to optimize emissions control and engine performance.

8. How much does it cost to repair a P11C0 code on a 2014 Chevrolet Silverado?

Repair costs vary but typically range from $300 to $1,000, depending on whether just the sensor or additional components like wiring or the ECM need repair or replacement.

9. Can a bad NOx sensor cause a P11C0 code?

Yes, a malfunctioning NOx sensor 2 is one of the most common causes of the P11C0 code.

10. Will clearing the P11C0 code fix the issue on a 2014 Chevrolet Silverado?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.

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