AutoCodes – Chevrolet – P11C0 Chevrolet

P11C0 Chevrolet 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 Chevrolet 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 567

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

What does this mean?

What are the Possible Causes of the DTC P11C0 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

Need more information on how to fix the P11C0 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C0 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P11C0 2014 Chevrolet Silverado — O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)
P11C0 2015 Chevrolet Silverado — O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)
P11C0 2016 Chevrolet Silverado — O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)
P11C0 2017 Chevrolet Silverado — O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)
P11C0 2018 Chevrolet Silverado — O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)

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 Chevrolet Code

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

- Common symptoms may include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.

2. What are the potential causes of OBDII code P11C0 in a Chevrolet related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- Possible causes include a faulty NOx sensor, wiring issues in the O2 reference voltage circuit, or a problem with the engine control module (ECM).

3. How can I diagnose OBDII code P11C0 in a Chevrolet related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code, inspecting the NOx sensor and related wiring, and performing voltage tests.

4. Can I drive my Chevrolet with OBDII code P11C0 related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- It is generally not recommended to drive the vehicle with this code present, as it can lead to further engine issues and potential damage.

5. What are the repair options for fixing OBDII code P11C0 in a Chevrolet related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- Repair options may include replacing the NOx sensor, repairing or replacing damaged wiring, or reprogramming the ECM to address the issue.

6. How much does it typically cost to repair OBDII code P11C0 in a Chevrolet related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- Repair costs can vary depending on the specific cause of the code, but they may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any DIY tips for troubleshooting OBDII code P11C0 in a Chevrolet related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- DIY tips may include checking for loose or damaged wiring, ensuring proper sensor connections, and consulting the vehicle's service manual for specific troubleshooting steps.

8. How urgent is it to address OBDII code P11C0 related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2) in a Chevrolet?

- While the vehicle may still be operable with this code, it is recommended to address it promptly to prevent potential engine damage and ensure optimal performance.

9. Can a bad NOx sensor cause OBDII code P11C0 in a Chevrolet related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- Yes, a malfunctioning NOx sensor can trigger this trouble code by sending incorrect voltage signals to the ECM.

10. Is it necessary to reset the Check Engine Light after repairing OBDII code P11C0 in a Chevrolet related to the O2 Reference Voltage Circuit High Voltage (NOx Sensor 2)?

- It is recommended to reset the Check Engine Light using an OBDII scanner after addressing the underlying issue to ensure proper monitoring of the vehicle's systems.