AutoCodes – Chevrolet – P11C6 Chevrolet

P11C6 Chevrolet Code - NOx Sensor 1 Heater Ground Circuit High

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, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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: P11C6 Chevrolet indicates NOx Sensor 1 Heater Ground Circuit High.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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 556

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11C6 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 P11C6 Chevrolet - NOx Sensor 1 Heater Ground Circuit High - AutoCodes.com — P11C6 Chevrolet Code - NOx Sensor 1 Heater Ground Circuit High

What does this mean?

What are the Possible Causes of the DTC P11C6 Chevrolet?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P11C6 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 P11C6 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 P11C6 Chevrolet code?

Need more information on how to fix the P11C6 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C6 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P11C6 2014 Chevrolet Silverado — NOx Sensor 1 Heater Ground Circuit High
P11C6 2015 Chevrolet Silverado — NOx Sensor 1 Heater Ground Circuit High
P11C6 2016 Chevrolet Silverado — NOx Sensor 1 Heater Ground Circuit High
P11C6 2017 Chevrolet Silverado — NOx Sensor 1 Heater Ground Circuit High
P11C6 2018 Chevrolet Silverado — NOx Sensor 1 Heater Ground Circuit High

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 P11C6 Chevrolet Code

1. What are the common symptoms of OBDII code P11C6 in a Chevrolet related to NOx Sensor 1 Heater Ground Circuit High?

- Common symptoms include the Check Engine Light turning on, reduced engine performance, and potential increase in emissions.

2. What are the possible causes of OBDII code P11C6 indicating a NOx Sensor 1 Heater Ground Circuit High in a Chevrolet?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors, a short circuit, or issues with the ECM.

3. How can I diagnose the root cause of OBDII code P11C6 in my Chevrolet, specifically related to the NOx Sensor 1 Heater Ground Circuit High?

- Use a diagnostic scanner to retrieve the code, inspect the NOx sensor and its connections for damage, and perform a thorough check of the wiring harness.

4. Is it safe to continue driving my Chevrolet with the OBDII code P11C6 related to NOx Sensor 1 Heater Ground Circuit High illuminated?

- It is not recommended to drive for an extended period with this code active, as it can lead to increased emissions and potential engine performance issues.

5. Can I reset the OBDII code P11C6 in my Chevrolet myself, or do I need to visit a mechanic?

- You can attempt to reset the code using an OBDII scanner, but it's essential to address the underlying issue causing the fault code to prevent it from reoccurring.

6. What are the typical repair options for resolving OBDII code P11C6 related to the NOx Sensor 1 Heater Ground Circuit High in a Chevrolet?

- Repair options may include replacing the NOx sensor, repairing damaged wiring or connectors, addressing any short circuits, or reprogramming the ECM.

7. How much does it cost to fix OBDII code P11C6 in a Chevrolet due to NOx Sensor 1 Heater Ground Circuit High?

- The cost of repair can vary depending on the specific issue, but it may range from a few hundred to a thousand dollars, including parts and labor.

8. Are there any preventative maintenance tips to avoid encountering OBDII code P11C6 related to NOx Sensor 1 Heater Ground Circuit High in my Chevrolet?

- Regularly inspecting and maintaining the NOx sensor, checking the wiring harness for damage, and ensuring proper electrical connections can help prevent this issue.

9. Can a DIY enthusiast with some automotive knowledge fix OBDII code P11C6 related to NOx Sensor 1 Heater Ground Circuit High in a Chevrolet?

- Depending on the exact cause, a DIY enthusiast may be able to address simpler issues like damaged connectors or wiring. However, more complex repairs may require professional assistance.

10. How urgent is it to address OBDII code P11C6 linked to NOx Sensor 1 Heater Ground Circuit High in a Chevrolet?

- It is advisable to address this issue promptly to prevent potential engine performance issues, increased emissions, and further damage to the vehicle's emissions control system.