AutoCodes – Chevrolet – P11C6 2018 Chevrolet Silverado

P11C6 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 225

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 P11C6 2018 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 P11C6 2018 Chevrolet Silverado - NOx Sensor 1 Heater Ground Circuit High - AutoCodes.com — P11C6 2018 Chevrolet Silverado Code - NOx Sensor 1 Heater Ground Circuit High

What does this mean?

What are the Possible Causes of the DTC P11C6 2018 Chevrolet Silverado?

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 2018 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 P11C6 2018 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 P11C6 2018 Chevrolet Silverado code?

Need more information on how to fix the P11C6 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C6 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P11C6 in a 2018 Chevrolet Silverado related to the NOx Sensor 1 Heater Ground Circuit High?

- Common symptoms include the check engine light being illuminated, decreased fuel efficiency, and potential issues with the vehicle's emission control system.

2. What are the possible causes of the NOx Sensor 1 Heater Ground Circuit High code (P11C6) in a 2018 Chevrolet Silverado?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, a malfunctioning heater element in the sensor, or issues with the vehicle's computer system.

3. How serious is the OBDII code P11C6 related to the NOx Sensor 1 Heater Ground Circuit High in a 2018 Chevrolet Silverado?

- While the vehicle may still be driveable with this code, it is important to address the underlying issue promptly to prevent potential damage to the emission control system and ensure optimal vehicle performance.

4. Can I continue driving my 2018 Chevrolet Silverado with the NOx Sensor 1 Heater Ground Circuit High code (P11C6) illuminated?

- It is generally recommended to avoid prolonged driving with the check engine light on, as unresolved issues could lead to more severe problems over time. It's best to have the vehicle diagnosed and repaired as soon as possible.

5. How can I diagnose and repair the NOx Sensor 1 Heater Ground Circuit High code (P11C6) in my 2018 Chevrolet Silverado?

- Diagnosing and repairing this code typically involves inspecting the NOx sensor and its wiring for damage, testing the sensor's heater element, and checking the vehicle's computer system for any related faults. Professional diagnostic tools may be needed for an accurate assessment.

6. Is it possible to reset the OBDII code P11C6 related to the NOx Sensor 1 Heater Ground Circuit High in a 2018 Chevrolet Silverado without fixing the underlying issue?

- Resetting the code without addressing the root cause is not recommended, as the check engine light will likely reappear once the issue is detected again during vehicle operation. It's best to resolve the problem to ensure proper vehicle functionality.

7. Are there any DIY tips for resolving the NOx Sensor 1 Heater Ground Circuit High code (P11C6) in a 2018 Chevrolet Silverado?

- While basic troubleshooting such as checking for loose connections or damaged wiring may be attempted by DIY enthusiasts, diagnosing and repairing complex issues related to this code often require specialized knowledge and equipment best handled by a professional mechanic.

8. How much does it typically cost to repair the NOx Sensor 1 Heater Ground Circuit High code (P11C6) in a 2018 Chevrolet Silverado?

- Repair costs can vary depending on the extent of the issue, the need for replacement parts, and labor fees. It is advisable to obtain quotes from reputable repair shops or dealerships to determine the specific cost for your vehicle's situation.

9. Can a faulty NOx sensor cause other problems in a 2018 Chevrolet Silverado besides triggering the P11C6 code?

- Yes, a faulty NOx sensor can potentially impact the vehicle's emission levels, fuel efficiency, and overall engine performance. Addressing issues with the NOx sensor promptly can help maintain the vehicle's optimal operation.

10. Is it necessary to have the NOx Sensor 1 Heater Ground Circuit High code (P11C6) fixed immediately in a 2018 Chevrolet Silverado?

- While immediate action is not always critical, it is advisable to address the issue in a timely manner to prevent potential complications, ensure compliance with emission regulations, and maintain the vehicle's performance and efficiency.