AutoCodes – Chevrolet – P11C6 2015 Chevrolet Silverado

P11C6 2015 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 2015 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 221

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 2015 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 2015 Chevrolet Silverado - NOx Sensor 1 Heater Ground Circuit High - AutoCodes.com — P11C6 2015 Chevrolet Silverado Code - NOx Sensor 1 Heater Ground Circuit High

What does this mean?

What are the Possible Causes of the DTC P11C6 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P11C6 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C6 2015 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 2015 Chevrolet Silverado Code

1. What does the P11C6 code mean on a 2015 Chevrolet Silverado?

The P11C6 code indicates an issue with the NOx Sensor 1 Heater Ground Circuit being high, meaning the sensor's heater circuit is not functioning correctly due to an electrical fault.

2. What are the symptoms of a P11C6 code in a 2015 Chevrolet Silverado?

Symptoms may include the check engine light turning on, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.

3. What causes the P11C6 code to appear?

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

4. How do you diagnose the P11C6 code on a Chevrolet Silverado?

Diagnosis involves using a scan tool to confirm the code, inspecting the NOx sensor wiring and connectors for damage, and testing the sensor's heater circuit for proper resistance.

5. Can I drive my 2015 Silverado with the P11C6 code active?

While the vehicle may still be drivable, driving with this code can lead to increased emissions, reduced performance, and potential damage to the emission system.

6. How do you fix the P11C6 code on a 2015 Chevrolet Silverado?

Repairs may include replacing the NOx sensor, repairing or replacing damaged wiring, or addressing issues with the ECM if necessary.

7. How much does it cost to fix the P11C6 code on a Silverado?

Repair costs can range from $200 to $600, depending on whether the NOx sensor needs replacement or if additional wiring repairs are required.

8. What tools are needed to troubleshoot the P11C6 code?

Youâ€™ll need an OBDII scan tool, a multimeter for testing electrical circuits, and potentially a wiring diagram for the NOx sensor system.

9. Can a faulty NOx sensor cause other problems in the Silverado?

Yes, a faulty NOx sensor can lead to poor fuel efficiency, higher emissions, and potential damage to the diesel particulate filter (DPF) or selective catalytic reduction (SCR) system.

10. How can I prevent the P11C6 code from recurring?

Regular maintenance, including inspecting and cleaning sensor connections, and using high-quality fuel to prevent buildup in the exhaust system, can help prevent this code.