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P11C8 2015 Chevrolet Silverado Code - NOx Sensor 2 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 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: P11C8 2015 Chevrolet Silverado indicates NOx Sensor 2 Heater Ground Circuit High.
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 218

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 P11C8 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 P11C8 2015 Chevrolet Silverado - NOx Sensor 2 Heater Ground Circuit High - AutoCodes.com — P11C8 2015 Chevrolet Silverado Code - NOx Sensor 2 Heater Ground Circuit High

What does this mean?

What are the Possible Causes of the DTC P11C8 2015 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 P11C8 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 P11C8 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 P11C8 2015 Chevrolet Silverado code?

Need more information on how to fix the P11C8 2015 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 P11C8 2015 Chevrolet Silverado Code

What does the OBDII code P11C8 mean for a 2015 Chevrolet Silverado?

P11C8 indicates an issue with the NOx Sensor 2 Heater Ground Circuit, specifically that the circuit is showing a high voltage condition.

What are the symptoms of the P11C8 code in a 2015 Chevrolet Silverado?

Common symptoms include the check engine light turning on, reduced fuel efficiency, diminished engine performance, or issues with emissions control.

What causes the P11C8 code in a 2015 Chevrolet Silverado?

The code is typically caused by a faulty NOx sensor, damaged wiring or connectors, corrosion on the ground circuit, or a failure in the sensor's heater element.

Can I drive my 2015 Chevrolet Silverado with the P11C8 code?

While you may be able to drive the vehicle, prolonged operation with this code can lead to increased emissions, reduced fuel efficiency, and potential damage to other components.

How do I diagnose the P11C8 code on a 2015 Chevrolet Silverado?

Start by inspecting the wiring and connectors for damage or corrosion, test the NOx sensor heater circuit for continuity, and check for proper grounding in the circuit.

How is the P11C8 code repaired in a 2015 Chevrolet Silverado?

Repairs may include replacing the NOx sensor, repairing or replacing damaged wiring or connectors, or addressing any grounding issues in the heater circuit.

What tools are needed to fix the P11C8 code?

You'll need a diagnostic scanner to verify the code, a multimeter to test the circuit, and potentially basic tools like pliers and screwdrivers for wiring repairs.

How much does it cost to repair the P11C8 code on a 2015 Chevrolet Silverado?

Repair costs vary depending on the cause but can range from $200 to $600 for parts and labor, with the NOx sensor being the most expensive component.

Can a failing NOx sensor damage my 2015 Chevrolet Silverado?

Yes, a failing NOx sensor can impact the engine's performance and emissions system, potentially causing long-term damage if not addressed.

Is the P11C8 code covered under warranty for a 2015 Chevrolet Silverado?

It depends on the warranty coverage, but emissions-related components like the NOx sensor may be covered under the vehicle's emissions warranty. Check with your dealership.