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AutoCodes – Chevrolet – P11C8 2017 Chevrolet Silverado

P11C8 2017 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 2017 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 369
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P11C8 2017 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 2017 Chevrolet Silverado - NOx Sensor 2 Heater Ground Circuit High - AutoCodes.com
P11C8 2017 Chevrolet Silverado Code - NOx Sensor 2 Heater Ground Circuit High
What does this mean?

What are the Possible Causes of the DTC P11C8 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P11C8 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C8 2017 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 P11C8 2017 Chevrolet Silverado Code

1. What does the OBDII code P11C8 mean on a 2017 Chevrolet Silverado?

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

2. What are the symptoms of code P11C8 on a 2017 Chevrolet Silverado?

Common symptoms include the check engine light turning on, reduced fuel efficiency, potential limp mode, and increased emissions.

3. What causes code P11C8 to be triggered?

Possible causes include a faulty NOx sensor 2, damaged wiring or connectors in the sensor circuit, a blown fuse, or a malfunctioning engine control module (ECM).

4. Can I drive my 2017 Chevrolet Silverado with code P11C8?

While the truck may still be drivable, prolonged operation with this code can lead to increased emissions and potential damage to the aftertreatment system.

5. How do I fix code P11C8 on my Silverado?

Start by inspecting the wiring and connectors for damage or corrosion. Replace the NOx sensor 2 if faulty. If the issue persists, further diagnose the circuit or ECM.

6. How much does it cost to repair code P11C8?

Repair costs vary but can range from $200 to $600, depending on whether the NOx sensor needs replacement or if the issue is related to wiring or the ECM.

7. Where is NOx Sensor 2 located on a 2017 Chevrolet Silverado?

NOx Sensor 2 is typically located downstream in the exhaust system, after the selective catalytic reduction (SCR) system.

8. Can a bad NOx sensor cause other issues in my Silverado?

Yes, a malfunctioning NOx sensor can lead to increased emissions, poor engine performance, and potential damage to the exhaust aftertreatment system.

9. How do I test the NOx sensor 2 heater circuit?

Use a multimeter to check for proper voltage and continuity in the heater circuit. Refer to the vehicle’s service manual for specific test values.

10. Will clearing the code fix the problem?

Clearing the code may turn off the check engine light temporarily, but if the underlying issue is not resolved, the code will return.

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