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AutoCodes – Chevrolet – P11FC 2017 Chevrolet Silverado

P11FC 2017 Chevrolet Silverado Code - O2 Low Reference Circuit (NOx Sensor 2)

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
P11FC 2017 Chevrolet Silverado indicates O2 Low Reference Circuit (NOx Sensor 2).
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 191
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 P11FC 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 P11FC 2017 Chevrolet Silverado - O2 Low Reference Circuit (NOx Sensor 2) - AutoCodes.com
P11FC 2017 Chevrolet Silverado Code - O2 Low Reference Circuit (NOx Sensor 2)
What does this mean?

What are the Possible Causes of the DTC P11FC 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 P11FC 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 P11FC 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 P11FC 2017 Chevrolet Silverado code?

Need more information on how to fix the P11FC 2017 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 P11FC 2017 Chevrolet Silverado Code

1. What does the OBDII code P11FC mean on a 2017 Chevrolet Silverado?

The P11FC code indicates an issue with the O2 Low Reference Circuit for NOx Sensor 2, which monitors nitrogen oxide emissions.

2. What are the symptoms of code P11FC on a 2017 Chevrolet Silverado?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, and potential emission test failure.

3. What causes the P11FC code on a 2017 Chevrolet Silverado?

Common causes include a faulty NOx sensor 2, damaged wiring or connectors, or issues with the vehicle's ECM/PCM.

4. How do I fix the P11FC code on a 2017 Chevrolet Silverado?

Repair steps may involve inspecting and replacing the NOx sensor 2, repairing damaged wiring or connectors, or updating the ECM software.

5. Can I drive my 2017 Chevrolet Silverado with the P11FC code?

Driving with this code is not recommended as it can lead to increased emissions and potential damage to other components over time.

6. How much does it cost to repair the P11FC code on a Silverado?

Repair costs vary but typically range from $200 to $700, depending on whether the NOx sensor or wiring needs replacement.

7. How do I diagnose the P11FC code on my Silverado?

Diagnosis involves using an OBDII scanner, inspecting the NOx sensor 2 and wiring for damage, and verifying ECM functionality.

8. What does the NOx sensor 2 do on a 2017 Chevrolet Silverado?

NOx sensor 2 measures nitrogen oxide levels in the exhaust system to ensure compliance with emissions standards.

9. Will clearing the P11FC code fix the problem?

Clearing the code without addressing the underlying issue will only temporarily remove the check engine light, and the code is likely to return.

10. Is the P11FC code related to emissions?

Yes, the P11FC code is directly related to emissions as it involves the NOx sensor, which monitors nitrogen oxide levels.

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