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P11FC 2014 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 2014 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 222
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 2014 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 2014 Chevrolet Silverado - O2 Low Reference Circuit (NOx Sensor 2) - AutoCodes.com
P11FC 2014 Chevrolet Silverado Code - O2 Low Reference Circuit (NOx Sensor 2)
What does this mean?

What are the Possible Causes of the DTC P11FC 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P11FC 2014 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 2014 Chevrolet Silverado Code

1. What does the OBDII code P11FC mean for a 2014 Chevrolet Silverado?

P11FC indicates an issue with the low reference circuit of NOx Sensor 2, which monitors nitrogen oxide levels in the exhaust system.

2. What are the common symptoms of the P11FC code?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, or the truck entering a "limp mode."

3. What causes the P11FC code to appear?

Common causes include a faulty NOx Sensor 2, damaged wiring or connectors in the low reference circuit, or a malfunctioning Engine Control Module (ECM).

4. Can I drive my 2014 Chevrolet Silverado with the P11FC code?

Driving with this code is not recommended as it could lead to poor performance, higher emissions, and potential damage to the exhaust system.

5. How do I diagnose the P11FC code?

Start by inspecting the wiring and connectors for damage or corrosion, followed by testing the NOx Sensor 2 and its low reference circuit with a multimeter.

6. How is the P11FC code fixed?

Repairs typically involve replacing the faulty NOx Sensor 2, repairing damaged wiring, or reprogramming the ECM if needed.

7. How much does it cost to fix the P11FC code?

Depending on the specific issue, repairs can range from $200 to $500, with NOx sensor replacement being the most common expense.

8. Can a bad NOx sensor cause the P11FC code?

Yes, a malfunctioning NOx Sensor 2 is the most common reason for this code.

9. What tools are needed to repair the P11FC code?

You may need a diagnostic scanner, multimeter, and basic automotive tools to inspect and replace components.

10. Does the P11FC code affect emissions?

Yes, a faulty NOx sensor can lead to increased nitrogen oxide emissions, potentially causing the vehicle to fail an emissions test.

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