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P11FD 2016 Chevrolet Silverado Code - O2 Low Reference Circuit Low Voltage (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
P11FD 2016 Chevrolet Silverado indicates O2 Low Reference Circuit Low Voltage (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 257
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 P11FD 2016 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 P11FD 2016 Chevrolet Silverado - O2 Low Reference Circuit Low Voltage (NOx Sensor 2) - AutoCodes.com
P11FD 2016 Chevrolet Silverado Code - O2 Low Reference Circuit Low Voltage (NOx Sensor 2)
What does this mean?

What are the Possible Causes of the DTC P11FD 2016 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 P11FD 2016 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 P11FD 2016 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 P11FD 2016 Chevrolet Silverado code?

Need more information on how to fix the P11FD 2016 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 P11FD 2016 Chevrolet Silverado Code

What does OBDII code P11FD mean for a 2016 Chevrolet Silverado?

The P11FD code indicates an issue with the O2 low reference circuit, specifically low voltage detected in NOx Sensor 2.

What are the common symptoms of a P11FD code?

Symptoms may include the check engine light turning on, reduced fuel efficiency, increased emissions, or poor engine performance.

What causes the P11FD code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connections in the O2 low reference circuit, or a malfunctioning engine control module (ECM).

Can I drive my Silverado with a P11FD code?

While the vehicle may still be driveable, it’s not recommended as it may lead to increased emissions, reduced performance, and potential damage to other components.

How is the P11FD code diagnosed?

Technicians typically use an OBDII scanner to confirm the code, inspect the NOx sensor and wiring, and test the low reference circuit for voltage irregularities.

What is the role of NOx Sensor 2 in the 2016 Chevrolet Silverado?

NOx Sensor 2 monitors nitrogen oxide levels in the exhaust system to ensure emissions compliance and optimal engine performance.

How can I fix a P11FD code on my Silverado?

Repairs may involve replacing the NOx Sensor 2, repairing or replacing damaged wiring, or addressing ECM-related issues if necessary.

How much does it cost to fix a P11FD code?

Repair costs can vary but typically range between $300 and $700, depending on whether the NOx sensor or wiring needs to be replaced.

What tools are needed to fix the P11FD code?

Common tools include an OBDII scanner, a multimeter for testing wiring, and basic hand tools for sensor replacement.

Could a software update resolve the P11FD code?

In some cases, a software update for the ECM may address the issue, but this depends on the specific circumstances and diagnostic results.

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