AutoCodes – GMC – P11FE 2016 GMC Sierra

P11FE 2016 GMC Sierra Code - O2 Low Reference Circuit High 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: P11FE 2016 GMC Sierra indicates O2 Low Reference Circuit High 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 126

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 P11FE 2016 GMC Sierra 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 P11FE 2016 GMC Sierra - O2 Low Reference Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11FE 2016 GMC Sierra Code - O2 Low Reference Circuit High Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11FE 2016 GMC Sierra?

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 P11FE 2016 GMC Sierra?

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 P11FE 2016 GMC Sierra 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 P11FE 2016 GMC Sierra 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 P11FE 2016 GMC Sierra Code

What does the OBDII code P11FE mean for a 2016 GMC Sierra?

The P11FE code refers to an issue with the "O2 Low Reference Circuit High Voltage" for NOx Sensor 2, indicating an abnormal voltage in the low reference circuit.

What are the common symptoms of the P11FE code in a 2016 GMC Sierra?

Symptoms may include an illuminated Check Engine Light, reduced fuel efficiency, poor engine performance, and possible limp mode activation.

What causes the P11FE code to appear in a 2016 GMC Sierra?

The code is typically caused by a faulty NOx sensor, damaged or corroded wiring, poor electrical connections, or issues with the vehicle's engine control module (ECM).

Can a faulty NOx sensor trigger the P11FE code?

Yes, a malfunctioning NOx sensor can cause the P11FE code by sending incorrect voltage signals to the ECM.

How can I diagnose the P11FE code on my 2016 GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion, testing the NOx sensor with a multimeter, and using a scan tool to monitor live data for the sensor.

Is it safe to drive with the P11FE code on a 2016 GMC Sierra?

Driving with this code is not recommended, as it may lead to reduced engine performance, increased emissions, or further damage to the vehicle.

How do I fix the P11FE code on my 2016 GMC Sierra?

Repairs may involve replacing the NOx sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the ECM if necessary.

What tools are needed to troubleshoot the P11FE code?

You will need an OBDII scan tool, a multimeter for electrical testing, and possibly a repair manual for the specific wiring diagram.

How much does it cost to repair the P11FE code in a 2016 GMC Sierra?

The cost can vary but typically ranges from $200 to $700, depending on whether the NOx sensor needs replacement or if additional electrical repairs are required.

Can a software update fix the P11FE code on a GMC Sierra?

In some cases, a reflash or update to the ECM software may resolve the issue if it is caused by a programming fault.