AutoCodes – GMC – P22FE 2017 GMC Sierra

P22FE 2017 GMC Sierra Code - NOx Sensor 2 Performance - Sensing Element

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: P22FE 2017 GMC Sierra indicates NOx Sensor 2 Performance - Sensing Element.
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 260

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 P22FE 2017 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 P22FE 2017 GMC Sierra - NOx Sensor 2 Performance - Sensing Element - AutoCodes.com — P22FE 2017 GMC Sierra Code - NOx Sensor 2 Performance - Sensing Element

What does this mean?

What are the Possible Causes of the DTC P22FE 2017 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 P22FE 2017 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 P22FE 2017 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 P22FE 2017 GMC Sierra code?

Need more information on how to fix the P22FE 2017 GMC Sierra 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 P22FE 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P22FE in a 2017 GMC Sierra related to NOx Sensor 2 performance?

- Common symptoms may include reduced engine performance, decreased fuel efficiency, and illuminated Check Engine light.

2. What are the possible causes of OBDII code P22FE in a 2017 GMC Sierra indicating an issue with the NOx Sensor 2 sensing element?

- Potential causes can include a faulty NOx sensor, wiring issues, sensor circuit problems, or a malfunctioning sensing element.

3. How can I diagnose the OBDII code P22FE in my 2017 GMC Sierra related to NOx Sensor 2 performance?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific trouble code, inspecting the NOx sensor wiring and connections, and testing the sensor's functionality.

4. Can a DIY enthusiast repair OBDII code P22FE in a 2017 GMC Sierra caused by NOx Sensor 2 performance issues?

- While basic inspections and checks can be done by DIYers, repairing or replacing the NOx sensor or its sensing element may require specialized tools and expertise best handled by a professional mechanic.

5. Are there any quick tips to troubleshoot OBDII code P22FE in a 2017 GMC Sierra related to NOx Sensor 2 performance?

- Quick tips include checking for loose or damaged sensor connections, ensuring proper wiring integrity, and verifying the sensor's readings for anomalies.

6. What is the function of the NOx Sensor 2 sensing element in a 2017 GMC Sierra triggering OBDII code P22FE?

- The NOx Sensor 2 sensing element monitors the levels of nitrogen oxide (NOx) emissions in the vehicle's exhaust system, helping to ensure compliance with emissions regulations.

7. How urgent is it to address OBDII code P22FE in a 2017 GMC Sierra linked to NOx Sensor 2 performance issues?

- While the vehicle may still be operable with this code, it is important to address the underlying issue promptly to prevent potential damage to the engine or catalytic converter.

8. Can driving with OBDII code P22FE in a 2017 GMC Sierra related to NOx Sensor 2 performance cause further damage?

- Continuing to drive with this code unresolved may lead to increased emissions, reduced fuel efficiency, and possible harm to other emission control components in the long run.

9. How much does it typically cost to repair OBDII code P22FE in a 2017 GMC Sierra due to NOx Sensor 2 performance problems?

- Repair costs can vary based on the exact cause of the issue, but generally, replacing a faulty NOx sensor or sensing element can range from $200 to $600, including parts and labor.

10. Is it recommended to reset the Check Engine light after repairing OBDII code P22FE in a 2017 GMC Sierra related to NOx Sensor 2 performance?

- Yes, it is advisable to clear the trouble codes and reset the Check Engine light after resolving the NOx Sensor 2 performance issue to ensure proper monitoring of the vehicle's status.