AutoCodes – GMC – P22FE 2018 GMC Sierra

P22FE 2018 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 2018 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 320

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P22FE 2018 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 2018 GMC Sierra - NOx Sensor 2 Performance - Sensing Element - AutoCodes.com — P22FE 2018 GMC Sierra Code - NOx Sensor 2 Performance - Sensing Element

What does this mean?

What are the Possible Causes of the DTC P22FE 2018 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 2018 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 2018 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 2018 GMC Sierra code?

Need more information on how to fix the P22FE 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22FE 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2018 GMC Sierra Code

1. What does the OBDII code P22FE mean on a 2018 GMC Sierra?

P22FE indicates an issue with the performance of the NOx (Nitrogen Oxide) Sensor 2's sensing element, typically located downstream in the exhaust system.

2. What are the common symptoms of code P22FE on a 2018 GMC Sierra?

Symptoms may include the Check Engine Light turning on, reduced fuel efficiency, decreased engine performance, or the vehicle entering limp mode.

3. What causes the P22FE code to appear on a 2018 GMC Sierra?

Common causes include a faulty NOx sensor, wiring or connector issues, excessive soot buildup on the sensor, or a malfunctioning exhaust system component.

4. Can I drive my 2018 GMC Sierra with the P22FE code?

Itâ€™s not recommended to drive for extended periods with this code, as it may lead to increased emissions, reduced performance, and potential damage to the exhaust system.

5. How do I fix the P22FE code on a 2018 GMC Sierra?

Repairs may involve inspecting and cleaning the NOx sensor, repairing damaged wiring, replacing the faulty NOx sensor, or addressing issues with the exhaust system.

6. How much does it cost to fix the P22FE code on a 2018 GMC Sierra?

Replacing the NOx sensor can cost between $300 and $600, including parts and labor, but costs may vary depending on the diagnosis and additional repairs needed.

7. Where is NOx Sensor 2 located on a 2018 GMC Sierra?

NOx Sensor 2 is typically located downstream in the exhaust system, after the catalytic converter.

8. Can a bad NOx sensor cause other problems on a 2018 GMC Sierra?

Yes, a bad NOx sensor can cause poor performance, increased emissions, and may lead to the vehicle going into limp mode.

9. How do I prevent the P22FE code from recurring on my 2018 GMC Sierra?

Regular maintenance, using high-quality fuel, and ensuring the exhaust system components are clean and functioning properly can help prevent this code.

10. Do I need to reset the code after repairing the NOx sensor issue?

Yes, after completing repairs, you should clear the code using an OBDII scanner to confirm the issue is resolved.