AutoCodes – Chevrolet – P22FE Chevrolet

P22FE Chevrolet 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 Chevrolet 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 10,093

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 P22FE Chevrolet 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 Chevrolet - NOx Sensor 2 Performance - Sensing Element - AutoCodes.com — P22FE Chevrolet Code - NOx Sensor 2 Performance - Sensing Element

What does this mean?

What are the Possible Causes of the DTC P22FE Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P22FE Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P22FE 2014 Chevrolet Silverado — NOx Sensor 2 Performance - Sensing Element
P22FE 2015 Chevrolet Silverado — NOx Sensor 2 Performance - Sensing Element
P22FE 2016 Chevrolet Silverado — NOx Sensor 2 Performance - Sensing Element
P22FE 2017 Chevrolet Silverado — NOx Sensor 2 Performance - Sensing Element
P22FE 2018 Chevrolet Silverado — NOx Sensor 2 Performance - Sensing Element

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 Chevrolet Code

What does the OBDII code P22FE mean on a Chevrolet?

P22FE indicates a performance issue with NOx Sensor 2 (downstream NOx sensor), specifically related to the sensing element's functionality.

What are the common symptoms of the P22FE code?

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

What causes the P22FE code to appear on a Chevrolet?

Common causes include a faulty NOx sensor, wiring or connector issues, soot or contamination on the sensor, or software calibration problems.

Can I drive my Chevrolet with the P22FE code active?

Driving with this code is not recommended as it may lead to increased emissions, reduced performance, and potential damage to other components in the emissions system.

How do I diagnose the P22FE code?

Diagnosis involves scanning for additional codes, inspecting the NOx sensor wiring and connectors, checking the sensor for contamination, and testing its response using a diagnostic tool.

How do I fix the P22FE code on my Chevrolet?

Repairs may include replacing the faulty NOx sensor, cleaning soot buildup, repairing wiring or connectors, or performing a software update.

What is the role of NOx Sensor 2 in a Chevrolet?

NOx Sensor 2 monitors nitrogen oxide levels in the exhaust after treatment to ensure the emissions system is functioning effectively.

How much does it cost to fix a P22FE code?

Repair costs can range from $200 to $600 or more, depending on whether the sensor, wiring, or other components need replacement.

Can a dirty or clogged DEF system cause the P22FE code?

Yes, a malfunctioning DEF (Diesel Exhaust Fluid) system can impact NOx sensor readings and trigger the P22FE code.

Will replacing the NOx sensor always fix the P22FE code?

Not necessarily. While replacing the sensor often resolves the issue, you should first rule out wiring problems, contamination, or software issues to avoid unnecessary repairs.