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P22FE 2017 Chevrolet Silverado 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 Chevrolet Silverado 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 725
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P22FE 2017 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 P22FE 2017 Chevrolet Silverado - NOx Sensor 2 Performance - Sensing Element - AutoCodes.com
P22FE 2017 Chevrolet Silverado Code - NOx Sensor 2 Performance - Sensing Element
What does this mean?

What are the Possible Causes of the DTC P22FE 2017 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 P22FE 2017 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 P22FE 2017 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 P22FE 2017 Chevrolet Silverado code?

Need more information on how to fix the P22FE 2017 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 P22FE 2017 Chevrolet Silverado Code

1. What does the OBDII code P22FE mean on a 2017 Chevrolet Silverado?

P22FE indicates an issue with the performance of the NOx Sensor 2's sensing element, which monitors nitrogen oxide levels in the exhaust system.

2. What are the symptoms of code P22FE on a 2017 Chevrolet Silverado?

Common symptoms include a check engine light, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.

3. What causes the P22FE code to appear on a 2017 Chevrolet Silverado?

Possible causes include a faulty NOx Sensor 2, wiring or connector issues, exhaust leaks, or software calibration problems.

4. Can driving with code P22FE damage my 2017 Chevrolet Silverado?

Yes, ignoring this code can lead to increased emissions, potential damage to the catalytic converter, and reduced engine performance.

5. How do I diagnose the P22FE code in my 2017 Chevrolet Silverado?

Use an OBDII scanner to confirm the code, inspect the NOx Sensor 2 and its wiring for damage, check for exhaust leaks, and verify the proper operation of the exhaust system.

6. How can I fix the P22FE code on my 2017 Chevrolet Silverado?

Repairs may involve replacing the NOx Sensor 2, repairing damaged wiring or connectors, addressing exhaust leaks, or reprogramming the vehicle’s ECU.

7. What is NOx Sensor 2 in a 2017 Chevrolet Silverado?

NOx Sensor 2 is a downstream sensor located after the selective catalytic reduction (SCR) system, responsible for monitoring nitrogen oxide levels in the exhaust.

8. How much does it cost to fix the P22FE code on a 2017 Chevrolet Silverado?

Repair costs vary, but replacing the NOx sensor typically ranges from $300 to $600, including parts and labor.

9. Can a faulty NOx sensor cause other codes on a 2017 Chevrolet Silverado?

Yes, a malfunctioning NOx sensor can trigger additional emissions-related codes or issues with the SCR system.

10. Is a software update necessary to resolve the P22FE code?

In some cases, a software update for the engine control module (ECM) may be required to address calibration issues related to the NOx sensor.

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