AutoCodes – Chevrolet – P22FA 2014 Chevrolet Silverado

P22FA 2014 Chevrolet Silverado Code - NOx Sensor 1 Performance Slow Response High To Low

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, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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: P22FA 2014 Chevrolet Silverado indicates NOx Sensor 1 Performance Slow Response High To Low.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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 322

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 P22FA 2014 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 P22FA 2014 Chevrolet Silverado - NOx Sensor 1 Performance Slow Response High To Low - AutoCodes.com — P22FA 2014 Chevrolet Silverado Code - NOx Sensor 1 Performance Slow Response High To Low

What does this mean?

What are the Possible Causes of the DTC P22FA 2014 Chevrolet Silverado?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P22FA 2014 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 P22FA 2014 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 P22FA 2014 Chevrolet Silverado code?

Need more information on how to fix the P22FA 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22FA 2014 Chevrolet Silverado 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 P22FA 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22FA on a 2014 Chevrolet Silverado?

- Common symptoms include poor engine performance, reduced fuel efficiency, and illuminated Check Engine Light.

2. What can cause the OBDII code P22FA NOx Sensor 1 Performance Slow Response High to Low on a 2014 Chevrolet Silverado?

- The code may be triggered by a faulty NOx sensor, issues with the NOx sensor wiring, or problems with the engine control module.

3. How serious is the OBDII code P22FA NOx Sensor 1 Performance Slow Response High to Low on a 2014 Chevrolet Silverado?

- While the vehicle may still be operable, it is important to address this issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

4. Can I continue driving my 2014 Chevrolet Silverado with the OBDII code P22FA active?

- It is generally not recommended to continue driving with this code active, as it can lead to decreased fuel efficiency and potential long-term engine issues.

5. What are some repair tips for fixing the OBDII code P22FA on a 2014 Chevrolet Silverado?

- Check the wiring and connectors of the NOx sensor for any damage, corrosion, or loose connections. If necessary, replace the NOx sensor to address the slow response issue.

6. How do I reset the Check Engine Light after repairing the OBDII code P22FA on my 2014 Chevrolet Silverado?

- You can reset the Check Engine Light using an OBDII scanner or by disconnecting the car's battery for a few minutes. If the issue is properly fixed, the light should stay off.

7. Can a DIY enthusiast fix the OBDII code P22FA on a 2014 Chevrolet Silverado?

- While some basic troubleshooting like checking connections can be done by DIYers, diagnosing and replacing the NOx sensor may require advanced tools and expertise best handled by a professional mechanic.

8. How much does it typically cost to repair the OBDII code P22FA NOx Sensor 1 Performance Slow Response High to Low on a 2014 Chevrolet Silverado?

- The cost can vary depending on the cause of the issue and the labor rates in your area. Replacing a NOx sensor can range from $200 to $500, including parts and labor.

9. Are there any recalls or technical service bulletins related to the OBDII code P22FA on a 2014 Chevrolet Silverado?

- It is advisable to check with a Chevrolet dealership or online resources for any relevant recalls or technical service bulletins related to this specific OBDII code.

10. How often should I have the NOx sensor checked to prevent the OBDII code P22FA from occurring on my 2014 Chevrolet Silverado?

- Regular maintenance checks, such as during scheduled services or when experiencing related symptoms, can help catch any potential issues with the NOx sensor early and prevent the code from appearing.