AutoCodes – Chevrolet – P22F9 2016 Chevrolet Silverado

P22F9 2016 Chevrolet Silverado Code - NOx Sensor 1 Performance Slow Response Low To High

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: P22F9 2016 Chevrolet Silverado indicates NOx Sensor 1 Performance Slow Response Low To High.
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.

Save to My Repairs My Repairs

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

Code Popularity 573

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 P22F9 2016 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 P22F9 2016 Chevrolet Silverado - NOx Sensor 1 Performance Slow Response Low To High - AutoCodes.com — P22F9 2016 Chevrolet Silverado Code - NOx Sensor 1 Performance Slow Response Low To High

What does this mean?

What are the Possible Causes of the DTC P22F9 2016 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 P22F9 2016 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 P22F9 2016 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 P22F9 2016 Chevrolet Silverado code?

Need more information on how to fix the P22F9 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22F9 2016 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 P22F9 2016 Chevrolet Silverado Code

1. What does the OBDII code P22F9 mean on a 2016 Chevrolet Silverado?

The P22F9 code indicates that the NOx Sensor 1 is showing a slow response when detecting nitrogen oxide levels, specifically when transitioning from low to high levels.

2. What are the symptoms of code P22F9 on a 2016 Chevrolet Silverado?

Common symptoms include a Check Engine Light, reduced fuel efficiency, decreased engine performance, and potential activation of limp mode.

3. What causes the P22F9 code on a 2016 Chevrolet Silverado?

The most common causes are a failing NOx Sensor 1, wiring or connector issues, exhaust leaks, or issues with the exhaust gas recirculation (EGR) system.

4. Can I drive my 2016 Chevrolet Silverado with the P22F9 code?

While the truck may still be drivable, ignoring the code can lead to reduced performance, higher emissions, and potential damage to other components over time.

5. How do I fix the P22F9 code on a 2016 Chevrolet Silverado?

Start by inspecting and repairing any damaged wiring or connectors to the NOx sensor. If that doesnâ€™t resolve the issue, replace the NOx Sensor 1 and clear the code.

6. How do I know if the NOx Sensor 1 needs replacement for the P22F9 code?

If the sensor shows slow response times even after checking for wiring issues and performing basic diagnostics, itâ€™s likely the sensor is faulty and needs replacement.

7. Can an exhaust leak cause the P22F9 code on a 2016 Chevrolet Silverado?

Yes, an exhaust leak can disrupt the NOx sensorâ€™s ability to measure gas levels accurately, potentially triggering the P22F9 code.

8. How much does it cost to fix the P22F9 code on a 2016 Chevrolet Silverado?

Repair costs vary, but replacing a NOx sensor typically ranges from $300 to $700, including parts and labor, depending on the shop and location.

9. Does the P22F9 code affect emissions testing?

Yes, a P22F9 code can cause your Silverado to fail an emissions test because the NOx sensor is critical for monitoring and controlling emissions output.

10. Can a software update fix the P22F9 code on a 2016 Chevrolet Silverado?

In some cases, a software update to the engine control module (ECM) might help if the issue is related to calibration, but this should only be attempted after diagnosing other potential causes.