AutoCodes – Chevrolet – P22F9 2018 Chevrolet Silverado

P22F9 2018 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 2018 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.

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Code Popularity 319

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
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Code P22F9 2018 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 2018 Chevrolet Silverado - NOx Sensor 1 Performance Slow Response Low To High - AutoCodes.com — P22F9 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P22F9 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22F9 2018 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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22F9 in a 2018 Chevrolet Silverado?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P22F9 in a 2018 Chevrolet Silverado?

- The code P22F9 typically indicates a slow response from NOx Sensor 1, which can be caused by issues such as sensor malfunction, wiring problems, or exhaust system issues.

3. How serious is OBDII code P22F9 in a 2018 Chevrolet Silverado?

- While the vehicle may still be operable with this code, it is important to address it promptly to prevent potential damage to the engine or emissions system.

4. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P22F9?

- It is generally not recommended to continue driving with a persistent check engine light, as it can lead to further issues and potentially affect the vehicle's performance.

5. How can I diagnose OBDII code P22F9 in my 2018 Chevrolet Silverado?

- A proper diagnosis typically involves using a diagnostic scanner to retrieve the code, inspecting the NOx Sensor 1 and its wiring, and checking for any exhaust system leaks or malfunctions.

6. What is the repair process for OBDII code P22F9 in a 2018 Chevrolet Silverado?

- The repair process may involve replacing the NOx Sensor 1, repairing any damaged wiring, fixing exhaust system issues, and clearing the trouble code from the vehicle's computer.

7. Is it possible to reset OBDII code P22F9 in a 2018 Chevrolet Silverado without fixing the underlying issue?

- While you can clear the code temporarily, it is not recommended as the underlying problem will persist, potentially leading to further issues down the line.

8. How much does it cost to repair OBDII code P22F9 in a 2018 Chevrolet Silverado?

- The cost of repairing this code can vary depending on the specific issue, but it may involve expenses for parts and labor, with an average range between $200 to $500.

9. Can a DIY enthusiast fix OBDII code P22F9 in a 2018 Chevrolet Silverado?

- While some aspects of the repair may be DIY-friendly, diagnosing and repairing NOx sensor issues often require specialized tools and expertise, so it is recommended to consult a professional mechanic.

10. How can I prevent OBDII code P22F9 from recurring in my 2018 Chevrolet Silverado?

- Regular maintenance, such as checking the exhaust system for leaks, monitoring sensor performance, and addressing any engine issues promptly, can help prevent the reoccurrence of this code.