AutoCodes – Chevrolet – P22F9 2015 Chevrolet Silverado

P22F9 2015 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 2015 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 205

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 P22F9 2015 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 2015 Chevrolet Silverado - NOx Sensor 1 Performance Slow Response Low To High - AutoCodes.com — P22F9 2015 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 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P22F9 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22F9 2015 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 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22F9 in a 2015 Chevrolet Silverado?

The common symptoms of OBDII code P22F9 in a 2015 Chevrolet Silverado may include reduced engine performance, decreased fuel efficiency, and an illuminated check engine light.

2. What are the possible causes of OBDII code P22F9 in a 2015 Chevrolet Silverado?

Possible causes of OBDII code P22F9 in a 2015 Chevrolet Silverado include a faulty NOx sensor, wiring issues, exhaust system leaks, or a problem with the engine control module.

3. How can I diagnose the OBDII code P22F9 in my 2015 Chevrolet Silverado?

Diagnosing OBDII code P22F9 in a 2015 Chevrolet Silverado typically involves using an OBDII scanner to read the code, inspecting the NOx sensor and related wiring, and checking for any exhaust system leaks.

4. Can I drive my 2015 Chevrolet Silverado with OBDII code P22F9?

It is not recommended to drive your 2015 Chevrolet Silverado with OBDII code P22F9 for an extended period as it may cause further damage to the vehicle and result in reduced performance.

5. How do I repair OBDII code P22F9 in my 2015 Chevrolet Silverado?

To repair OBDII code P22F9 in a 2015 Chevrolet Silverado, you may need to replace the NOx sensor, repair any wiring issues, fix exhaust leaks, or reprogram the engine control module.

6. Can a DIY enthusiast fix OBDII code P22F9 in a 2015 Chevrolet Silverado?

While some simple repairs like checking for loose connections or replacing a sensor may be done by a DIY enthusiast, diagnosing and repairing OBDII code P22F9 in a 2015 Chevrolet Silverado may require professional expertise.

7. How much does it cost to fix OBDII code P22F9 in a 2015 Chevrolet Silverado?

The cost to fix OBDII code P22F9 in a 2015 Chevrolet Silverado can vary depending on the exact cause of the issue, but it may range from a few hundred to a couple of thousand dollars for parts and labor.

8. Will resetting the check engine light resolve OBDII code P22F9 in my 2015 Chevrolet Silverado?

Simply resetting the check engine light will not resolve OBDII code P22F9 in a 2015 Chevrolet Silverado. The underlying issue causing the code needs to be diagnosed and repaired to prevent the light from coming back on.

9. How often does OBDII code P22F9 occur in a 2015 Chevrolet Silverado?

OBDII code P22F9, indicating NOx Sensor 1 Performance Slow Response Low To High, may occur infrequently in a 2015 Chevrolet Silverado, but it should be addressed promptly to avoid potential engine or emission system damage.

10. Is it safe to ignore OBDII code P22F9 in my 2015 Chevrolet Silverado?

Ignoring OBDII code P22F9 in a 2015 Chevrolet Silverado is not recommended as it can lead to decreased performance and fuel efficiency, as well as potential damage to the vehicle's emission control system.