AutoCodes – GMC – P22F9 2015 GMC Sierra

P22F9 2015 GMC Sierra 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 GMC Sierra 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 252

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 2015 GMC Sierra 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 GMC Sierra - NOx Sensor 1 Performance Slow Response Low To High - AutoCodes.com — P22F9 2015 GMC Sierra Code - NOx Sensor 1 Performance Slow Response Low To High

What does this mean?

What are the Possible Causes of the DTC P22F9 2015 GMC Sierra?

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 GMC Sierra?

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 GMC Sierra 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 GMC Sierra code?

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

Need Help with the Code?

Get the P22F9 2015 GMC Sierra 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 GMC Sierra Code

1. What are the common symptoms of OBDII code P22F9 in a 2015 GMC Sierra related to NOx Sensor 1 Performance Slow Response Low To High?

- Common symptoms include reduced engine performance, increased fuel consumption, and illuminated check engine light.

2. What can cause the OBDII code P22F9 to trigger in a 2015 GMC Sierra?

- The code P22F9 is often triggered by issues such as a faulty NOx sensor, wiring problems, or issues with the exhaust system.

3. How can I diagnose the cause of the OBDII code P22F9 in my 2015 GMC Sierra?

- Diagnosis involves inspecting the NOx sensor and its wiring, checking for exhaust leaks, and using a scan tool to monitor sensor data.

4. What are the possible repair options for resolving the OBDII code P22F9 in a 2015 GMC Sierra?

- Repair options include replacing the NOx sensor, repairing any damaged wiring, fixing exhaust leaks, and resetting the fault codes.

5. Can I continue driving my 2015 GMC Sierra with the OBDII code P22F9 related to NOx Sensor 1 Performance Slow Response Low To High?

- It is not recommended to drive your vehicle for an extended period with this fault code, as it can lead to increased emissions and potential engine damage.

6. How important is it to address the OBDII code P22F9 in a timely manner in a 2015 GMC Sierra?

- It is crucial to address this code promptly to ensure optimal engine performance, fuel efficiency, and compliance with emissions regulations.

7. Are there any maintenance tips to prevent the recurrence of the OBDII code P22F9 in a 2015 GMC Sierra?

- Regularly inspecting and maintaining the NOx sensor, exhaust system, and related components can help prevent the recurrence of this fault code.

8. Can a DIY enthusiast handle the repair of the OBDII code P22F9 in a 2015 GMC Sierra?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address this code by following repair guides and procedures.

9. Is there a specific reset procedure required after repairing the OBDII code P22F9 in a 2015 GMC Sierra?

- After repairing the issue causing the code P22F9, it is recommended to clear the fault codes using a scan tool to reset the system.

10. How can I ensure the proper functioning of the NOx sensor in my 2015 GMC Sierra to prevent future occurrences of the OBDII code P22F9?

- Regularly inspecting and testing the NOx sensor, as well as following the manufacturer's maintenance schedule, can help ensure its proper functioning and prevent future issues.