AutoCodes – GMC – P22F9 2016 GMC Sierra

P22F9 2016 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 2016 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 265

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 2016 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 2016 GMC Sierra - NOx Sensor 1 Performance Slow Response Low To High - AutoCodes.com — P22F9 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra code?

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

Need Help with the Code?

Get the P22F9 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P22F9 in a 2016 GMC Sierra?

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

2. What can cause the OBDII code P22F9 to trigger in a 2016 GMC Sierra?

The code P22F9 is usually triggered due to a slow response from NOx Sensor 1, indicating a problem with the sensor's performance.

3. How serious is the OBDII code P22F9 in a 2016 GMC Sierra?

While the code may not cause immediate harm to the vehicle, it can lead to higher emissions and potential long-term damage if left unresolved.

4. Can driving with the OBDII code P22F9 in a 2016 GMC Sierra damage the vehicle?

Continued driving with the P22F9 code may result in higher emissions and decreased fuel efficiency, which can impact the overall performance of the vehicle over time.

5. What are some possible repair tips for resolving the OBDII code P22F9 in a 2016 GMC Sierra?

Inspecting the NOx Sensor 1 for any signs of damage or contamination, checking the wiring connections, and performing a reset of the engine control module are common repair steps.

6. How much does it typically cost to repair the OBDII code P22F9 in a 2016 GMC Sierra?

The cost of repairing the P22F9 code can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can I reset the check engine light after fixing the OBDII code P22F9 in a 2016 GMC Sierra?

Yes, you can reset the check engine light using an OBDII scanner after resolving the issue triggering the P22F9 code. This will clear the code and turn off the warning light.

8. How can I prevent the OBDII code P22F9 from reoccurring in my 2016 GMC Sierra?

Regularly maintaining the NOx sensors, following the manufacturer's recommended service schedule, and using high-quality diesel fuel can help prevent the code from reoccurring.

9. Is it safe to continue driving the 2016 GMC Sierra with the check engine light on due to the OBDII code P22F9?

While it may be safe to drive the vehicle for a short period with the code triggered, it is advisable to have the issue diagnosed and repaired promptly to avoid potential long-term damage or performance issues.

10. How long does it typically take to repair the OBDII code P22F9 in a 2016 GMC Sierra?

The repair time for the P22F9 code can vary based on the specific diagnosis and parts availability, but it may take anywhere from a few hours to a full day to complete the necessary repairs.