AutoCodes – GMC – P22FA 2015 GMC Sierra

P22FA 2015 GMC Sierra Code - NOx Sensor 1 Performance Slow Response High To Low

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: P22FA 2015 GMC Sierra indicates NOx Sensor 1 Performance Slow Response High To Low.
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 171

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 P22FA 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 P22FA 2015 GMC Sierra - NOx Sensor 1 Performance Slow Response High To Low - AutoCodes.com — P22FA 2015 GMC Sierra Code - NOx Sensor 1 Performance Slow Response High To Low

What does this mean?

What are the Possible Causes of the DTC P22FA 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 P22FA 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 P22FA 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 P22FA 2015 GMC Sierra code?

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Need Help with the Code?

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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 P22FA 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P22FA in a 2015 GMC Sierra related to NOx Sensor 1 performance?

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

2. What are the potential causes of the P22FA code in a 2015 GMC Sierra NOx Sensor 1 performance issue?

- Possible causes include a faulty NOx sensor, wiring issues, exhaust system leaks, or a problem with the engine control module.

3. How can I diagnose the P22FA code in my 2015 GMC Sierra related to NOx Sensor 1 performance?

- Diagnosing the issue may require using an OBDII scanner to retrieve the specific fault codes, checking the wiring and connections to the NOx sensor, and performing a visual inspection of the exhaust system.

4. What are some repair tips for addressing the P22FA code in a 2015 GMC Sierra NOx Sensor 1 performance problem?

- Repair tips may include replacing the faulty NOx sensor, repairing any damaged wiring or connections, fixing exhaust leaks, and resetting the engine control module.

5. Can I continue driving my 2015 GMC Sierra with the P22FA code related to NOx Sensor 1 performance issue?

- It is not recommended to continue driving the vehicle with this fault code present, as it can lead to further damage to the engine and emissions system.

6. How much does it typically cost to repair the P22FA code in a 2015 GMC Sierra NOx Sensor 1 performance issue?

- The cost of repairs can vary depending on the specific cause of the issue, but it may range from a few hundred to a thousand dollars, including parts and labor.

7. Is it possible to reset the P22FA code in a 2015 GMC Sierra related to NOx Sensor 1 performance without making any repairs?

- While you can clear the fault code using an OBDII scanner, it is crucial to address the underlying issue to prevent further problems and ensure proper vehicle operation.

8. How often does the NOx sensor need to be replaced in a 2015 GMC Sierra to prevent the P22FA code from recurring?

- The NOx sensor typically does not need frequent replacement unless it fails or malfunctions, causing the P22FA code to reappear.

9. Are there any maintenance practices that can help prevent the P22FA code related to NOx Sensor 1 performance in a 2015 GMC Sierra?

- Regularly inspecting the exhaust system, checking for any signs of leaks, and following the manufacturer's recommended maintenance schedule can help prevent issues with the NOx sensor.

10. Can a DIY enthusiast with basic automotive knowledge attempt to fix the P22FA code in a 2015 GMC Sierra NOx Sensor 1 performance issue?

- Depending on the specific cause of the problem, some repairs related to the NOx sensor may be within reach for a DIY enthusiast, but more complex issues may require professional assistance.