AutoCodes – GMC – P22A7 2015 GMC Sierra

P22A7 2015 GMC Sierra Code - NOx Sensor 2 Heater Feedback Performance

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 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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: P22A7 2015 GMC Sierra indicates NOx Sensor 2 Heater Feedback Performance.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 270

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P22A7 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 P22A7 2015 GMC Sierra - NOx Sensor 2 Heater Feedback Performance - AutoCodes.com — P22A7 2015 GMC Sierra Code - NOx Sensor 2 Heater Feedback Performance

What does this mean?

What are the Possible Causes of the DTC P22A7 2015 GMC Sierra?

Faulty Nitrogen Oxides (NOx) Sensor 2
Nitrogen Oxides Sensor 2 harness is open or shorted
Nitrogen Oxides Sensor 2 circuit poor electrical connection

How to Fix the DTC P22A7 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 P22A7 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 P22A7 2015 GMC Sierra code?

Need more information on how to fix the P22A7 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A7 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 P22A7 2015 GMC Sierra Code

1. What are the common symptoms of an OBDII code P22A7 in a 2015 GMC Sierra related to NOx Sensor 2 Heater Feedback Performance?

The common symptoms include the Malfunction Indicator Lamp (MIL) or Check Engine Light coming on, decreased fuel efficiency, and potential issues with emissions.

2. What are the possible causes of the P22A7 code in a 2015 GMC Sierra related to NOx Sensor 2 Heater Feedback Performance?

Possible causes include a faulty NOx sensor, damaged wiring or connectors, a malfunctioning NOx sensor heater, or issues with the vehicle's powertrain control module.

3. How can I diagnose the P22A7 code in my 2015 GMC Sierra related to NOx Sensor 2 Heater Feedback Performance?

Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, checking the NOx sensor and its connections for any visible damage, and testing the sensor's heater circuit for proper functionality.

4. What are the repair options for fixing the P22A7 code in a 2015 GMC Sierra related to NOx Sensor 2 Heater Feedback Performance?

Repair options may include replacing the NOx sensor, repairing or replacing damaged wiring or connectors, fixing issues with the sensor's heater circuit, or reprogramming the powertrain control module.

5. Can I drive my 2015 GMC Sierra with an active P22A7 code related to NOx Sensor 2 Heater Feedback Performance?

It is generally not recommended to drive the vehicle with an active fault code, as it can lead to poor performance, reduced fuel efficiency, and potential emissions issues. It is best to address the problem promptly.

6. How much does it typically cost to repair a P22A7 code related to NOx Sensor 2 Heater Feedback Performance in a 2015 GMC Sierra?

The cost of repairs can vary depending on the specific issue causing the code, the labor rates in your area, and whether the vehicle is under warranty. Repairs for this type of code can range from a few hundred to over a thousand dollars.

7. Are there any preventative maintenance tips to avoid encountering the P22A7 code related to NOx Sensor 2 Heater Feedback Performance in a 2015 GMC Sierra?

Regularly servicing your vehicle, including checking for any fault codes, keeping up with recommended maintenance schedules, and addressing any issues promptly, can help prevent the occurrence of this code.

8. Can a DIY enthusiast with basic automotive skills repair the P22A7 code related to NOx Sensor 2 Heater Feedback Performance in a 2015 GMC Sierra?

While some basic troubleshooting and repairs may be possible for DIY enthusiasts, diagnosing and fixing issues related to NOx sensors and emissions systems often require specialized tools and knowledge. It is recommended to consult a professional mechanic for such repairs.

9. How long does it typically take to repair the P22A7 code related to NOx Sensor 2 Heater Feedback Performance in a 2015 GMC Sierra?

The repair time can vary depending on the specific cause of the code, the availability of parts, and the skill level of the technician. In general, repairs for this type of code can take anywhere from a few hours to a full day.

10. Is the P22A7 code related to NOx Sensor 2 Heater Feedback Performance a common issue in 2015 GMC Sierra vehicles?

While the P22A7 code related to NOx Sensor 2 Heater Feedback Performance may not be as common as some other codes, issues with NOx sensors and emissions systems can occur in vehicles over time. Regular maintenance and prompt attention to warning lights can help prevent such problems.