AutoCodes – GMC – P22A3 2015 GMC Sierra

P22A3 2015 GMC Sierra Code - NOx Sensor 2 Heater Control Circuit

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: P22A3 2015 GMC Sierra indicates NOx Sensor 2 Heater Control Circuit.
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.

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Code Popularity 197

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 P22A3 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 P22A3 2015 GMC Sierra - NOx Sensor 2 Heater Control Circuit - AutoCodes.com — P22A3 2015 GMC Sierra Code - NOx Sensor 2 Heater Control Circuit

What does this mean?

What are the Possible Causes of the DTC P22A3 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 P22A3 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 P22A3 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 P22A3 2015 GMC Sierra code?

Need more information on how to fix the P22A3 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A3 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 P22A3 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P22A3 in a 2015 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

The common symptoms include illuminated Check Engine Light, poor engine performance, decreased fuel efficiency, and potential issues with passing emissions tests.

2. What are the possible causes of OBDII code P22A3 in a 2015 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

Potential causes include a faulty NOx sensor, damaged wiring or connectors in the heater control circuit, a blown fuse, or issues with the sensor's power supply.

3. How can I diagnose the NOx Sensor 2 Heater Control Circuit issue triggering OBDII code P22A3 in my 2015 GMC Sierra?

Diagnosis may involve using an OBDII scanner to retrieve the specific code, visually inspecting the sensor and its connections, checking for continuity in the heater circuit, and testing the sensor's resistance.

4. Can I drive my 2015 GMC Sierra with OBDII code P22A3 related to NOx Sensor 2 Heater Control Circuit?

It is generally not recommended to drive the vehicle with this code present, as it can lead to potential engine performance issues and may impact emissions compliance.

5. How can I repair OBDII code P22A3 in my 2015 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

Repair options may include replacing the NOx sensor, repairing or replacing damaged wiring or connectors, checking and replacing any blown fuses, or addressing issues with the sensor's power supply.

6. Are there any DIY tips for addressing OBDII code P22A3 in a 2015 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

While some simple tasks like checking and cleaning sensor connections can be done DIY, diagnosing and repairing electrical issues may require specialized tools and expertise best handled by a professional mechanic.

7. Can resetting the OBDII system clear the P22A3 code related to NOx Sensor 2 Heater Control Circuit in a 2015 GMC Sierra?

Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving cycles as the system runs diagnostic tests.

8. Is the NOx Sensor 2 Heater Control Circuit issue covered under any warranty for a 2015 GMC Sierra?

Depending on the vehicle's warranty status and coverage, the NOx sensor or related components may be covered under specific emissions or powertrain warranties provided by the manufacturer.

9. Are there any recalls related to OBDII code P22A3 in a 2015 GMC Sierra for NOx Sensor 2 Heater Control Circuit issues?

It's recommended to check with the nearest GMC dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to verify if there are any recalls related to this specific OBDII code in your vehicle.

10. How important is it to address OBDII code P22A3 related to NOx Sensor 2 Heater Control Circuit in a 2015 GMC Sierra promptly?

Addressing this code promptly is crucial to ensure optimal engine performance, fuel efficiency, and emissions compliance, as unresolved issues can potentially lead to more severe problems down the line.