AutoCodes – GMC – P22A3 2014 GMC Sierra

P22A3 2014 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 2014 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 176

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2014 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 2014 GMC Sierra - NOx Sensor 2 Heater Control Circuit - AutoCodes.com — P22A3 2014 GMC Sierra Code - NOx Sensor 2 Heater Control Circuit

What does this mean?

What are the Possible Causes of the DTC P22A3 2014 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 2014 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 2014 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 2014 GMC Sierra code?

Need more information on how to fix the P22A3 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A3 2014 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 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P22A3 in a 2014 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

The common symptoms include the illumination of the Check Engine Light, decreased fuel efficiency, and potential issues with emissions control.

2. What causes the OBDII code P22A3 in a 2014 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

The code P22A3 is typically triggered by a malfunction in the NOx Sensor 2 heater control circuit, which can be caused by wiring issues, a faulty sensor, or an issue with the vehicle's onboard computer system.

3. How can I diagnose the OBDII code P22A3 in my 2014 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

Diagnosing the issue involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connections related to the NOx Sensor 2 heater, and potentially testing the sensor itself for proper functionality.

4. Can I continue driving my 2014 GMC Sierra with the OBDII code P22A3 related to NOx Sensor 2 Heater Control Circuit?

It is not recommended to ignore the P22A3 code, as it can lead to increased emissions, reduced fuel efficiency, and potential damage to the vehicle's emissions control system. It is advisable to address the issue promptly.

5. How can I repair the OBDII code P22A3 in my 2014 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

Repairing the issue may involve replacing the NOx Sensor 2 heater, repairing any damaged wiring or connectors, or resetting the vehicle's onboard computer system to clear the fault code.

6. Is it possible to reset the OBDII code P22A3 in my 2014 GMC Sierra related to NOx Sensor 2 Heater Control Circuit without fixing the underlying issue?

While you can clear the fault code temporarily by resetting the vehicle's computer, the Check Engine Light is likely to reappear if the root cause of the problem is not addressed.

7. How much does it cost to fix the OBDII code P22A3 in a 2014 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

The cost of fixing the P22A3 code can vary depending on the specific issue causing it, but it may involve parts and labor expenses ranging from $200 to $500 or more at a dealership or repair shop.

8. Can a DIY enthusiast repair the OBDII code P22A3 in a 2014 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

DIY enthusiasts with a good understanding of automotive systems and access to the necessary tools may be able to diagnose and address the issue themselves, but it is recommended to consult a professional if unsure.

9. Are there any recalls or technical service bulletins related to the OBDII code P22A3 in a 2014 GMC Sierra?

It's advisable to check with a GMC dealership or the manufacturer's website to see if there are any recalls or technical service bulletins related to the P22A3 code in your specific vehicle, as there may be relevant information or assistance available.

10. How long does it typically take to repair the OBDII code P22A3 in a 2014 GMC Sierra related to NOx Sensor 2 Heater Control Circuit?

The repair time can vary depending on the exact cause of the issue and the complexity of the repair, but it may take anywhere from a few hours to a full day to diagnose and fix the problem properly.