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P22A3 2015 Chevrolet Silverado 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 Chevrolet Silverado 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 324

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 2015 Chevrolet Silverado 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 Chevrolet Silverado - NOx Sensor 2 Heater Control Circuit - AutoCodes.com — P22A3 2015 Chevrolet Silverado Code - NOx Sensor 2 Heater Control Circuit

What does this mean?

What are the Possible Causes of the DTC P22A3 2015 Chevrolet Silverado?

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 Chevrolet Silverado?

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 Chevrolet Silverado 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 Chevrolet Silverado code?

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

Need Help with the Code?

Get the P22A3 2015 Chevrolet Silverado 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 Chevrolet Silverado Code

1. What does OBDII code P22A3 for a 2015 Chevrolet Silverado indicate?

- This code refers to an issue with the NOx Sensor 2 Heater Control Circuit.

2. What are the common symptoms of a NOx Sensor 2 Heater Control Circuit problem?

- Common symptoms include poor engine performance, reduced fuel efficiency, and potential illumination of the Check Engine light.

3. What are the possible causes of the P22A3 fault code in a 2015 Chevrolet Silverado?

- Causes may include a faulty NOx sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning heater control circuit.

4. How can I diagnose a NOx Sensor 2 Heater Control Circuit issue in my Chevrolet Silverado?

- Diagnosing the problem may involve checking the sensor's wiring, connectors, and heater circuit for any visible damage, as well as using a scan tool to gather data from the sensor.

5. Can I still drive my Chevrolet Silverado with the P22A3 fault code?

- It is not recommended to drive the vehicle with this fault code present, as it can lead to further damage and potential safety risks.

6. How can I repair a NOx Sensor 2 Heater Control Circuit problem in my Silverado?

- Repairs may involve replacing the faulty NOx sensor, repairing damaged wiring or connectors, checking and replacing fuses if necessary, or addressing any issues with the heater control circuit.

7. Are there any DIY tips for fixing a P22A3 fault code in a 2015 Chevrolet Silverado?

- While some basic checks like inspecting wiring and connectors can be done by DIY enthusiasts, it is recommended to seek professional help for accurate diagnosis and repair of the issue.

8. How much does it typically cost to repair a NOx Sensor 2 Heater Control Circuit problem in a Chevrolet Silverado?

- Costs can vary depending on the extent of the issue, parts needed for replacement, and labor charges. It is advisable to get quotes from reputable mechanics or service centers.

9. What happens if the NOx Sensor 2 Heater Control Circuit problem is left untreated?

- Leaving the issue unresolved can lead to poor engine performance, increased emissions, and potential damage to other engine components over time.

10. Is the NOx Sensor 2 Heater Control Circuit problem covered under any warranties for a 2015 Chevrolet Silverado?

- Depending on the vehicle's warranty status and coverage, the repair for this issue may be covered under certain warranties. It's recommended to check with the manufacturer or dealership for more information.