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P22A3 2014 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 2014 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 233

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 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 2014 Chevrolet Silverado - NOx Sensor 2 Heater Control Circuit - AutoCodes.com — P22A3 2014 Chevrolet Silverado Code - NOx Sensor 2 Heater Control Circuit

What does this mean?

What are the Possible Causes of the DTC P22A3 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

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

Need Help with the Code?

Get the P22A3 2014 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 2014 Chevrolet Silverado Code

1. What does the OBDII code P22A3 on a 2014 Chevrolet Silverado indicate?

The code P22A3 specifically points to an issue with the NOx Sensor 2 Heater Control Circuit in the vehicle.

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

Common symptoms include poor engine performance, reduced fuel efficiency, and potentially failing emissions tests.

3. What can cause the P22A3 code to trigger in a 2014 Chevrolet Silverado?

The code P22A3 is often triggered by a faulty NOx sensor, damaged wiring or connectors, or a malfunctioning heater control circuit.

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

Diagnosing the problem typically involves using an OBDII scanner to read the specific error code, inspecting the sensor and related components for visible damage, and testing the circuit for continuity.

5. Is it safe to continue driving my Chevrolet Silverado with the P22A3 code present?

It is not recommended to drive the vehicle with the P22A3 code active, as it can lead to further damage and potential safety hazards.

6. Can I repair the NOx Sensor 2 Heater Control Circuit issue in my Chevrolet Silverado myself?

While some DIY enthusiasts may be able to address simple wiring or connector issues, it is often recommended to seek professional help for diagnosing and repairing NOx sensor and heater circuit problems.

7. How much does it typically cost to repair the NOx Sensor 2 Heater Control Circuit in a 2014 Chevrolet Silverado?

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

8. Are there any preventive maintenance tips to avoid triggering the P22A3 code in the future?

Regularly servicing your vehicle, checking for any signs of wear or damage in the sensor system, and promptly addressing any engine-related issues can help prevent the recurrence of the P22A3 code.

9. Can a faulty NOx Sensor 2 Heater Control Circuit affect the overall performance of my 2014 Chevrolet Silverado?

Yes, a malfunctioning NOx sensor can impact the vehicle's performance, fuel efficiency, and emissions output, resulting in reduced engine efficiency and potential drivability issues.

10. How long does it take to repair the NOx Sensor 2 Heater Control Circuit in a Chevrolet Silverado?

The repair time can vary based on the exact cause of the issue and the expertise of the technician, but typically, it may take a few hours to a full day to diagnose and repair the NOx sensor and heater control circuit problem.