AutoCodes – Chevrolet – P22A6 2016 Chevrolet Silverado

P22A6 2016 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback 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: P22A6 2016 Chevrolet Silverado indicates NOx Sensor 2 Heater Feedback 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.

Save to My Repairs My Repairs

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

Code Popularity 381

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 P22A6 2016 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 P22A6 2016 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Circuit - AutoCodes.com — P22A6 2016 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC P22A6 2016 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 P22A6 2016 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 P22A6 2016 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 P22A6 2016 Chevrolet Silverado code?

Need more information on how to fix the P22A6 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A6 2016 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 P22A6 2016 Chevrolet Silverado Code

1. What does OBDII code P22A6 for a 2016 Chevrolet Silverado NOx Sensor 2 Heater Feedback Circuit indicate?

The code P22A6 indicates a problem with the NOx Sensor 2 Heater Feedback Circuit in a 2016 Chevrolet Silverado.

2. What are common symptoms of a NOx Sensor 2 Heater Feedback Circuit issue in a 2016 Chevrolet Silverado?

Common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light on the dashboard.

3. What are possible causes of the P22A6 code in a 2016 Chevrolet Silverado?

Possible causes include a faulty NOx sensor, a malfunctioning heater circuit, wiring issues, or a problem with the vehicle's engine control module.

4. How can I diagnose a NOx Sensor 2 Heater Feedback Circuit problem in my 2016 Chevrolet Silverado?

Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the sensor and related wiring for damage, and testing the heater circuit for proper function.

5. Can I continue driving my 2016 Chevrolet Silverado with the P22A6 code present?

It is not recommended to continue driving with the P22A6 code present, as it can lead to further damage to the vehicle and potentially cause more severe issues over time.

6. How can I repair a NOx Sensor 2 Heater Feedback Circuit problem in my 2016 Chevrolet Silverado?

Repair options may include replacing the NOx sensor, repairing or replacing damaged wiring, or addressing any issues with the heater circuit as needed.

7. Is it possible to reset the P22A6 code in a 2016 Chevrolet Silverado without fixing the underlying issue?

While it is possible to clear the code temporarily, the underlying problem will persist, and the check engine light is likely to illuminate again until the issue is properly addressed.

8. Are there any maintenance tips to prevent future NOx Sensor 2 Heater Feedback Circuit issues in a 2016 Chevrolet Silverado?

Regularly scheduled maintenance, such as inspecting and replacing sensors as recommended by the manufacturer, can help prevent future NOx sensor-related problems in your Chevrolet Silverado.

9. Can a DIY enthusiast repair the NOx Sensor 2 Heater Feedback Circuit issue in a 2016 Chevrolet Silverado?

Depending on your level of automotive knowledge and experience, you may be able to address some aspects of the repair yourself, but complex issues may require professional assistance.

10. How much does it typically cost to repair a NOx Sensor 2 Heater Feedback Circuit problem in a 2016 Chevrolet Silverado?

The cost of repair can vary depending on the specific issue, parts needed, and labor rates, but it is advisable to obtain quotes from reputable mechanics or service centers for an accurate estimate.