AutoCodes – Chevrolet – P22A6 Chevrolet

P22A6 Chevrolet 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 Chevrolet 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.

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Code Popularity 567

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

What does this mean?

What are the Possible Causes of the DTC P22A6 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P22A6 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P22A6 2014 Chevrolet Silverado — NOx Sensor 2 Heater Feedback Circuit
P22A6 2015 Chevrolet Silverado — NOx Sensor 2 Heater Feedback Circuit
P22A6 2016 Chevrolet Silverado — NOx Sensor 2 Heater Feedback Circuit
P22A6 2017 Chevrolet Silverado — NOx Sensor 2 Heater Feedback Circuit
P22A6 2018 Chevrolet Silverado — NOx Sensor 2 Heater Feedback Circuit

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 Chevrolet Code

1. What are common symptoms of OBDII code P22A6 related to the NOx Sensor 2 Heater Feedback Circuit?

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

2. What causes OBDII code P22A6 in a Chevrolet related to the NOx Sensor 2 Heater Feedback Circuit?

- The code is typically triggered by a malfunction in the NOx Sensor 2 heater feedback circuit, which can be caused by wiring issues, a faulty sensor, or a problem with the vehicle's ECM.

3. How can I diagnose OBDII code P22A6 for the NOx Sensor 2 Heater Feedback Circuit in my Chevrolet?

- Diagnosis involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connections related to the NOx sensor, and testing the sensor itself for proper functionality.

4. Can I drive my Chevrolet with OBDII code P22A6 related to the NOx Sensor 2 Heater Feedback Circuit?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential emissions issues. It's best to address the problem promptly.

5. How can I repair OBDII code P22A6 for the NOx Sensor 2 Heater Feedback Circuit in my Chevrolet?

- Repair options may include repairing or replacing damaged wiring, replacing the NOx sensor if it's faulty, or reprogramming the ECM if necessary to resolve the issue.

6. Are there any DIY tips for addressing OBDII code P22A6 related to the NOx Sensor 2 Heater Feedback Circuit?

- DIY enthusiasts can start by checking for loose or damaged wiring connections, ensuring proper sensor installation, and consulting the vehicle's service manual for detailed troubleshooting steps.

7. What are the potential long-term effects of ignoring OBDII code P22A6 related to the NOx Sensor 2 Heater Feedback Circuit?

- Ignoring this code can lead to increased emissions, reduced fuel efficiency, and potential damage to other emissions control components in the vehicle over time.

8. How much does it typically cost to repair OBDII code P22A6 for the NOx Sensor 2 Heater Feedback Circuit in a Chevrolet?

- The cost of repair can vary depending on the root cause of the issue, but it may range from $200 to $500 for parts and labor at a dealership or repair shop.

9. Can a faulty NOx sensor cause other OBDII codes to appear in addition to P22A6?

- Yes, a malfunctioning NOx sensor can sometimes trigger related codes such as P2201 or P2202, indicating issues with the sensor's performance or circuitry.

10. Is it possible to reset the check engine light after addressing OBDII code P22A6 for the NOx Sensor 2 Heater Feedback Circuit?

- Yes, once the underlying issue is resolved, the check engine light can be reset using an OBDII scanner to clear the trouble codes stored in the vehicle's ECM.