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P22A6 2018 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 2018 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.

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Code Popularity 261

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 P22A6 2018 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 2018 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Circuit - AutoCodes.com — P22A6 2018 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC P22A6 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P22A6 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A6 2018 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 2018 Chevrolet Silverado Code

1. What does the OBDII code P22A6 for a 2018 Chevrolet Silverado mean?

The OBDII code P22A6 indicates an issue with the NOx Sensor 2 Heater Feedback Circuit.

2. What are common symptoms of a P22A6 code on a 2018 Chevrolet Silverado?

Common symptoms include the Check Engine light illuminating, reduced engine performance, and potential failed emissions testing.

3. What are possible causes of the P22A6 NOx Sensor 2 Heater Feedback Circuit fault on a 2018 Chevrolet Silverado?

Possible causes include a faulty NOx sensor, damaged wiring or connectors, a blown fuse, or issues with the sensor heater circuit.

4. How can I diagnose the P22A6 code on my 2018 Chevrolet Silverado?

Diagnosing the P22A6 code typically involves using an OBDII scanner to retrieve the code, checking the sensor and its connections for damage, and testing the sensor heater circuit for proper function.

5. Can I continue driving my 2018 Chevrolet Silverado with a P22A6 code?

It is not recommended to continue driving with a P22A6 code, as it can lead to increased emissions, reduced fuel efficiency, and potential engine damage if left unresolved.

6. How do I repair a P22A6 NOx Sensor 2 Heater Feedback Circuit issue on my 2018 Chevrolet Silverado?

Repairing a P22A6 code may involve replacing the faulty NOx sensor, repairing damaged wiring or connectors, checking and replacing fuses if necessary, and clearing the code from the vehicle's computer.

7. Can I fix the P22A6 code on my 2018 Chevrolet Silverado myself?

While some DIY enthusiasts may be able to diagnose and repair a P22A6 code, it is recommended to consult a professional mechanic for a proper diagnosis and repair to ensure the issue is resolved correctly.

8. How much does it cost to repair a P22A6 NOx Sensor 2 Heater Feedback Circuit fault on a 2018 Chevrolet Silverado?

The cost of repairing a P22A6 code can vary depending on the underlying issue, parts needed, and labor costs. It is advisable to obtain quotes from repair shops for an accurate estimate.

9. Will resetting the OBDII codes clear the P22A6 fault code on my 2018 Chevrolet Silverado?

Resetting the OBDII codes may temporarily clear the P22A6 fault code, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again.

10. How important is it to address a P22A6 NOx Sensor 2 Heater Feedback Circuit fault on a 2018 Chevrolet Silverado?

It is crucial to address a P22A6 fault code promptly to ensure proper engine performance, emissions compliance, and overall vehicle health. Ignoring the issue can lead to more significant problems down the line.