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P22A6 2015 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 2015 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 181

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 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 P22A6 2015 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Circuit - AutoCodes.com — P22A6 2015 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC P22A6 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 P22A6 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 P22A6 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 P22A6 2015 Chevrolet Silverado code?

Need more information on how to fix the P22A6 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A6 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 P22A6 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A6 in a 2015 Chevrolet Silverado?

- Common symptoms include reduced engine performance, check engine light illumination, and potential failed emissions testing.

2. What does the OBDII code P22A6 indicate in a 2015 Chevrolet Silverado?

- The code P22A6 indicates an issue with the NOx Sensor 2 Heater Feedback Circuit in the 2015 Chevrolet Silverado.

3. What are the possible causes of OBDII code P22A6 in a 2015 Chevrolet Silverado?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors, a malfunctioning heater element, or issues with the vehicle's ECM.

4. How can I diagnose the OBDII code P22A6 in my 2015 Chevrolet Silverado?

- Diagnosis typically involves using an OBDII scanner to read the code, followed by inspecting the NOx sensor, checking the wiring and connectors for damage, and testing the heater element.

5. Is it safe to continue driving my 2015 Chevrolet Silverado with OBDII code P22A6?

- It is not recommended to continue driving with this code as it can lead to reduced engine performance and potential emissions issues.

6. Can I repair OBDII code P22A6 in my 2015 Chevrolet Silverado myself?

- Depending on your mechanical skills, you may be able to repair the issue yourself by replacing the NOx sensor, repairing damaged wiring, or addressing other possible causes.

7. How much does it typically cost to fix OBDII code P22A6 in a 2015 Chevrolet Silverado?

- The cost of fixing this code can vary depending on the exact cause, but it may range from $200 to $500 for parts and labor.

8. Will resetting the check engine light clear OBDII code P22A6 in my 2015 Chevrolet Silverado?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to return.

9. Can a faulty NOx sensor cause other problems in a 2015 Chevrolet Silverado?

- Yes, a faulty NOx sensor can lead to issues such as poor fuel efficiency, increased emissions, and potential damage to the vehicle's catalytic converter.

10. How often should the NOx sensors be inspected in a 2015 Chevrolet Silverado to prevent OBDII code P22A6?

- It is recommended to have the NOx sensors inspected during routine maintenance checks to catch any issues early and prevent the occurrence of code P22A6.