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P22A7 2015 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Performance

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: P22A7 2015 Chevrolet Silverado indicates NOx Sensor 2 Heater Feedback Performance.
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 232

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 P22A7 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 P22A7 2015 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Performance - AutoCodes.com — P22A7 2015 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Performance

What does this mean?

What are the Possible Causes of the DTC P22A7 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 P22A7 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 P22A7 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 P22A7 2015 Chevrolet Silverado code?

Need more information on how to fix the P22A7 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A7 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 P22A7 2015 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P22A7 in a 2015 Chevrolet Silverado related to NOx Sensor 2 Heater Feedback Performance?

The common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P22A7 indicating NOx Sensor 2 Heater Feedback Performance mean in a 2015 Chevrolet Silverado?

This code indicates that there is a performance issue with the heater feedback system of the NOx Sensor 2 in the vehicle's emissions control system.

3. What are possible causes of OBDII code P22A7 in a 2015 Chevrolet Silverado?

Possible causes include a faulty NOx Sensor 2, a malfunctioning heater circuit, wiring issues, or a problem with the vehicle's engine control module.

4. How can I diagnose the source of OBDII code P22A7 in my 2015 Chevrolet Silverado related to NOx Sensor 2 Heater Feedback Performance?

Diagnosing this code typically involves using an OBDII scanner to retrieve the code, inspecting the NOx Sensor 2 and its heater circuit, checking for wiring faults, and testing the vehicle's engine control module.

5. Can I continue driving my 2015 Chevrolet Silverado with OBDII code P22A7 related to NOx Sensor 2 Heater Feedback Performance?

It is recommended to address the issue promptly to prevent further damage to the emissions control system and ensure optimal engine performance. Continued driving with this code may result in increased emissions and potential engine problems.

6. How can I repair OBDII code P22A7 in my 2015 Chevrolet Silverado related to NOx Sensor 2 Heater Feedback Performance?

Repairing this code may involve replacing the NOx Sensor 2, repairing the heater circuit, fixing any wiring issues, or reprogramming the engine control module.

7. Can I reset the check engine light after addressing OBDII code P22A7 in my 2015 Chevrolet Silverado?

Yes, once the underlying issue causing the code has been resolved, you can use an OBDII scanner to clear the code and reset the check engine light in your vehicle.

8. Will fixing OBDII code P22A7 in my 2015 Chevrolet Silverado improve fuel efficiency?

Addressing this code and ensuring proper functioning of the emissions control system, including the NOx Sensor 2 heater feedback, can help optimize fuel efficiency in your vehicle.

9. How often should I check the NOx Sensor 2 and related components in my 2015 Chevrolet Silverado to prevent OBDII code P22A7 issues?

Regular maintenance checks and inspections as part of your vehicle's service schedule can help prevent issues related to the NOx Sensor 2 heater feedback system and OBDII code P22A7.

10. Is it possible to prevent OBDII code P22A7 in my 2015 Chevrolet Silverado related to NOx Sensor 2 Heater Feedback Performance through routine maintenance?

Yes, routine maintenance, such as checking and replacing sensors as needed, inspecting wiring connections, and addressing any engine performance issues promptly, can help prevent the occurrence of OBDII code P22A7 in your vehicle.