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P22A7 2017 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 2017 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 461

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 P22A7 2017 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 2017 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Performance - AutoCodes.com — P22A7 2017 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Performance

What does this mean?

What are the Possible Causes of the DTC P22A7 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P22A7 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A7 2017 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 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A7 in a 2017 Chevrolet Silverado related to NOx Sensor 2 Heater Feedback Performance?

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

2. What are the possible causes of OBDII code P22A7 in a 2017 Chevrolet Silverado?

- Possible causes may include a faulty NOx sensor, issues with the sensor's wiring or connections, or a malfunction in the sensor's heating element.

3. How can I diagnose the NOx Sensor 2 Heater Feedback Performance issue in my 2017 Chevrolet Silverado?

- Diagnosing the problem typically involves using an OBDII scanner to read the trouble code, inspecting the sensor and its connections for any visible damage, and testing the sensor's functionality.

4. Can I continue driving my 2017 Chevrolet Silverado with OBDII code P22A7 present?

- It is not recommended to continue driving with this code present, as it can lead to further engine damage and reduced efficiency. It's best to address the issue promptly.

5. How can I repair OBDII code P22A7 related to NOx Sensor 2 Heater Feedback Performance in my 2017 Chevrolet Silverado?

- Repair may involve replacing the NOx sensor, repairing any damaged wiring or connections, or addressing issues with the sensor's heating element as needed.

6. Is it possible to reset the OBDII code P22A7 in a 2017 Chevrolet Silverado without fixing the underlying issue?

- While you can clear the code with an OBDII scanner, the underlying problem causing the code will likely persist and trigger the check engine light again.

7. Are there any maintenance tips to prevent OBDII code P22A7 in a 2017 Chevrolet Silverado?

- Regularly maintaining your vehicle, including checking the sensors and wiring, can help prevent issues like NOx sensor malfunctions that lead to this trouble code.

8. How much does it typically cost to repair OBDII code P22A7 in a 2017 Chevrolet Silverado at a mechanic or dealership?

- Repair costs can vary based on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can a DIY enthusiast with some automotive knowledge fix OBDII code P22A7 in a 2017 Chevrolet Silverado?

- Depending on the specific cause of the code, some DIY enthusiasts with the right tools and knowledge may be able to address the issue, especially if it involves simple tasks like sensor replacement or wiring repairs.

10. How long can I safely drive my 2017 Chevrolet Silverado with OBDII code P22A7 before getting it repaired?

- It's best to address the issue as soon as possible to prevent further damage to the vehicle. Driving with this code present for an extended period is not recommended.