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P22A0 2017 Chevrolet Silverado Code - NOx Sensor 2 Circuit Low Voltage

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: P22A0 2017 Chevrolet Silverado indicates NOx Sensor 2 Circuit Low Voltage.
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 462

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 P22A0 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 P22A0 2017 Chevrolet Silverado - NOx Sensor 2 Circuit Low Voltage - AutoCodes.com — P22A0 2017 Chevrolet Silverado Code - NOx Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P22A0 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 P22A0 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 P22A0 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 P22A0 2017 Chevrolet Silverado code?

Need more information on how to fix the P22A0 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A0 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 P22A0 2017 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A0 in a 2017 Chevrolet Silverado related to NOx Sensor 2 Circuit Low Voltage?

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

2. What are the possible causes of the NOx Sensor 2 Circuit Low Voltage code (P22A0) in a 2017 Chevrolet Silverado?

- Potential causes include a faulty NOx sensor, wiring issues, a defective sensor heater, or problems with the vehicle's engine control module.

3. How can I diagnose the NOx Sensor 2 Circuit Low Voltage issue in my 2017 Chevrolet Silverado?

- Diagnosis typically involves using an OBDII scanner to retrieve the trouble code, inspecting the sensor and its wiring for damage, and testing the sensor's voltage and resistance.

4. Can I continue driving my 2017 Chevrolet Silverado with the P22A0 code related to the NOx Sensor 2 Circuit Low Voltage?

- It is not recommended to continue driving with this code unresolved, as it can lead to increased emissions, potential damage to the catalytic converter, and further engine issues.

5. Is it possible to reset the OBDII code P22A0 in a 2017 Chevrolet Silverado without addressing the underlying issue?

- While you can temporarily clear the code with a scanner, the underlying problem causing the low voltage reading in the NOx sensor will persist and likely trigger the code again.

6. How much does it typically cost to repair the NOx Sensor 2 Circuit Low Voltage issue in a 2017 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the problem, but it may range from $200 to $500 including parts and labor.

7. Can I replace the NOx Sensor 2 in my 2017 Chevrolet Silverado myself, or should I seek professional help?

- While some experienced DIYers may be able to replace the sensor themselves, it is generally recommended to seek professional help to ensure proper diagnosis and installation.

8. Are there any preventive measures I can take to avoid the NOx Sensor 2 Circuit Low Voltage code in my 2017 Chevrolet Silverado?

- Regular maintenance, such as checking the sensor wiring for damage, keeping the engine well-tuned, and using quality fuel, can help prevent issues with the NOx sensor.

9. How long does it typically take to repair the NOx Sensor 2 Circuit Low Voltage issue in a 2017 Chevrolet Silverado?

- The repair time can vary depending on the exact cause of the problem and the availability of parts, but it generally takes a few hours to a full day at a repair shop.

10. Will replacing the NOx Sensor 2 in my 2017 Chevrolet Silverado fix the P22A0 code immediately, or are there additional steps required?

- Replacing the sensor may resolve the code, but it is recommended to clear the code, test drive the vehicle, and re-scan to ensure the issue is fully resolved.