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P22A0 2015 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 2015 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 328

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 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 P22A0 2015 Chevrolet Silverado - NOx Sensor 2 Circuit Low Voltage - AutoCodes.com — P22A0 2015 Chevrolet Silverado Code - NOx Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P22A0 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 P22A0 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 P22A0 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 P22A0 2015 Chevrolet Silverado code?

Need more information on how to fix the P22A0 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A0 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 P22A0 2015 Chevrolet Silverado Code

1. What does the OBDII code P22A0 mean on a 2015 Chevrolet Silverado?

P22A0 indicates a "NOx Sensor 2 Circuit Low Voltage" issue, which means the downstream nitrogen oxide (NOx) sensor is detecting an abnormally low voltage signal.

2. What are the common symptoms of code P22A0 on a 2015 Chevrolet Silverado?

Symptoms may include the check engine light turning on, reduced engine performance, poor fuel efficiency, or the vehicle entering limp mode.

3. What causes the P22A0 code to appear on a 2015 Chevrolet Silverado?

Common causes include a faulty NOx sensor, damaged sensor wiring or connectors, an exhaust leak near the sensor, or a malfunctioning engine control module (ECM).

4. Can I drive my 2015 Chevrolet Silverado with the P22A0 code?

Driving with this code is not recommended, as it can affect engine performance and emissions compliance. Prolonged driving may cause further damage.

5. How do I troubleshoot the P22A0 code on a 2015 Chevrolet Silverado?

Start by inspecting the NOx sensor wiring and connectors for damage or corrosion. Test the sensor voltage output with a multimeter and check for exhaust leaks near the sensor.

6. Do I need to replace the NOx sensor to fix the P22A0 code?

Not always. While a faulty sensor is a common cause, the issue could also stem from wiring problems, exhaust leaks, or ECM issues. Proper diagnosis is essential.

7. How much does it cost to repair the P22A0 code on a 2015 Chevrolet Silverado?

The cost can range from $200 to $600 depending on whether you need to replace the NOx sensor, repair wiring, or address other related issues.

8. Can a bad NOx sensor cause engine performance issues?

Yes, a faulty NOx sensor can lead to poor engine performance, reduced fuel economy, and increased emissions.

9. Is the P22A0 code related to emissions control?

Yes, the NOx sensor monitors nitrogen oxide emissions, which are regulated to ensure compliance with environmental standards.

10. How can I prevent the P22A0 code from recurring on my 2015 Chevrolet Silverado?

Regular maintenance, including inspecting exhaust system components and ensuring wiring and sensors are in good condition, can help prevent this code from recurring.