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P22A0 2018 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 2018 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 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)

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 P22A0 2018 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 2018 Chevrolet Silverado - NOx Sensor 2 Circuit Low Voltage - AutoCodes.com — P22A0 2018 Chevrolet Silverado Code - NOx Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P22A0 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P22A0 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A0 2018 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 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A0 in a 2018 Chevrolet Silverado?

The common symptoms of code P22A0 (NOx Sensor 2 Circuit Low Voltage) in a 2018 Chevrolet Silverado include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What could cause the NOx Sensor 2 Circuit to show low voltage in a 2018 Chevrolet Silverado?

Possible causes of the NOx Sensor 2 Circuit showing low voltage in a 2018 Chevrolet Silverado include a faulty NOx sensor, damaged wiring or connectors, issues with the powertrain control module (PCM), or exhaust system leaks.

3. How can I diagnose the NOx Sensor 2 Circuit low voltage issue in my 2018 Chevrolet Silverado?

To diagnose the NOx Sensor 2 Circuit low voltage problem in your 2018 Chevrolet Silverado, you can use an OBDII scanner to retrieve the specific fault code, visually inspect the sensor and its wiring for any visible damage, and perform voltage and resistance tests as per the manufacturer's guidelines.

4. Can I drive my 2018 Chevrolet Silverado with the P22A0 code (NOx Sensor 2 Circuit Low Voltage)?

It is not recommended to drive your 2018 Chevrolet Silverado with the P22A0 code as it can lead to potential engine damage and may cause the vehicle to fail emissions testing.

5. How do I repair the NOx Sensor 2 Circuit low voltage issue in my 2018 Chevrolet Silverado?

Repairing the NOx Sensor 2 Circuit low voltage problem in your 2018 Chevrolet Silverado may involve replacing the faulty NOx sensor, repairing or replacing damaged wiring or connectors, resetting the fault code with a scanner, and ensuring proper installation and calibration of the new sensor.

6. Is it possible to reset the P22A0 code (NOx Sensor 2 Circuit Low Voltage) in a 2018 Chevrolet Silverado without fixing the underlying issue?

While you can clear the P22A0 code temporarily by resetting the fault codes with an OBDII scanner, the check engine light is likely to come back on if the underlying issue causing the low voltage in the NOx Sensor 2 Circuit is not resolved.

7. How important is the NOx sensor in a 2018 Chevrolet Silverado?

The NOx sensor in a 2018 Chevrolet Silverado is crucial for monitoring and controlling the nitrogen oxide levels in the exhaust system to ensure compliance with emission regulations and optimize engine performance.

8. Can a DIY enthusiast replace the NOx sensor in a 2018 Chevrolet Silverado?

Replacing the NOx sensor in a 2018 Chevrolet Silverado may require specialized tools and knowledge, so it is recommended to have the replacement done by a qualified mechanic to ensure proper installation and calibration.

9. Are there any recalls related to the NOx sensor issue in 2018 Chevrolet Silverado models?

It's advisable to check with Chevrolet or the National Highway Traffic Safety Administration (NHTSA) for any recalls related to NOx sensor issues in 2018 Chevrolet Silverado models to see if your vehicle is affected.

10. How much does it typically cost to repair the NOx Sensor 2 Circuit low voltage issue in a 2018 Chevrolet Silverado?

The cost of repairing the NOx Sensor 2 Circuit low voltage issue in a 2018 Chevrolet Silverado can vary depending on the extent of the problem, parts needed, labor costs, and whether you choose to go to a dealership or an independent repair shop. It's best to get a few quotes from different service centers.