AutoCodes – Chevrolet – P22A1 2018 Chevrolet Silverado

P22A1 2018 Chevrolet Silverado Code - NOx Sensor 2 Circuit High 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: P22A1 2018 Chevrolet Silverado indicates NOx Sensor 2 Circuit High 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 491

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 P22A1 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 P22A1 2018 Chevrolet Silverado - NOx Sensor 2 Circuit High Voltage - AutoCodes.com — P22A1 2018 Chevrolet Silverado Code - NOx Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A1 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 P22A1 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 P22A1 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 P22A1 2018 Chevrolet Silverado code?

Need more information on how to fix the P22A1 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A1 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 P22A1 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A1 (NOx Sensor 2 Circuit High Voltage) in a 2018 Chevrolet Silverado?

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

2. What could cause the NOx Sensor 2 Circuit High Voltage code in a 2018 Chevrolet Silverado?

- Potential causes include issues with the NOx sensor itself, wiring problems, a faulty sensor heater circuit, or an engine control module (ECM) issue.

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

- Diagnosis typically involves using an OBDII scanner to read the code, checking the sensor and its connections for visible damage, and testing the sensor's voltage and resistance.

4. Can driving with the P22A1 code present in a 2018 Chevrolet Silverado cause further damage?

- Continuing to drive with this code may lead to increased emissions, potential damage to the catalytic converter, and decreased engine performance over time.

5. What are some possible repair tips for fixing the NOx Sensor 2 Circuit High Voltage code in a 2018 Chevrolet Silverado?

- Repair options may include replacing the NOx sensor, repairing damaged wiring, addressing any ECM issues, or resetting the code after fixing the underlying problem.

6. Is it safe to continue driving my 2018 Chevrolet Silverado with the NOx Sensor 2 Circuit High Voltage code?

- It is generally not recommended to drive with this code active, as it can impact the vehicle's performance and emissions, potentially leading to more serious issues.

7. How much does it typically cost to repair the NOx Sensor 2 Circuit High Voltage issue in a 2018 Chevrolet Silverado?

- The cost of repairs can vary depending on the exact cause of the problem, but it may range from a couple of hundred dollars for a sensor replacement to more significant costs for complex repairs.

8. Can a DIY enthusiast fix the NOx Sensor 2 Circuit High Voltage problem in a 2018 Chevrolet Silverado?

- While some simple fixes like sensor replacement or basic wiring checks can be done by DIYers, diagnosing and repairing more complex issues may require professional assistance.

9. Will resetting the check engine light resolve the NOx Sensor 2 Circuit High Voltage code in a 2018 Chevrolet Silverado?

- Resetting the light without addressing the underlying problem will not fix the issue; it's essential to diagnose and repair the cause of the code to prevent it from reoccurring.

10. How often does the NOx Sensor 2 Circuit High Voltage code occur in 2018 Chevrolet Silverado vehicles?

- While the frequency may vary, this code can occur due to sensor or electrical issues and should be addressed promptly to maintain the vehicle's performance and emissions standards.