AutoCodes – Chevrolet – P22A1 2015 Chevrolet Silverado

P22A1 2015 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 2015 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 415

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 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 P22A1 2015 Chevrolet Silverado - NOx Sensor 2 Circuit High Voltage - AutoCodes.com — P22A1 2015 Chevrolet Silverado Code - NOx Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A1 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 P22A1 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 P22A1 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 P22A1 2015 Chevrolet Silverado code?

Need more information on how to fix the P22A1 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A1 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 P22A1 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A1 on a 2015 Chevrolet Silverado related to NOx Sensor 2 Circuit High Voltage?

- Common symptoms may include decreased fuel efficiency, rough idling, and illuminated Check Engine light.

2. What are the possible causes triggering the P22A1 code on a 2015 Chevrolet Silverado NOx Sensor 2 Circuit High Voltage issue?

- Potential causes include a faulty NOx sensor, wiring issues, poor electrical connections, or a problem in the engine control module.

3. How serious is the P22A1 fault code related to NOx Sensor 2 Circuit High Voltage on a 2015 Chevrolet Silverado?

- While the vehicle may still be operable with this fault, it is important to address the issue promptly to prevent potential damage to the emissions system.

4. What are some diagnostic steps recommended for troubleshooting the P22A1 code on a 2015 Chevrolet Silverado?

- Diagnostic steps may include checking the NOx sensor wiring, inspecting electrical connections, testing the sensor's functionality, and scanning for related codes.

5. Can I continue driving my 2015 Chevrolet Silverado with the P22A1 NOx Sensor 2 Circuit High Voltage code illuminated?

- It is generally not recommended to continue driving with the Check Engine light on, as unresolved issues may lead to further complications and potential damage.

6. How can I reset the P22A1 code on my 2015 Chevrolet Silverado related to the NOx Sensor 2 Circuit High Voltage issue?

- The code can be cleared using an OBDII scanner, but it is crucial to address the underlying problem causing the fault code before resetting it.

7. Is it possible to repair the P22A1 NOx Sensor 2 Circuit High Voltage issue on a 2015 Chevrolet Silverado without professional help?

- While some DIY enthusiasts may be able to address simple wiring or connection issues, diagnosing and repairing the root cause of the problem may require professional expertise.

8. What are some tips for preventing the recurrence of the P22A1 fault code on a 2015 Chevrolet Silverado?

- Regular vehicle maintenance, timely repairs of related issues, and using quality parts can help prevent the reoccurrence of the NOx Sensor 2 Circuit High Voltage fault.

9. How much does it typically cost to repair the P22A1 code on a 2015 Chevrolet Silverado related to NOx Sensor 2 Circuit High Voltage?

- The cost of repair can vary depending on the specific issue, parts needed, and labor rates, so it's advisable to consult with a mechanic for an accurate estimate.

10. Is the P22A1 NOx Sensor 2 Circuit High Voltage fault a common issue in 2015 Chevrolet Silverado vehicles?

- While not extremely common, issues related to NOx sensors can occur in vehicles, and addressing them promptly is essential for proper vehicle operation and emissions compliance.