AutoCodes – Chevrolet – P22A5 2018 Chevrolet Silverado

P22A5 2018 Chevrolet Silverado Code - NOx Sensor 2 Heater Control 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: P22A5 2018 Chevrolet Silverado indicates NOx Sensor 2 Heater Control 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 237

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 P22A5 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 P22A5 2018 Chevrolet Silverado - NOx Sensor 2 Heater Control Circuit High Voltage - AutoCodes.com — P22A5 2018 Chevrolet Silverado Code - NOx Sensor 2 Heater Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A5 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 P22A5 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 P22A5 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 P22A5 2018 Chevrolet Silverado code?

Need more information on how to fix the P22A5 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A5 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 P22A5 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A5 in a 2018 Chevrolet Silverado?

The common symptoms of OBDII code P22A5 (NOx Sensor 2 Heater Control Circuit High Voltage) in a 2018 Chevrolet Silverado may include the Check Engine Light illuminating, reduced engine performance, and potentially increased emissions.

2. What can cause the OBDII code P22A5 to trigger in a 2018 Chevrolet Silverado?

The OBDII code P22A5 in a 2018 Chevrolet Silverado is typically triggered by a malfunction in the NOx Sensor 2 heater control circuit, leading to high voltage readings. This can be caused by issues such as a faulty sensor, damaged wiring, or a problem with the vehicle's engine control module.

3. How serious is the OBDII code P22A5 in a 2018 Chevrolet Silverado?

While the OBDII code P22A5 (NOx Sensor 2 Heater Control Circuit High Voltage) in a 2018 Chevrolet Silverado may not cause immediate drivability issues, it can lead to increased emissions and potentially impact the vehicle's overall performance. It is recommended to address this code promptly to prevent further complications.

4. Can I still drive my 2018 Chevrolet Silverado with the OBDII code P22A5 present?

If the OBDII code P22A5 (NOx Sensor 2 Heater Control Circuit High Voltage) triggers in your 2018 Chevrolet Silverado, you can still drive the vehicle in most cases. However, it is advisable to have the issue diagnosed and repaired as soon as possible to prevent any long-term damage or performance issues.

5. How can I diagnose and repair the OBDII code P22A5 in my 2018 Chevrolet Silverado?

Diagnosing and repairing the OBDII code P22A5 in a 2018 Chevrolet Silverado typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the NOx Sensor 2 heater circuit for any issues, checking the wiring for damage, and testing the sensor's functionality. Repairs may include replacing the sensor, repairing wiring, or addressing any underlying issues with the vehicle's control module.

6. Is it safe to reset the Check Engine Light after addressing the OBDII code P22A5 in a 2018 Chevrolet Silverado?

Once you have diagnosed and repaired the issue causing the OBDII code P22A5 in your 2018 Chevrolet Silverado, it is safe to reset the Check Engine Light using a diagnostic scanner. This will clear the code and allow you to monitor if the issue reoccurs.

7. Can a DIY enthusiast fix the OBDII code P22A5 issue in a 2018 Chevrolet Silverado?

While some DIY enthusiasts may have the skills to diagnose and repair the OBDII code P22A5 (NOx Sensor 2 Heater Control Circuit High Voltage) in a 2018 Chevrolet Silverado, this repair can be complex. It involves dealing with sensitive emissions components and electrical systems, so it is recommended to consult a professional mechanic for accurate diagnosis and repair.

8. How much does it typically cost to repair the OBDII code P22A5 in a 2018 Chevrolet Silverado?

The cost of repairing the OBDII code P22A5 (NOx Sensor 2 Heater Control Circuit High Voltage) in a 2018 Chevrolet Silverado can vary depending on the underlying issue causing the code. Costs may include diagnostic fees, replacement sensor costs, labor charges, and any additional parts or repairs needed. It is best to get a specific quote from a trusted mechanic.

9. Can the OBDII code P22A5 in a 2018 Chevrolet Silverado cause other problems if left unaddressed?

If left unaddressed, the OBDII code P22A5 (NOx Sensor 2 Heater Control Circuit High Voltage) in a 2018 Chevrolet Silverado can potentially lead to increased emissions, reduced fuel efficiency, and impact the overall performance of the vehicle. It is advisable to address this code promptly to prevent any further complications.

10. Is the OBDII code P22A5 covered under any warranty for a 2018 Chevrolet Silverado?

Depending on the specific warranty coverage of your 2018 Chevrolet Silverado, the repair for the OBDII code P22A5 (NOx Sensor 2 Heater Control Circuit High Voltage) may be covered. It is recommended to check your vehicle's warranty information or consult with a dealership to determine if the repair is eligible for coverage.