AutoCodes – Chevrolet – P22A5 2016 Chevrolet Silverado

P22A5 2016 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 2016 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 333

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 2016 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 2016 Chevrolet Silverado - NOx Sensor 2 Heater Control Circuit High Voltage - AutoCodes.com — P22A5 2016 Chevrolet Silverado Code - NOx Sensor 2 Heater Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A5 2016 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 2016 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 2016 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 2016 Chevrolet Silverado code?

Need more information on how to fix the P22A5 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A5 2016 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 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A5 in a 2016 Chevrolet Silverado?

- Common symptoms include the check engine light illuminating, reduced engine performance, poor fuel efficiency, and potential exhaust emissions issues.

2. What does the P22A5 code "NOx Sensor 2 Heater Control Circuit High Voltage" mean for a 2016 Silverado?

- This code indicates that there is high voltage detected in the heater control circuit of the NOx sensor 2 in the exhaust system of the vehicle.

3. What are the possible causes of the NOx Sensor 2 Heater Control Circuit High Voltage code in a 2016 Chevrolet Silverado?

- Potential causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, a malfunctioning heater control circuit, or issues with the engine control module (ECM).

4. How serious is the P22A5 fault code in a 2016 Silverado, and is it safe to continue driving the vehicle?

- While the vehicle may still be operable with this code present, it is recommended to address the issue promptly to prevent potential damage to the emissions system and ensure optimal engine performance.

5. Can I repair the NOx Sensor 2 Heater Control Circuit High Voltage issue in my 2016 Chevrolet Silverado myself?

- Repairing this issue may require specialized diagnostic equipment and expertise, so it is advisable to have a qualified mechanic or dealership service center address the problem.

6. How much does it typically cost to repair the P22A5 code in a 2016 Silverado?

- Repair costs can vary depending on the specific cause of the issue, but it may involve replacing the NOx sensor, repairing wiring or connectors, or reprogramming the ECM. Costs can range from a few hundred to over a thousand dollars.

7. Will resetting the check engine light clear the P22A5 fault code in a 2016 Chevrolet Silverado?

- While resetting the check engine light may temporarily turn it off, the underlying issue causing the fault code will still need to be diagnosed and repaired to prevent the code from reoccurring.

8. How can I prevent the NOx Sensor 2 Heater Control Circuit High Voltage code from coming back in my 2016 Silverado?

- Regular maintenance, such as checking and replacing faulty sensors, ensuring proper wiring connections, and following recommended service intervals, can help prevent this code from reappearing.

9. Is the NOx Sensor 2 Heater Control Circuit High Voltage fault common in 2016 Chevrolet Silverado vehicles?

- While not extremely common, issues with NOx sensors and related circuits can occur in vehicles with complex emissions systems like the 2016 Silverado, especially as they age and accumulate mileage.

10. Can a faulty NOx sensor cause other problems in a 2016 Silverado besides triggering the P22A5 fault code?

- Yes, a faulty NOx sensor can potentially affect the vehicle's emissions output, engine performance, and fuel efficiency, so addressing the issue promptly is important for overall vehicle health.