AutoCodes – Chevrolet – P22A5 Chevrolet

P22A5 Chevrolet 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 Chevrolet 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 447

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

What does this mean?

What are the Possible Causes of the DTC P22A5 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P22A5 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P22A5 2014 Chevrolet Silverado — NOx Sensor 2 Heater Control Circuit High Voltage
P22A5 2015 Chevrolet Silverado — NOx Sensor 2 Heater Control Circuit High Voltage
P22A5 2016 Chevrolet Silverado — NOx Sensor 2 Heater Control Circuit High Voltage
P22A5 2017 Chevrolet Silverado — NOx Sensor 2 Heater Control Circuit High Voltage
P22A5 2018 Chevrolet Silverado — NOx Sensor 2 Heater Control Circuit High Voltage

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 Chevrolet Code

1. What are the common symptoms of OBDII code P22A5 in a Chevrolet related to NOx Sensor 2 Heater Control Circuit High Voltage?

- Common symptoms include illuminated Check Engine Light, reduced engine performance, and potential failed emissions test.

2. What could be the possible causes of OBDII code P22A5 in a Chevrolet indicating an issue with NOx Sensor 2 Heater Control Circuit High Voltage?

- Possible causes may include a faulty NOx sensor, damaged wiring or connectors, a malfunctioning heater control circuit, or issues with the engine control module.

3. How can I diagnose the OBDII code P22A5 in a Chevrolet associated with NOx Sensor 2 Heater Control Circuit High Voltage?

- Diagnosing this code typically involves using a scan tool to retrieve the fault codes, performing visual inspections of the sensor and related components, and testing the electrical connections for proper voltage and continuity.

4. What are the recommended repair tips for resolving OBDII code P22A5 in a Chevrolet related to NOx Sensor 2 Heater Control Circuit High Voltage?

- Repair tips may include replacing the faulty NOx sensor, repairing damaged wiring or connectors, checking and repairing the heater control circuit, and resetting the fault codes after making necessary repairs.

5. Can driving with OBDII code P22A5 in a Chevrolet related to NOx Sensor 2 Heater Control Circuit High Voltage cause further damage to the vehicle?

- Continuing to drive with this code may lead to increased emissions, reduced fuel efficiency, and potential damage to other emission control components over time.

6. How much does it typically cost to repair OBDII code P22A5 in a Chevrolet related to NOx Sensor 2 Heater Control Circuit High Voltage?

- Repair costs can vary depending on the exact cause of the issue, but it may range from $200 to $500 for parts and labor at a dealership or auto repair shop.

7. Is it safe to continue driving my Chevrolet with OBDII code P22A5 indicating an issue with NOx Sensor 2 Heater Control Circuit High Voltage?

- It is generally not recommended to continue driving with this code illuminated, as it can lead to poor engine performance and potential emissions issues. It is best to have the issue diagnosed and repaired as soon as possible.

8. Can a DIY enthusiast repair OBDII code P22A5 in a Chevrolet related to NOx Sensor 2 Heater Control Circuit High Voltage?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address this issue by following repair guides and tutorials. However, it is recommended to consult a professional if unsure.

9. How long does it take to repair OBDII code P22A5 associated with NOx Sensor 2 Heater Control Circuit High Voltage in a Chevrolet?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair. It may take anywhere from 1 to 3 hours for a skilled technician to diagnose and fix the problem.

10. Are there any preventative measures to avoid encountering OBDII code P22A5 in a Chevrolet related to NOx Sensor 2 Heater Control Circuit High Voltage in the future?

- Regular maintenance, such as checking the emission control system during scheduled services, can help prevent issues that may trigger this fault code. Additionally, avoiding harsh driving conditions can help prolong the lifespan of emission components.