AutoCodes – GMC – P22A5 2015 GMC Sierra

P22A5 2015 GMC Sierra 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 2015 GMC Sierra 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 154

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 2015 GMC Sierra 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 2015 GMC Sierra - NOx Sensor 2 Heater Control Circuit High Voltage - AutoCodes.com — P22A5 2015 GMC Sierra Code - NOx Sensor 2 Heater Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A5 2015 GMC Sierra?

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 2015 GMC Sierra?

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 2015 GMC Sierra 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 2015 GMC Sierra code?

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Need Help with the Code?

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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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P22A5 in a 2015 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

The common symptoms include the Check Engine Light illuminating, reduced engine performance, failed emissions test, and potential fuel efficiency issues.

2. What could cause the NOx Sensor 2 Heater Control Circuit High Voltage fault code P22A5 in a 2015 GMC Sierra?

Possible causes of this code may include a faulty NOx sensor, damaged wiring or connectors, a malfunctioning heater circuit, or issues with the vehicle's engine control module.

3. How can I diagnose the NOx Sensor 2 Heater Control Circuit High Voltage issue in my 2015 GMC Sierra?

Diagnosing this problem typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the sensor and its connections for any visible damage, and testing the heater circuit for proper function.

4. Can I continue driving my 2015 GMC Sierra with the P22A5 NOx Sensor 2 Heater Control Circuit High Voltage code?

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

5. How do I repair the NOx Sensor 2 Heater Control Circuit High Voltage problem in my 2015 GMC Sierra?

Repairing this issue often involves replacing the faulty NOx sensor, repairing any damaged wiring or connectors, checking and repairing the heater circuit if necessary, and clearing the fault code with an OBDII scanner.

6. Are there any DIY tips for troubleshooting the NOx Sensor 2 Heater Control Circuit High Voltage fault code P22A5 in a 2015 GMC Sierra?

DIY enthusiasts can start by visually inspecting the sensor and its connections, checking for any visible signs of damage, and testing the heater circuit with a multimeter to determine if it is functioning correctly.

7. What are the potential consequences of ignoring the P22A5 NOx Sensor 2 Heater Control Circuit High Voltage code in a 2015 GMC Sierra?

Ignoring this fault code can lead to increased emissions, reduced fuel efficiency, potential damage to the catalytic converter, and possible failure to pass emissions tests in some areas.

8. Is it necessary to reset the OBDII system after repairing the NOx Sensor 2 Heater Control Circuit High Voltage issue in a 2015 GMC Sierra?

Yes, it is important to reset the OBDII system after making repairs to clear the fault code and ensure that the Check Engine Light does not reappear unnecessarily.

9. Can extreme weather conditions impact the occurrence of the P22A5 NOx Sensor 2 Heater Control Circuit High Voltage code in a 2015 GMC Sierra?

Extreme cold or hot weather conditions can potentially affect the performance of the NOx sensor and its heater circuit, leading to the triggering of this fault code in some cases.

10. How can regular maintenance help prevent the NOx Sensor 2 Heater Control Circuit High Voltage fault code in a 2015 GMC Sierra?

Regular maintenance, including periodic inspection of the emissions control system, checking for any signs of wear or damage, and addressing any issues promptly, can help prevent the occurrence of this fault code and ensure proper vehicle operation.