AutoCodes – GMC – P22A0 2015 GMC Sierra

P22A0 2015 GMC Sierra Code - NOx Sensor 2 Circuit Low 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: P22A0 2015 GMC Sierra indicates NOx Sensor 2 Circuit Low 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 196

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 P22A0 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 P22A0 2015 GMC Sierra - NOx Sensor 2 Circuit Low Voltage - AutoCodes.com — P22A0 2015 GMC Sierra Code - NOx Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P22A0 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 P22A0 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 P22A0 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 P22A0 2015 GMC Sierra code?

Need more information on how to fix the P22A0 2015 GMC Sierra code? Get Access to Factory Service Manuals

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 P22A0 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P22A0 in a 2015 GMC Sierra related to NOx Sensor 2 Circuit Low Voltage?

- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P22A0 in a 2015 GMC Sierra indicating NOx Sensor 2 Circuit Low Voltage?

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

3. How can I diagnose the source of OBDII code P22A0 in my 2015 GMC Sierra linked to NOx Sensor 2 Circuit Low Voltage?

- A thorough diagnostic process involves checking the sensor connections, inspecting the wiring for damage, testing the sensor heater circuit, and using a scan tool to analyze live data for sensor readings.

4. Can I continue driving my 2015 GMC Sierra with OBDII code P22A0 related to NOx Sensor 2 Circuit Low Voltage?

- It is not recommended to continue driving the vehicle with this fault code present, as it can lead to further engine damage and increased emissions.

5. How do I repair OBDII code P22A0 in my 2015 GMC Sierra indicating NOx Sensor 2 Circuit Low Voltage?

- Repair typically involves replacing the faulty NOx sensor, repairing any damaged wiring or connectors, and clearing the code with a diagnostic scan tool.

6. Are there any DIY tips for addressing OBDII code P22A0 in a 2015 GMC Sierra due to NOx Sensor 2 Circuit Low Voltage?

- DIY tips include checking the sensor connections for tightness, inspecting the wiring visually for any obvious damage, and ensuring the sensor heater circuit is functioning correctly.

7. What is the function of NOx Sensor 2 in a 2015 GMC Sierra and how does it impact vehicle performance?

- NOx Sensor 2 monitors the level of nitrogen oxide in the exhaust gases to help the engine control module optimize fuel-air mixture for better performance and reduced emissions.

8. How critical is it to address OBDII code P22A0 in a 2015 GMC Sierra related to NOx Sensor 2 Circuit Low Voltage promptly?

- It is crucial to address this code promptly to prevent potential damage to the engine and ensure optimal fuel efficiency and emissions control.

9. Can extreme weather conditions impact the occurrence of OBDII code P22A0 in a 2015 GMC Sierra due to NOx Sensor 2 Circuit Low Voltage?

- Yes, extreme temperatures or environmental conditions can sometimes affect the sensor's performance and trigger the low voltage fault code.

10. Is it necessary to reset the engine control module after repairing OBDII code P22A0 in a 2015 GMC Sierra caused by NOx Sensor 2 Circuit Low Voltage?

- Yes, resetting the engine control module with a diagnostic scan tool after the repair is essential to clear the fault code and ensure proper sensor operation.