AutoCodes – GMC – P22A1 2015 GMC Sierra

P22A1 2015 GMC Sierra Code - NOx Sensor 2 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: P22A1 2015 GMC Sierra indicates NOx Sensor 2 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 150

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P22A1 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 P22A1 2015 GMC Sierra - NOx Sensor 2 Circuit High Voltage - AutoCodes.com — P22A1 2015 GMC Sierra Code - NOx Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A1 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 P22A1 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 P22A1 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 P22A1 2015 GMC Sierra code?

Need more information on how to fix the P22A1 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A1 2015 GMC Sierra 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 P22A1 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P22A1 in a 2015 GMC Sierra related to NOx Sensor 2 Circuit High Voltage?

The common symptoms include the illumination of the check engine light, reduced engine performance, and potential increased fuel consumption.

2. What are the possible causes of OBDII code P22A1 in a 2015 GMC Sierra indicating NOx Sensor 2 Circuit High Voltage?

Potential causes may include a faulty NOx sensor, issues with the wiring or connectors in the NOx sensor circuit, or problems with the engine control module.

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

You can start by checking the wiring and connectors related to the NOx sensor, performing a visual inspection for any damage, and using a multimeter to test for continuity and proper voltage.

4. Can a dirty or failing NOx sensor cause OBDII code P22A1 in a 2015 GMC Sierra?

Yes, a dirty or failing NOx sensor can lead to high voltage readings and trigger the P22A1 code, indicating an issue with NOx Sensor 2 Circuit High Voltage.

5. Is it safe to continue driving my 2015 GMC Sierra with the NOx Sensor 2 Circuit High Voltage fault code?

It is generally not recommended to continue driving with the P22A1 code illuminated, as it can lead to reduced engine performance and potentially affect emissions levels.

6. How much does it typically cost to repair OBDII code P22A1 related to NOx Sensor 2 Circuit High Voltage in a 2015 GMC Sierra?

The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the NOx sensor, repairing wiring or connectors, or addressing issues with the engine control module. Costs can range from a few hundred to over a thousand dollars.

7. Can resetting the OBDII code P22A1 in a 2015 GMC Sierra fix the NOx Sensor 2 Circuit High Voltage problem?

Resetting the code may temporarily turn off the check engine light, but it will not address the underlying issue causing the high voltage readings in the NOx sensor circuit.

8. How often should the NOx sensor be replaced in a 2015 GMC Sierra to prevent OBDII code P22A1 from occurring?

The NOx sensor typically does not have a specified replacement interval and should be replaced when it fails or shows signs of malfunction, such as triggering the P22A1 fault code.

9. Are there any DIY repair tips for addressing OBDII code P22A1 related to NOx Sensor 2 Circuit High Voltage in a 2015 GMC Sierra?

DIY enthusiasts can attempt to inspect and clean the NOx sensor, check for loose or damaged wiring, and reset the code to see if the issue resolves before considering professional assistance.

10. Can a mechanic easily diagnose and repair the NOx Sensor 2 Circuit High Voltage problem indicated by OBDII code P22A1 in a 2015 GMC Sierra?

Yes, a qualified mechanic with the proper diagnostic tools can efficiently diagnose the issue, pinpoint the cause of the high voltage readings, and recommend the necessary repairs to resolve the P22A1 fault code.