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Engine-Codes – GMC – P22A1 2018 GMC Sierra

P22A1 2018 GMC Sierra Code - NOx Sensor 2 Circuit High Voltage

Quick Answer

The P22A1 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the NOx (nitrogen oxide) sensor 2 circuit registering high voltage. Common causes include Faulty NOx sensor 2, Damaged wiring or connectors in the sensor circuit, Issues with the engine control module (ECM). 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 2018 GMC Sierra indicates NOx Sensor 2 Circuit High Voltage.
Common causes
Common causes include Faulty NOx sensor 2, Damaged wiring or connectors in the sensor circuit, Issues with the engine control module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P22A1 2018 GMC Sierra Description

The P22A1 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the NOx (nitrogen oxide) sensor 2 circuit registering high voltage. This sensor is crucial for monitoring the levels of nitrogen oxide in the exhaust gases and ensuring compliance with emissions regulations. When the NOx sensor 2 circuit reports high voltage, it means that the sensor is detecting an excessive amount of nitrogen oxide in the exhaust, which could lead to increased emissions and potential harm to the environment.

OBDII Code P22A1 2018 GMC Sierra - NOx Sensor 2 Circuit High Voltage
P22A1 2018 GMC Sierra Code - NOx Sensor 2 Circuit High Voltage

Common Causes of P22A1 2018 GMC Sierra

  1. Faulty NOx sensor 2
  2. Damaged wiring or connectors in the sensor circuit
  3. Issues with the engine control module (ECM)
  4. Exhaust leaks

Symptoms of P22A1 2018 GMC Sierra

  1. Decreased fuel efficiency
  2. Reduced engine power
  3. Check Engine Light illuminated
  4. Failed emissions test

How to Fix P22A1 2018 GMC Sierra

  1. Use an OBD-II scanner to read and record the code. Clear the code and see if it returns.
  2. Inspect the NOx sensor 2 and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
  3. Check the ECM for any faults or programming issues. Update or replace the ECM if needed.
  4. Perform a smoke test to check for exhaust leaks and repair any leaks found.
  5. Clear the code, reset the vehicle's computer, and test drive to ensure the issue is resolved.

Cost to Fix P22A1 2018 GMC Sierra

The cost of repairing a NOx sensor 2 circuit high voltage issue can vary depending on the specific cause of the problem. In general, replacing a faulty NOx sensor can cost between $200 and $500, including parts and labor. If the issue is related to wiring or the ECM, the repair costs could be higher. Additionally, diagnostic time and labor rates at auto repair shops can vary, typically ranging from $80 to $150 per hour. It is advisable to check with local repair shops for a more accurate estimate based on the specific circumstances of your vehicle.

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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 P22A1 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P22A1 in a 2018 GMC Sierra related to NOx Sensor 2 Circuit High Voltage?

The common symptoms include the check engine light coming on, decreased fuel efficiency, and potential engine performance issues.

2. What are the possible causes of OBDII code P22A1 indicating NOx Sensor 2 Circuit High Voltage in a 2018 GMC Sierra?

Possible causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, issues with the engine control module (ECM), or exhaust system problems.

3. How can I diagnose the OBDII code P22A1 in my 2018 GMC Sierra for NOx Sensor 2 Circuit High Voltage?

Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the NOx sensor and its connections, checking for damaged wiring, and testing the sensor's voltage output.

4. Can I continue driving my 2018 GMC Sierra with OBDII code P22A1 related to NOx Sensor 2 Circuit High Voltage?

It is not recommended to continue driving with this code active, as it can lead to increased emissions, potential damage to the catalytic converter, and poor engine performance.

5. How can I repair OBDII code P22A1 for NOx Sensor 2 Circuit High Voltage in my 2018 GMC Sierra?

Repair options may include replacing the NOx sensor, repairing damaged wiring or connectors, resetting the engine control module, or addressing any underlying exhaust system issues.

6. Is it possible to reset the OBDII code P22A1 in a 2018 GMC Sierra without fixing the underlying issue with the NOx Sensor 2 Circuit High Voltage?

While you can clear the code temporarily, it is essential to address the root cause of the issue to prevent further problems and ensure proper vehicle operation.

7. Are there any maintenance tips to prevent OBDII code P22A1 related to NOx Sensor 2 Circuit High Voltage in a 2018 GMC Sierra?

Regularly inspecting and maintaining the exhaust system, including the NOx sensor and its connections, can help prevent issues that trigger this code.

8. Can extreme weather conditions affect the NOx Sensor 2 Circuit High Voltage in a 2018 GMC Sierra and trigger OBDII code P22A1?

Extreme temperatures or environmental conditions can potentially impact the sensor's performance and trigger the code, so it's essential to consider these factors during diagnosis and repairs.

9. Are there any recalls or technical service bulletins related to OBDII code P22A1 NOx Sensor 2 Circuit High Voltage in a 2018 GMC Sierra?

It is advisable to check with GMC dealerships or online databases for any recalls or technical service bulletins related to this specific OBDII code in your vehicle.

10. Can a DIY enthusiast with automotive knowledge repair OBDII code P22A1 for NOx Sensor 2 Circuit High Voltage in a 2018 GMC Sierra?

While some basic repairs like checking connections or replacing simple components may be possible for a DIY enthusiast, diagnosing and repairing complex issues may require professional assistance or specialized tools.

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