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Engine-Codes – GMC – P22A5 2018 GMC Sierra

P22A5 2018 GMC Sierra Code - NOx Sensor 2 Heater Control Circuit High Voltage

Quick Answer

The P22A5 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the NOx (nitrogen oxide) sensor 2 heater control circuit registering high voltage. Common causes include Faulty NOx sensor 2 heater element, Wiring or connector issues in the heater control circuit, Corrosion or damage to the sensor or its components. 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 2018 GMC Sierra indicates NOx Sensor 2 Heater Control Circuit High Voltage.
Common causes
Common causes include Faulty NOx sensor 2 heater element, Wiring or connector issues in the heater control circuit, Corrosion or damage to the sensor or its components.
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 17, 2024
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Code P22A5 2018 GMC Sierra Description

The P22A5 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the NOx (nitrogen oxide) sensor 2 heater control circuit registering high voltage. This sensor plays a crucial role in monitoring and controlling the levels of nitrogen oxides in the vehicle's exhaust emissions. The heater control circuit is responsible for ensuring that the sensor operates within the optimal temperature range for accurate readings.

OBDII Code P22A5 2018 GMC Sierra - NOx Sensor 2 Heater Control Circuit High Voltage
P22A5 2018 GMC Sierra Code - NOx Sensor 2 Heater Control Circuit High Voltage

Common Causes of P22A5 2018 GMC Sierra

  1. Faulty NOx sensor 2 heater element.
  2. Wiring or connector issues in the heater control circuit.
  3. Corrosion or damage to the sensor or its components.
  4. Electrical system malfunctions.
  5. Software or calibration issues in the engine control module (ECM).

Symptoms of P22A5 2018 GMC Sierra

  1. Check engine light illuminated on the dashboard.
  2. Decreased fuel efficiency.
  3. Increased emissions output.
  4. Rough idling or engine misfires.
  5. Reduced overall performance.

How to Fix P22A5 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the NOx sensor 2, its wiring, and connectors for any visible damage or corrosion.
  2. Test the sensor's heater element and control circuit using a multimeter to determine if they are functioning within the specified parameters.
  3. Replace the NOx sensor 2 if the heater element is faulty or the control circuit is sending excessive voltage.
  4. Clear the DTC and reset the ECM to see if the code reappears after the repair.
  5. Perform a test drive to ensure that the vehicle's emissions and performance are back to normal.

Cost to Fix P22A5 2018 GMC Sierra

The typical repair costs for addressing a P22A5 code on a 2018 GMC Sierra can range from $200 to $500, including parts and labor. However, it's essential to note that specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships and lower at independent shops. To obtain a more accurate estimate, it's recommended to inquire about local rates before proceeding with the repair.

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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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P22A5 in a 2018 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

The common symptoms include illuminated check engine light, reduced engine performance, and potential failed emissions test.

2. What are the possible causes of OBDII code P22A5 in a 2018 GMC Sierra indicating a NOx Sensor 2 Heater Control Circuit High Voltage issue?

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

3. How serious is the OBDII code P22A5 in a 2018 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

While the vehicle may still operate, it is important to address this issue promptly as it can affect the vehicle's emissions output and overall performance.

4. How can I diagnose the OBDII code P22A5 in a 2018 GMC Sierra linked to NOx Sensor 2 Heater Control Circuit High Voltage?

Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, inspecting the wiring and connectors, testing the sensor's resistance, and checking the heater control circuit.

5. Can I continue driving my 2018 GMC Sierra with the OBDII code P22A5 NOx Sensor 2 Heater Control Circuit High Voltage issue?

While it may be possible to continue driving, it is recommended to address the problem promptly to prevent potential damage to other components and ensure proper emissions compliance.

6. How can I repair the OBDII code P22A5 in my 2018 GMC Sierra associated with NOx Sensor 2 Heater Control Circuit High Voltage?

Repair options may include replacing the faulty NOx sensor, repairing or replacing damaged wiring/connectors, addressing issues with the heater control circuit, or reprogramming the engine control module.

7. Are there any DIY tips for addressing the OBDII code P22A5 in a 2018 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

While basic inspections and checks can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for a proper diagnosis and repair of this complex issue.

8. How much does it typically cost to repair the OBDII code P22A5 NOx Sensor 2 Heater Control Circuit High Voltage in a 2018 GMC Sierra?

The cost of repair can vary depending on the exact cause of the issue, but it may range from a couple of hundred dollars to over a thousand dollars, including parts and labor.

9. Can resetting the OBDII system clear the P22A5 code in a 2018 GMC Sierra with a NOx Sensor 2 Heater Control Circuit High Voltage problem?

Resetting the system may clear the code temporarily, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven and the system performs its diagnostic checks.

10. How soon should I address the OBDII code P22A5 in my 2018 GMC Sierra indicating NOx Sensor 2 Heater Control Circuit High Voltage issues?

It is recommended to address the issue as soon as possible to prevent potential damage to other components, ensure proper emissions compliance, and maintain optimal vehicle performance.

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