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P0072 2018 GMC Sierra Code - Ambient Air Temperature Sensor Circuit Low Voltage

Quick Answer

The P0072 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Ambient Air Temperature (AAT) sensor circuit registering low voltage. Common causes include Faulty Ambient Air Temperature (AAT) sensor, Damaged wiring or connectors in the AAT sensor circuit, Corrosion or poor connections in the sensor circuit. 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
P0072 2018 GMC Sierra indicates Ambient Air Temperature Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty Ambient Air Temperature (AAT) sensor, Damaged wiring or connectors in the AAT sensor circuit, Corrosion or poor connections in the sensor circuit.
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 16, 2024
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Code P0072 2018 GMC Sierra Description

The P0072 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Ambient Air Temperature (AAT) sensor circuit registering low voltage. The AAT sensor is responsible for measuring the temperature of the air surrounding the vehicle, providing crucial data for the engine control module (ECM) to adjust fuel delivery and ignition timing. When the AAT sensor circuit detects low voltage, it can lead to incorrect temperature readings being sent to the ECM, which can result in poor engine performance, reduced fuel efficiency, and potential drivability issues.

OBDII Code P0072 2018 GMC Sierra - Ambient Air Temperature Sensor Circuit Low Voltage
P0072 2018 GMC Sierra Code - Ambient Air Temperature Sensor Circuit Low Voltage

Common Causes of P0072 2018 GMC Sierra

  1. Faulty Ambient Air Temperature (AAT) sensor.
  2. Damaged wiring or connectors in the AAT sensor circuit.
  3. Corrosion or poor connections in the sensor circuit.
  4. Malfunctioning Engine Control Module (ECM).
  5. Environmental factors such as extreme temperatures affecting sensor performance.

Symptoms of P0072 2018 GMC Sierra

  1. Check engine light illuminated on the dashboard.
  2. Rough idling or stalling.
  3. Reduced fuel efficiency.
  4. Hesitation or lack of power during acceleration.
  5. Incorrect temperature readings displayed on the vehicle's climate control system.

How to Fix P0072 2018 GMC Sierra

  1. Begin by locating the AAT sensor, typically located near the front grille or bumper of the vehicle.
  2. Inspect the sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the AAT sensor using a multimeter to check for proper voltage output.
  4. If the sensor is faulty, replace it with a new OEM or aftermarket sensor.
  5. Clear the DTC with a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0072 2018 GMC Sierra

The cost of repairing a P0072 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. Typically, the cost of a new AAT sensor can range from $20 to $50, while labor costs for diagnosis and repair can range from $100 to $300. Overall, the total repair cost for this issue could be between $120 and $350. It's important to note that labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple shops to ensure a competitive price.

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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 P0072 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P0072 in a 2018 GMC Sierra?

The common symptoms of OBDII code P0072 in a 2018 GMC Sierra include incorrect temperature readings on the dashboard, issues with the vehicle's climate control system, and potential engine performance problems.

2. What does the Ambient Air Temperature Sensor do in a 2018 GMC Sierra?

The Ambient Air Temperature Sensor in a 2018 GMC Sierra measures the outside air temperature and sends this information to the engine control module (ECM) to help regulate various systems like the climate control and engine performance.

3. What causes the Ambient Air Temperature Sensor Circuit Low Voltage error code (P0072) in a 2018 GMC Sierra?

The Ambient Air Temperature Sensor Circuit Low Voltage error code (P0072) in a 2018 GMC Sierra is typically caused by a faulty ambient air temperature sensor, damaged wiring or connectors, or issues with the sensor's electrical circuit.

4. How can I diagnose the Ambient Air Temperature Sensor Circuit Low Voltage issue (P0072) in my 2018 GMC Sierra?

To diagnose the Ambient Air Temperature Sensor Circuit Low Voltage issue (P0072) in a 2018 GMC Sierra, you can use a scan tool to read the OBDII codes, visually inspect the sensor and its connections for any damage, and perform a voltage test on the sensor.

5. Can I drive my 2018 GMC Sierra with the P0072 error code?

It is generally safe to drive your 2018 GMC Sierra with the P0072 error code, but it is recommended to address the issue promptly to prevent potential problems with the vehicle's climate control system and engine performance.

6. How do I repair the Ambient Air Temperature Sensor Circuit Low Voltage error code (P0072) in my 2018 GMC Sierra?

To repair the Ambient Air Temperature Sensor Circuit Low Voltage error code (P0072) in a 2018 GMC Sierra, you may need to replace the ambient air temperature sensor, repair any damaged wiring or connectors, or reset the ECM after fixing the issue.

7. Are there any DIY tips for fixing the P0072 error code in a 2018 GMC Sierra?

If you are familiar with automotive repairs, you can attempt to replace the ambient air temperature sensor yourself by following the vehicle's service manual or online guides. However, if you are unsure, it is advisable to seek professional help.

8. How much does it cost to fix the Ambient Air Temperature Sensor Circuit Low Voltage error code (P0072) in a 2018 GMC Sierra?

The cost of fixing the Ambient Air Temperature Sensor Circuit Low Voltage error code (P0072) in a 2018 GMC Sierra can vary depending on the cause of the issue, the labor rates of the service provider, and the cost of replacement parts. It is recommended to obtain quotes from different repair shops.

9. Can a faulty Ambient Air Temperature Sensor affect fuel efficiency in a 2018 GMC Sierra?

Yes, a faulty Ambient Air Temperature Sensor can potentially affect fuel efficiency in a 2018 GMC Sierra by causing incorrect air-fuel mixture adjustments based on inaccurate temperature readings, leading to suboptimal engine performance.

10. How often should the Ambient Air Temperature Sensor be replaced in a 2018 GMC Sierra?

The Ambient Air Temperature Sensor in a 2018 GMC Sierra does not have a specific replacement interval. It is recommended to replace the sensor when it fails or shows signs of malfunction to ensure accurate temperature readings and proper operation of the vehicle's systems.

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