AutoCodes – GMC – P0072 2017 GMC Sierra

P0072 2017 GMC Sierra Code - Ambient Air Temperature Sensor Circuit Low Voltage

Quick Answer

The Engine Control Module (ECM) monitors the ambient air temperature sensor with a low reference circuit and signal circuit. Common causes include Faulty Ambient Air Temperature Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor 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: P0072 2017 GMC Sierra indicates Ambient Air Temperature Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Ambient Air Temperature Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor 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 254

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0072 2017 GMC Sierra Description

The Engine Control Module (ECM) monitors the ambient air temperature sensor with a low reference circuit and signal circuit. The ECM monitors the voltage drop across the sensor, which is inversely proportional to temperature. When the ambient air temperature is cold, the resistance of the sensor is high. When the ambient air temperature is warm, the resistance of the sensors is low. The engine control module converts the voltage value to a temperature value and sends the value to the Display Module via serial data. The Display Module displays the temperature. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the Ambient Air Temperature Sensor signal is more than 88°C (190°F).

OBDII Code P0072 2017 GMC Sierra - Ambient Air Temperature Sensor Circuit Low Voltage - AutoCodes.com — P0072 2017 GMC Sierra Code - Ambient Air Temperature Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0072 2017 GMC Sierra?

Faulty Ambient Air Temperature Sensor
Ambient Air Temperature Sensor harness is open or shorted
Ambient Air Temperature Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0072 2017 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 P0072 2017 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 P0072 2017 GMC Sierra 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 P0072 2017 GMC Sierra Code

1. What does OBDII code P0072 mean on a 2017 GMC Sierra?

P0072 indicates that the Ambient Air Temperature Sensor Circuit is reading a low voltage, which may result in incorrect temperature readings.

2. What are the symptoms of code P0072 in a 2017 GMC Sierra?

Symptoms may include an inaccurate outside temperature display, poor HVAC system performance, or the check engine light turning on.

3. What causes the P0072 code in a 2017 GMC Sierra?

Common causes include a faulty ambient air temperature sensor, damaged wiring, corroded connectors, or a short circuit in the sensor's circuit.

4. Can I drive my 2017 GMC Sierra with a P0072 code?

Yes, you can generally drive the vehicle, but the HVAC system may not function properly, and the check engine light may stay on.

5. How do I fix the P0072 code on my 2017 GMC Sierra?

Fixes may include replacing the ambient air temperature sensor, repairing or replacing damaged wiring, or cleaning corroded connectors.

6. Where is the ambient air temperature sensor located on a 2017 GMC Sierra?

The ambient air temperature sensor is typically located near the front grille, close to the radiator or bumper.

7. How do I test the ambient air temperature sensor on a 2017 GMC Sierra?

You can test the sensor using a multimeter to check for proper resistance or voltage readings compared to manufacturer specifications.

8. What tools are needed to repair a P0072 code?

Common tools include a multimeter, basic hand tools, and possibly a scan tool to clear the code after repairs.

9. Will the P0072 code clear itself after fixing the issue?

In some cases, the code may clear itself after several drive cycles, but it's recommended to use a scan tool to clear it immediately.

10. Can extreme weather cause the P0072 code to appear?

Yes, extreme cold or heat can sometimes impact the ambient air temperature sensor, triggering the code if the sensor or wiring is already compromised.