AutoCodes – GMC – P0072 GMC

P0072 GMC 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 GMC 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 578

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

What does this mean?

What are the Possible Causes of the DTC P0072 GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the P0072 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0072 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0072 2014 GMC Sierra — Ambient Air Temperature Sensor Circuit Low Voltage
P0072 2015 GMC Sierra — Ambient Air Temperature Sensor Circuit Low Voltage
P0072 2016 GMC Sierra — Ambient Air Temperature Sensor Circuit Low Voltage
P0072 2017 GMC Sierra — Ambient Air Temperature Sensor Circuit Low Voltage
P0072 2018 GMC Sierra — Ambient Air Temperature Sensor Circuit Low Voltage

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 GMC Code

1. What are the common symptoms of OBDII code P0072 GMC?

- Common symptoms include inaccurate temperature readings on the vehicle's display, issues with the climate control system, and potential fuel efficiency problems.

2. What causes the OBDII code P0072 GMC to trigger?

- The code is typically triggered when the ambient air temperature sensor circuit detects a lower voltage signal than expected, indicating a malfunction in the sensor or its wiring.

3. How can I diagnose the issue related to code P0072 GMC?

- To diagnose the problem, you can use a multimeter to test the voltage output of the ambient air temperature sensor and check for any damaged wiring or connections.

4. What are some possible repair tips for resolving code P0072 GMC?

- Common repair tips include replacing the faulty ambient air temperature sensor, repairing any damaged wiring, and ensuring proper connections are in place.

5. Can a malfunctioning ambient air temperature sensor affect the vehicle's performance?

- Yes, a malfunctioning ambient air temperature sensor can impact the vehicle's performance by causing incorrect temperature readings, leading to potential issues with the engine's fuel mixture and overall efficiency.

6. Is it safe to continue driving with OBDII code P0072 GMC present?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to prevent any further complications and ensure optimal performance.

7. Can extreme weather conditions affect the ambient air temperature sensor's functionality?

- Yes, extreme temperatures such as extreme heat or cold can potentially affect the ambient air temperature sensor's performance, leading to erroneous readings and triggering code P0072 GMC.

8. How long does it typically take to repair the ambient air temperature sensor circuit issue?

- The repair time can vary depending on the extent of the problem, but replacing the ambient air temperature sensor or repairing wiring issues can usually be completed within a few hours.

9. Are there any preventive measures to avoid encountering code P0072 GMC in the future?

- Regularly inspecting the ambient air temperature sensor and its wiring for any signs of damage, and addressing any issues promptly can help prevent the recurrence of code P0072 GMC.

10. Can a DIY enthusiast with basic automotive knowledge fix code P0072 GMC?

- Yes, individuals with basic automotive knowledge can attempt to diagnose and repair code P0072 GMC by following repair guides and using the necessary tools like a multimeter. However, if unsure, it's recommended to seek professional assistance.