AutoCodes – Buick – P0072 Buick

P0072 Buick 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 Buick 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 555

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

What does this mean?

What are the Possible Causes of the DTC P0072 Buick?

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 Buick?

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 Buick 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.

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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 Buick Code

1. What are the common symptoms of OBDII code P0072 in a Buick related to the Ambient Air Temperature Sensor Circuit Low Voltage?

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

2. What are the possible causes of OBDII code P0072 in a Buick indicating an Ambient Air Temperature Sensor Circuit Low Voltage?

- Potential causes may include a faulty ambient air temperature sensor, damaged wiring or connectors in the sensor circuit, or issues with the sensor's power supply.

3. How can I diagnose the Ambient Air Temperature Sensor Circuit Low Voltage issue triggering OBDII code P0072 in my Buick?

- You can diagnose the problem by visually inspecting the sensor and its wiring for damage, testing the sensor's resistance with a multimeter, and checking for proper voltage supply to the sensor.

4. What are some repair tips for addressing OBDII code P0072 related to the Ambient Air Temperature Sensor Circuit Low Voltage in a Buick?

- Repair tips may involve replacing the ambient air temperature sensor, repairing or replacing damaged wiring or connectors, and ensuring the sensor receives the correct voltage.

5. Can I drive my Buick with OBDII code P0072 indicating an Ambient Air Temperature Sensor Circuit Low Voltage?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent potential fuel efficiency problems and climate control issues.

6. How much does it typically cost to repair OBDII code P0072 due to an Ambient Air Temperature Sensor Circuit Low Voltage in a Buick?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Are there any temporary fixes or workarounds for OBDII code P0072 in a Buick related to the Ambient Air Temperature Sensor Circuit Low Voltage?

- While temporary fixes are not recommended, you may try resetting the fault code to see if it reappears, but it is crucial to address the root cause of the problem for a permanent solution.

8. Can extreme weather conditions affect the Ambient Air Temperature Sensor Circuit and trigger OBDII code P0072 in a Buick?

- Yes, extreme temperatures can potentially impact the sensor's performance, leading to incorrect voltage readings and the triggering of code P0072.

9. Is it possible for a DIY enthusiast to replace the Ambient Air Temperature Sensor in a Buick to resolve OBDII code P0072?

- Yes, replacing the ambient air temperature sensor is a relatively straightforward task that DIY enthusiasts with basic automotive repair skills can typically handle.

10. How often should the Ambient Air Temperature Sensor be replaced in a Buick to prevent recurring issues with OBDII code P0072?

- The ambient air temperature sensor does not have a specific replacement interval, but it is recommended to replace it if issues related to code P0072 persist after other repairs have been made.