AutoCodes – Buick – P0071 Buick

P0071 Buick Code - Ambient Air Temperature Sensor Performance

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: P0071 Buick indicates Ambient Air Temperature Sensor Performance.
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 640

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 P0071 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 if the ECM detects that during the first 20s of run time after the 1 hour soaking period, the difference between the outside air temperature and the engine intake air temperature is greater than 30°C (86°F).

OBDII Code P0071 Buick - Ambient Air Temperature Sensor Performance - AutoCodes.com — P0071 Buick Code - Ambient Air Temperature Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P0071 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 P0071 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 P0071 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 P0071 Buick Code

1. What are the common symptoms of OBDII code P0071 in a Buick related to the Ambient Air Temperature Sensor?

The common symptoms include incorrect temperature readings on the dashboard, poor fuel efficiency, and potential issues with the vehicle's air conditioning system.

2. What are the possible causes of the OBDII code P0071 in a Buick?

The P0071 code in a Buick is typically triggered by a faulty ambient air temperature sensor, wiring issues, or a poor electrical connection to the sensor.

3. How can I diagnose the Ambient Air Temperature Sensor performance issue causing the OBDII code P0071 in my Buick?

To diagnose the problem, you can visually inspect the sensor and its wiring for any damage, test the sensor's resistance with a multimeter, and check for any loose connections or corrosion.

4. Can I drive my Buick with the OBDII code P0071 related to the Ambient Air Temperature Sensor issue?

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 other issues.

5. How can I repair the Ambient Air Temperature Sensor performance issue causing the OBDII code P0071 in my Buick?

The repair typically involves replacing the ambient air temperature sensor with a new one, ensuring proper wiring connections, and clearing the fault code from the vehicle's computer.

6. Will resetting the OBDII code P0071 in my Buick temporarily fix the Ambient Air Temperature Sensor issue?

Resetting the code may temporarily clear the warning light, but if the underlying issue with the ambient air temperature sensor is not fixed, the code is likely to reappear.

7. Can extreme weather conditions affect the performance of the Ambient Air Temperature Sensor in a Buick, leading to the OBDII code P0071?

Yes, extreme temperatures can impact the sensor's performance, so it's important to consider weather conditions when diagnosing issues related to the ambient air temperature sensor.

8. Is it possible for a dirty or obstructed ambient air temperature sensor to trigger the OBDII code P0071 in a Buick?

Yes, dirt, debris, or obstructions around the sensor can affect its performance and trigger the P0071 code, so it's essential to keep the sensor clean and free from blockages.

9. Can a damaged or frayed wiring harness cause the OBDII code P0071 in a Buick related to the Ambient Air Temperature Sensor?

Yes, a damaged or frayed wiring harness can disrupt the electrical connection to the ambient air temperature sensor, leading to the P0071 fault code in the vehicle.

10. Are there any aftermarket solutions available to address the Ambient Air Temperature Sensor performance issue causing the OBDII code P0071 in a Buick?

While aftermarket sensors are available, it's recommended to use OEM parts to ensure compatibility and proper functioning of the ambient air temperature sensor in your Buick.