AutoCodes – GMC – P0071 GMC

P0071 GMC 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 GMC 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 774

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

What does this mean?

What are the Possible Causes of the DTC P0071 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 P0071 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 P0071 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 P0071 GMC code?

Need more information on how to fix the P0071 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0071 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0071 2014 GMC Sierra — Ambient Air Temperature Sensor Performance
P0071 2015 GMC Sierra — Ambient Air Temperature Sensor Performance
P0071 2016 GMC Sierra — Ambient Air Temperature Sensor Performance
P0071 2017 GMC Sierra — Ambient Air Temperature Sensor Performance
P0071 2018 GMC Sierra — Ambient Air Temperature Sensor Performance

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 GMC Code

1. What are the common symptoms of OBDII code P0071 GMC (Ambient Air Temperature Sensor Performance)?

- Common symptoms include inaccurate temperature readings on the dashboard, issues with the vehicle's climate control system, and potential impact on engine performance.

2. What are the possible causes of OBDII code P0071 GMC?

- The code P0071 GMC typically indicates a fault with the ambient air temperature sensor or its circuit. Common causes include sensor malfunction, wiring issues, or a faulty connection.

3. How can I diagnose the Ambient Air Temperature Sensor to confirm if it is causing the P0071 code?

- You can use a multimeter to test the sensor's resistance and voltage readings. Additionally, visually inspect the sensor and its wiring for any signs of damage or corrosion.

4. Can a faulty Ambient Air Temperature Sensor cause other problems besides triggering the P0071 code?

- Yes, a malfunctioning ambient air temperature sensor can impact the accuracy of your vehicle's temperature display, affect the climate control system, and potentially lead to poor engine performance.

5. What is the typical repair for OBDII code P0071 GMC related to the Ambient Air Temperature Sensor?

- The most common repair involves replacing the faulty ambient air temperature sensor. Ensure the sensor is properly calibrated and securely installed to prevent future issues.

6. Should I clear the OBDII code P0071 GMC after replacing the Ambient Air Temperature Sensor?

- Yes, it is recommended to clear the code after replacing the sensor to reset the system and verify that the issue has been resolved.

7. Can I drive my vehicle with OBDII code P0071 GMC present?

- While it may be possible to drive with the code present, it is advisable to address the underlying issue promptly to prevent potential complications and ensure optimal vehicle performance.

8. How do I reset the OBDII code P0071 GMC without a diagnostic tool?

- You can try disconnecting the vehicle's battery for a few minutes to reset the codes. However, using a diagnostic tool is the most effective way to clear the code and monitor the system.

9. Are there any preventive maintenance tips to avoid encountering OBDII code P0071 GMC in the future?

- Regularly inspect and maintain your vehicle's ambient air temperature sensor, wiring, and connections to prevent issues that could trigger the P0071 code.

10. Can extreme weather conditions impact the performance of the Ambient Air Temperature Sensor and trigger the P0071 code?

- Yes, extreme heat or cold temperatures can affect the ambient air temperature sensor's accuracy and performance, potentially leading to the triggering of the P0071 code.