AutoCodes – GMC – P0071 2018 GMC Sierra

P0071 2018 GMC Sierra 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 2018 GMC Sierra 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 250

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 2018 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 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 2018 GMC Sierra - Ambient Air Temperature Sensor Performance - AutoCodes.com — P0071 2018 GMC Sierra Code - Ambient Air Temperature Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P0071 2018 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 P0071 2018 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 P0071 2018 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 P0071 2018 GMC Sierra code?

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Need Help with the 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 P0071 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P0071 in a 2018 GMC Sierra related to the Ambient Air Temperature Sensor Performance?

The common symptoms include inaccurate temperature readings on the vehicle's display, issues with the climate control system, and potential effects on engine performance.

2. What are the possible causes of OBDII code P0071 in a 2018 GMC Sierra?

Possible causes include a faulty ambient air temperature sensor, wiring or connector issues, a damaged sensor, or a malfunction in the sensor circuit.

3. How can I diagnose the Ambient Air Temperature Sensor for performance issues related to code P0071 in my 2018 GMC Sierra?

You can diagnose the sensor by visually inspecting its wiring and connector, testing the sensor's resistance with a multimeter, and checking for any signs of physical damage to the sensor itself.

4. Can a bad Ambient Air Temperature Sensor affect the overall performance of my 2018 GMC Sierra?

Yes, a malfunctioning ambient air temperature sensor can impact the vehicle's fuel efficiency, emissions, and overall engine performance due to incorrect temperature readings provided to the engine control module.

5. What are some repair tips for fixing OBDII code P0071 in a 2018 GMC Sierra?

Repair tips include checking and cleaning the sensor connection, replacing the ambient air temperature sensor if necessary, and ensuring proper wiring and circuit integrity.

6. Is it safe to drive my 2018 GMC Sierra with OBDII code P0071 related to the Ambient Air Temperature Sensor Performance?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent any potential negative impacts on performance and fuel efficiency.

7. How much does it typically cost to repair OBDII code P0071 in a 2018 GMC Sierra at a professional mechanic's shop?

The cost of repairing this code can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can I reset the OBDII code P0071 in my 2018 GMC Sierra by disconnecting the battery?

While disconnecting the battery may reset the code temporarily, it is recommended to diagnose and fix the underlying issue causing the code to prevent it from reoccurring.

9. Will OBDII code P0071 in a 2018 GMC Sierra turn off on its own over time?

The code may turn off on its own if the issue is temporary, but it is best to diagnose and address the root cause to prevent potential long-term problems.

10. How can I prevent OBDII code P0071 related to the Ambient Air Temperature Sensor in my 2018 GMC Sierra from happening again in the future?

Regularly inspecting and maintaining the ambient air temperature sensor, keeping the sensor and its connections clean, and addressing any issues promptly can help prevent the code from recurring.