AutoCodes – Buick – P0111 Buick

P0111 Buick Code - Intake Air Temperature Circuit Range/Performance Problem

Quick Answer

The Intake Air Temperature (IAT) sensor 1 is a variable resistor that changes the voltage on the Engine Control Module (ECM) supplied 5 V signal circuit. Common causes include Faulty Intake Air Temperature (IAT) sensor, Intake Air Temperature sensor harness is open or shorted, Intake 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: P0111 Buick indicates Intake Air Temperature Circuit Range/Performance Problem.
Common causes: Common causes include Faulty Intake Air Temperature (IAT) sensor, Intake Air Temperature sensor harness is open or shorted, Intake 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 2,198

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0111 Buick Description

The Intake Air Temperature (IAT) sensor 1 is a variable resistor that changes the voltage on the Engine Control Module (ECM) supplied 5 V signal circuit. The signal varies with inlet air temperature in the sensor bore and is displayed by the scan tool as °C (°F). The IAT sensor 2 and the humidity sensor share the same circuit. The IAT sensor 2 signal is displayed by the scan tool as Hertz (Hz) and °C (°F). The Diagnostic Trouble Code (DTC) will be set when the ECM determines the absolute difference between the IAT sensor 1 start-up temperature and the IAT sensor 2 start-up temperature is greater than 25°C (45°F).

OBDII Code P0111 Buick - Intake Air Temperature Circuit Range/Performance Problem - AutoCodes.com — P0111 Buick Code - Intake Air Temperature Circuit Range/Performance Problem

What does this mean?

What are the Possible Causes of the DTC P0111 Buick?

Faulty Intake Air Temperature (IAT) sensor
Intake Air Temperature sensor harness is open or shorted
Intake Air Temperature sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0111 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 does this mean?

Code Tech Notes

The Intake Air Temperature (IAT) sensor 1, IAT sensor 2, Humidity sensor, MAF sensor, and BARO pressure sensor are integrated within the Mass Air Flow / Multifunction Intake Air Sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0111 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.

Need more information about the P0111 Buick code?

Need more information on how to fix the P0111 Buick code? Get Access to Factory Service Manuals

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 P0111 Buick Code

1. What are the common symptoms of OBDII code P0111 in a Buick?

Symptoms may include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.

2. What does the OBDII code P0111 for a Buick indicate?

This code signals an issue with the Intake Air Temperature (IAT) sensor circuit, specifically a range/performance problem.

3. What are the possible causes of the P0111 code in a Buick?

Potential causes include a faulty IAT sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

4. How can I diagnose the P0111 code in my Buick?

Diagnosis typically involves checking the IAT sensor for proper operation, inspecting the sensor circuit for any damage, and using a scan tool to monitor data from the sensor.

5. Can a dirty air filter trigger the P0111 code in a Buick?

Yes, a dirty air filter can affect the IAT sensor readings and potentially lead to the P0111 code being triggered.

6. Are there any simple repairs I can try to fix the P0111 code in my Buick?

You can start by checking and cleaning the IAT sensor, inspecting the sensor's wiring and connectors for damage, and ensuring proper air filter maintenance.

7. Should I replace the IAT sensor if I get the P0111 code in my Buick?

If the sensor is found to be faulty during diagnosis, replacing it with a new one is a common repair to resolve the P0111 code.

8. Can driving with the P0111 code in my Buick cause further damage to the vehicle?

Continued driving with the P0111 code may result in poor engine performance and reduced fuel efficiency but is unlikely to cause major damage if addressed promptly.

9. How much does it typically cost to repair the P0111 code in a Buick?

The cost of repairs for the P0111 code can vary based on the cause of the issue, but it may range from $100 to $300 for parts and labor.

10. Is it safe to continue driving my Buick with the P0111 code illuminated?

While driving with the P0111 code may be possible, it is recommended to address the issue promptly to prevent potential further damage and ensure optimal vehicle performance.