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Engine-Codes – GMC – P1111 2014 GMC Sierra

P1111 2014 GMC Sierra Code - Intake Air Temperature Sensor Circuit Intermittent High Voltage

Quick Answer

The P1111 diagnostic trouble code for a 2014 GMC Sierra indicates an issue with the Intake Air Temperature (IAT) sensor circuit experiencing intermittent high voltage. Common causes include Faulty IAT Sensor: The most common cause of the P1111 code is a malfunctioning or failing IAT sensor, Wiring Issues: Damaged or corroded wiring in the IAT sensor circuit can lead to intermittent high voltage readings, ECM Malfunction: A malfunctioning engine control module (ECM) can also trigger the P1111 code by misinterpreting the signals from the IAT sensor. 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
P1111 2014 GMC Sierra indicates Intake Air Temperature Sensor Circuit Intermittent High Voltage.
Common causes
Common causes include Faulty IAT Sensor: The most common cause of the P1111 code is a malfunctioning or failing IAT sensor, Wiring Issues: Damaged or corroded wiring in the IAT sensor circuit can lead to intermittent high voltage readings, ECM Malfunction: A malfunctioning engine control module (ECM) can also trigger the P1111 code by misinterpreting the signals from the IAT sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code P1111 2014 GMC Sierra Description

The P1111 diagnostic trouble code for a 2014 GMC Sierra indicates an issue with the Intake Air Temperature (IAT) sensor circuit experiencing intermittent high voltage. The IAT sensor is a crucial component of the vehicle's engine management system, as it measures the temperature of the air entering the engine. This information is used by the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion and performance.

OBDII Code P1111 2014 GMC Sierra - Intake Air Temperature Sensor Circuit Intermittent High Voltage
P1111 2014 GMC Sierra Code - Intake Air Temperature Sensor Circuit Intermittent High Voltage

Common Causes of P1111 2014 GMC Sierra

  1. Faulty IAT Sensor: The most common cause of the P1111 code is a malfunctioning or failing IAT sensor.
  2. Wiring Issues: Damaged or corroded wiring in the IAT sensor circuit can lead to intermittent high voltage readings.
  3. ECM Malfunction: A malfunctioning engine control module (ECM) can also trigger the P1111 code by misinterpreting the signals from the IAT sensor.
  4. Poor Electrical Connections: Loose or poor electrical connections in the IAT sensor circuit can cause intermittent high voltage readings.

Symptoms of P1111 2014 GMC Sierra

  1. Check Engine Light: The most common symptom associated with the P1111 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: The engine may experience decreased fuel efficiency due to incorrect air-fuel mixture adjustments.
  3. Rough Idling: The engine may idle roughly or inconsistently due to the inaccurate temperature readings from the IAT sensor.
  4. Engine Misfires: Intermittent high voltage from the IAT sensor can lead to engine misfires, causing a lack of power and rough running.

How to Fix P1111 2014 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the IAT sensor and its circuit.
  2. Replace the IAT Sensor: If the sensor is faulty, replace it with a new, OEM-quality sensor to ensure accurate temperature readings.
  3. Check Wiring and Connections: Inspect the wiring harness and connectors for any damage or corrosion, repairing or replacing as necessary.
  4. Clear Codes and Test Drive: Clear the trouble codes from the ECM, and test drive the vehicle to ensure the issue has been resolved.
  5. Monitor Performance: Keep an eye on the vehicle's performance and check for any recurring issues that may indicate further problems.

Cost to Fix P1111 2014 GMC Sierra

The typical repair costs for addressing the P1111 code on a 2014 GMC Sierra can range from $100 to $300, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to inquire about local rates for a more accurate estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

What does this mean?

Tech Notes for P1111 2014 GMC Sierra

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.

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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.

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