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P1111 Chevrolet Code - Intake Air Temperature Sensor Circuit Intermittent High Voltage

Quick Answer

The P1111 Chevrolet diagnostic trouble code indicates that there is an issue with the Intake Air Temperature (IAT) sensor circuit, specifically detecting intermittent high voltage. Common causes include Faulty Intake Air Temperature (IAT) sensor, Damaged or corroded wiring/connectors in the sensor circuit, ECM malfunction. 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 Chevrolet indicates Intake Air Temperature Sensor Circuit Intermittent High Voltage.
Common causes
Common causes include Faulty Intake Air Temperature (IAT) sensor, Damaged or corroded wiring/connectors in the sensor circuit, ECM malfunction.
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 10, 2024
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Code P1111 Chevrolet Description

The P1111 Chevrolet diagnostic trouble code indicates that there is an issue with the Intake Air Temperature (IAT) sensor circuit, specifically detecting intermittent high voltage. The IAT sensor is a crucial component of the vehicle's engine management system, as it measures the temperature of the incoming air into the engine. This information is used by the Engine Control Module (ECM) to adjust the air-fuel mixture for optimal combustion and engine performance.

OBDII Code P1111 Chevrolet - Intake Air Temperature Sensor Circuit Intermittent High Voltage
P1111 Chevrolet Code - Intake Air Temperature Sensor Circuit Intermittent High Voltage

Common Causes of P1111 Chevrolet

  1. Faulty Intake Air Temperature (IAT) sensor
  2. Damaged or corroded wiring/connectors in the sensor circuit
  3. ECM malfunction
  4. Intake air leaks near the sensor
  5. Incorrect sensor placement or mounting

Symptoms of P1111 Chevrolet

  1. Decreased fuel efficiency
  2. Rough idling or engine misfires
  3. Hesitation or lack of power during acceleration
  4. Check Engine Light illuminated
  5. Engine stalling or difficulty starting

How to Fix P1111 Chevrolet

  1. Begin by conducting a thorough visual inspection of the IAT sensor, wiring, and connectors to check for any visible damage or corrosion.
  2. Test the IAT sensor using a multimeter to ensure it is sending the correct voltage signal to the ECM.
  3. If the sensor is faulty, replace it with a new, OEM-equivalent sensor.
  4. Check and repair any damaged wiring or connectors in the sensor circuit.
  5. Clear the diagnostic trouble codes, reset the ECM, and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1111 Chevrolet

The typical repair costs for addressing the P1111 Chevrolet code can vary depending on the specific cause of the issue. In general, the cost of a new IAT sensor ranges from $30 to $100, while the labor cost for diagnosis and repair can range from $100 to $300. Overall, the total repair costs can range from $130 to $400. It's important to note that labor rates can vary significantly based on location and the type of repair shop, so it's advisable to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for P1111 Chevrolet

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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