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P0112 2016 GMC Sierra Code - Intake Air Temperature Sensor Circuit Low Voltage

Quick Answer

The P0112 code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the intake air temperature (IAT) sensor circuit. Common causes include Faulty IAT Sensor: The sensor itself may be defective or malfunctioning, Wiring Issues: Damaged, corroded, or shorted wiring in the IAT sensor circuit can lead to low voltage readings, Connector Problems: Loose, corroded, or damaged connectors that link the IAT sensor to the ECM. 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
P0112 2016 GMC Sierra indicates Intake Air Temperature Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty IAT Sensor: The sensor itself may be defective or malfunctioning, Wiring Issues: Damaged, corroded, or shorted wiring in the IAT sensor circuit can lead to low voltage readings, Connector Problems: Loose, corroded, or damaged connectors that link the IAT sensor to the ECM.
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 Oct 02, 2024
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Code P0112 2016 GMC Sierra Description

The P0112 code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the intake air temperature (IAT) sensor circuit. The IAT sensor is critical for measuring the temperature of the air entering the engine, which plays a significant role in the engine's air-fuel mixture calculations. When the IAT sensor sends a low voltage signal, it suggests that the sensor may be malfunctioning, there is a wiring issue, or there is a problem with the ECM itself.

OBDII Code P0112 2016 GMC Sierra - Intake Air Temperature Sensor Circuit Low Voltage
P0112 2016 GMC Sierra Code - Intake Air Temperature Sensor Circuit Low Voltage

Common Causes of P0112 2016 GMC Sierra

  1. Faulty IAT Sensor: The sensor itself may be defective or malfunctioning.
  2. Wiring Issues: Damaged, corroded, or shorted wiring in the IAT sensor circuit can lead to low voltage readings.
  3. Connector Problems: Loose, corroded, or damaged connectors that link the IAT sensor to the ECM.
  4. ECM Malfunction: A failure in the engine control module could misinterpret the sensor's readings.
  5. Intake Air Leaks: Air leaks in the intake system can cause erroneous temperature readings.

Symptoms of P0112 2016 GMC Sierra

  1. Poor Fuel Economy: Increased fuel consumption due to incorrect air-fuel mixture adjustments.
  2. Rough Idling: The engine may run unevenly or stall at idle due to improper fuel delivery.
  3. Check Engine Light: The illumination of the check engine light on the dashboard as the ECM detects the fault.
  4. Reduced Engine Performance: Noticeable lack of power during acceleration or difficulty maintaining speed.
  5. Hard Starting: Difficulty starting the engine, particularly in colder weather conditions.

How to Fix P0112 2016 GMC Sierra

  1. Visual Inspection: Start with a thorough visual inspection of the IAT sensor, wiring, and connectors for any signs of damage or corrosion.
  2. Test the IAT Sensor: Use a multimeter to check the resistance of the IAT sensor at various temperatures to determine if it is functioning correctly.
  3. Check Wiring and Connectors: Inspect the wiring harness for continuity and ensure that all connectors are secure and free from corrosion.
  4. Replace the IAT Sensor: If the sensor is found to be faulty, replace it with a new one, ensuring proper installation.
  5. Clear Codes and Test Drive: After repairs, clear the trouble codes using a scan tool and perform a test drive to ensure the issue is resolved and the check engine light does not reappear.

Cost to Fix P0112 2016 GMC Sierra

The typical repair costs for addressing a P0112 code can range from $100 to $300. This estimate includes the cost of parts, such as a new IAT sensor (approximately $30 to $100), and labor charges, which can vary based on the shop's hourly rate. Labor rates commonly range from $80 to $150 per hour, depending on the location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops often charge less. It is advisable to check local rates for a more precise estimate and to consider any additional diagnostics that may be necessary to pinpoint the issue accurately.

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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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