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Engine-Codes – GMC – P0112 2018 GMC Sierra

P0112 2018 GMC Sierra Code - Intake Air Temperature Sensor Circuit Low Voltage

Quick Answer

The P0112 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Intake Air Temperature (IAT) sensor circuit is registering a low voltage. Common causes include Faulty IAT sensor, Damaged wiring or 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
P0112 2018 GMC Sierra indicates Intake Air Temperature Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty IAT sensor, Damaged wiring or 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 Aug 19, 2024
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Code P0112 2018 GMC Sierra Description

The P0112 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Intake Air Temperature (IAT) sensor circuit is registering a low voltage. The IAT sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for determining the air-fuel mixture needed for combustion. When the sensor detects a low voltage, it can lead to incorrect air-fuel ratios, affecting engine performance and emissions.

OBDII Code P0112 2018 GMC Sierra - Intake Air Temperature Sensor Circuit Low Voltage
P0112 2018 GMC Sierra Code - Intake Air Temperature Sensor Circuit Low Voltage

Common Causes of P0112 2018 GMC Sierra

  1. Faulty IAT sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. ECM malfunction
  4. Intake air leaks
  5. Dirty air filter

Symptoms of P0112 2018 GMC Sierra

  1. Poor fuel economy
  2. Reduced engine power
  3. Rough idling
  4. Stalling
  5. Check engine light illuminated

How to Fix P0112 2018 GMC Sierra

  1. Begin by locating the IAT sensor on the intake manifold or air intake duct.
  2. Inspect the sensor and its wiring for any visible damage or corrosion.
  3. Test the sensor's resistance using a multimeter to determine if it is faulty.
  4. If the sensor is faulty, replace it with a new one.
  5. Clear the DTC using a scan tool and test drive the vehicle to ensure the code does not return.

Cost to Fix P0112 2018 GMC Sierra

The typical repair costs for addressing a P0112 code on a 2018 GMC Sierra can range from $100 to $300, depending on the cost of the new IAT sensor and any additional labor charges. It's important to note that prices can vary based on location, the specific repair shop, and any other necessary parts or services required to resolve the issue.

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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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