AutoCodes – GMC – P0112 GMC

P0112 GMC Code - Intake Air Temperature Sensor Circuit Low Voltage

Quick Answer

The intake air temperature (IAT) sensor 1 is a variable resistor that measures the temperature of the air in the sensor bore. Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted. 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 GMC indicates Intake Air Temperature Sensor Circuit Low Voltage.
Common causes: Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted.
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 6,989

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 20, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0112 GMC Description

The intake air temperature (IAT) sensor 1 is a variable resistor that measures the temperature of the air in the sensor bore. The Engine Control Module (ECM) supplies 5 V to the IAT sensor 1 signal circuit and a ground for the IAT sensor 1 low reference circuit. The signal varies with inlet air temperature and is displayed by the scan tool as °C (°F). The multifunction intake air sensor houses the IAT sensor 1, IAT sensor 2, Humidity sensor, Mass Air Flow (MAF) sensor and BARO pressure sensor. The Diagnostic Trouble Code (DTC) ECM detects that the IAT sensor 1 signal is warmer than 149°C (300°F) for greater than 5 s.

OBDII Code P0112 GMC - Intake Air Temperature Sensor Circuit Low Voltage - AutoCodes.com — P0112 GMC Code - Intake Air Temperature Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0112 GMC?

Dirty air filter
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 P0112 GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0112 GMC 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 P0112 GMC code?

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Information for Specific GMC Models

P0112 2014 GMC Sierra — Intake Air Temperature Sensor Circuit Low Voltage
P0112 2015 GMC Sierra — Intake Air Temperature Sensor Circuit Low Voltage
P0112 2016 GMC Sierra — Intake Air Temperature Sensor Circuit Low Voltage
P0112 2017 GMC Sierra — Intake Air Temperature Sensor Circuit Low Voltage
P0112 2018 GMC Sierra — Intake Air Temperature Sensor Circuit Low Voltage

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.