AutoCodes – Toyota – P0112 Toyota

P0112 Toyota Code - Intake Air Temperature Circuit Low Input

Quick Answer

The Intake Air Temperature (IAT), mounted on the Mass Air Flow meter sub-assembly, monitors the intake air temperature. Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor (Part of the Mass Air Flow [MAF] 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 Toyota indicates Intake Air Temperature Circuit Low Input.
Common causes: Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor (Part of the Mass Air Flow [MAF] 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 21,378

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 Aug 22, 2022

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

The Intake Air Temperature (IAT), mounted on the Mass Air Flow meter sub-assembly, monitors the intake air temperature. The intake air temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the intake air. When the intake air temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the Engine Control Module (ECM) as voltage changes.
The ECM monitors the sensor voltage and uses this value to calculate the intake air temperature. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the intake air temperature sensor circuit and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0112 Toyota - Intake Air Temperature Circuit Low Input - AutoCodes.com — P0112 Toyota Code - Intake Air Temperature Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0112 Toyota?

Dirty air filter
Faulty Intake Air Temperature (IAT) Sensor (Part of the Mass Air Flow [MAF] 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 Toyota?

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 Toyota 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 Toyota code?

Need more information on how to fix the P0112 Toyota code? Get Access to Factory Service Manuals

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Information for Specific Toyota Models

P0112 2006 Toyota Camry — Intake Air Temperature Circuit Low Input
P0112 2007 Toyota Camry — Intake Air Temperature Circuit Low Input
P0112 2008 Toyota Camry — Intake Air Temperature Circuit Low Input
P0112 2009 Toyota Camry — Intake Air Temperature Circuit Low Input
P0112 2010 Toyota Camry — Intake Air Temperature Circuit Low Input
P0112 2011 Toyota Camry — Intake Air Temperature Circuit Low Input
P0112 2001 Toyota Corolla — Intake Air Temperature Circuit Low Input 3ZZ-FE Engine
P0112 2002 Toyota Corolla — Intake Air Temperature Circuit Low Input 3ZZ-FE Engine
P0112 2003 Toyota Corolla — Intake Air Temperature Circuit Low Input 3ZZ-FE Engine
P0112 2004 Toyota Corolla — Intake Air Temperature Circuit Low Input 3ZZ-FE Engine
P0112 2005 Toyota Corolla — Intake Air Temperature Circuit Low Input 3ZZ-FE Engine
P0112 2006 Toyota Corolla — Intake Air Temperature Circuit Low Input 3ZZ-FE Engine
P0112 2001 Toyota Highlander — Intake Air Temperature Circuit Low Input
P0112 2002 Toyota Highlander — Intake Air Temperature Circuit Low Input
P0112 2003 Toyota Highlander — Intake Air Temperature Circuit Low Input
P0112 2004 Toyota Highlander — Intake Air Temperature Circuit Low Input
P0112 2005 Toyota Highlander — Intake Air Temperature Circuit Low Input
P0112 2006 Toyota Highlander — Intake Air Temperature Circuit Low Input
P0112 2007 Toyota Highlander — Intake Air Temperature Circuit Low Input
P0112 2004 Toyota Prius — Intake Air Temperature Circuit Low Input
P0112 2005 Toyota Prius — Intake Air Temperature Circuit Low Input
P0112 2006 Toyota Prius — Intake Air Temperature Circuit Low Input
P0112 2007 Toyota Prius — Intake Air Temperature Circuit Low Input
P0112 2008 Toyota Prius — Intake Air Temperature Circuit Low Input
P0112 2009 Toyota Prius — Intake Air Temperature Circuit Low Input
P0112 2013 Toyota RAV4 — Intake Air Temperature Circuit Low Input
P0112 2014 Toyota RAV4 — Intake Air Temperature Circuit Low Input
P0112 2015 Toyota RAV4 — Intake Air Temperature Circuit Low Input
P0112 2016 Toyota RAV4 — Intake Air Temperature Circuit Low Input
P0112 2017 Toyota RAV4 — Intake Air Temperature Circuit Low Input
P0112 2018 Toyota RAV4 — Intake Air Temperature Circuit Low Input

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.

Frequently Asked Questions about P0112 Toyota Code

1. What are the common symptoms of OBDII code P0112 in a Toyota vehicle?

The common symptoms of code P0112 include poor engine performance, decreased fuel efficiency, rough idling, and potential stalling.

2. What does the OBDII code P0112 indicate in a Toyota vehicle?

Code P0112 indicates that the Intake Air Temperature (IAT) sensor circuit is reporting a low input to the Engine Control Module (ECM).

3. What are the possible causes of OBDII code P0112 in a Toyota?

Possible causes of code P0112 include a faulty IAT sensor, damaged wiring or connectors in the IAT circuit, or issues with the ECM.

4. How can I diagnose the OBDII code P0112 in my Toyota?

You can diagnose code P0112 by using a scan tool to read the code, testing the IAT sensor, inspecting the wiring and connectors for damage, and checking the ECM for faults.

5. Can a dirty air filter trigger OBDII code P0112 in a Toyota?

Yes, a dirty air filter can disrupt the intake air temperature readings, potentially triggering code P0112. It is advisable to check and replace the air filter if necessary.

6. How can I repair OBDII code P0112 in my Toyota?

To repair code P0112, you may need to replace the faulty IAT sensor, repair any damaged wiring or connectors, or address any ECM issues causing the low input signal.

7. Is it safe to continue driving with OBDII code P0112 in a Toyota?

It is not recommended to continue driving with code P0112 unresolved, as it can lead to further engine issues and potential damage. It is best to address the problem promptly.

8. Can extreme weather conditions affect OBDII code P0112 in a Toyota?

Extreme weather conditions, such as very high or low temperatures, can impact the IAT sensor readings and potentially trigger code P0112. Ensure proper sensor functioning in such conditions.

9. How do I reset the OBDII code P0112 in my Toyota after making repairs?

After making necessary repairs, you can reset the OBDII code P0112 using an OBDII scan tool or by disconnecting the car's battery for a few minutes to clear the ECM memory.

10. Will code P0112 cause the check engine light to illuminate in a Toyota?

Yes, code P0112 will typically trigger the check engine light to illuminate in a Toyota vehicle, indicating a problem with the intake air temperature circuit.