Understanding P0113: Intake Air Temperature Circuit High Input

What is P0113 Code?

P0113 is an OBD-II trouble code that is triggered when your vehicle’s Engine Control Module (ECM) detects that the intake air temperature (IAT) sensor circuit is reporting a high input, meaning it’s too hot compared to the actual air temperature.

Understanding the Intake Air Temperature Sensor

You may ask, “What is the Intake Air Temperature Sensor?” It’s a key part of your car’s engine management system. It monitors the temperature of the air entering your engine and relays this information to the ECM.

How the Intake Air Temperature Sensor Works

Ever wondered how this little device works? The IAT sensor changes its internal resistance in response to changes in air temperature. The ECM then interprets this resistance signal as a temperature reading, which it uses to adjust fuel delivery and spark timing.

Causes of P0113 Code

What could cause the P0113 code to appear? There could be several reasons.

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Faulty Intake Air Temperature Sensor

The most common cause is a faulty IAT sensor. It might be sending incorrect temperature readings to the ECM, causing it to misinterpret the data.

Damaged or Loose Wiring

Damaged or loose wiring in the IAT sensor circuit can also trigger the P0113 code. If the wires are broken or disconnected, the ECM might receive a high input signal.

Engine Control Unit Problems

Though less common, problems with the ECM itself can also cause the P0113 code.

Symptoms of P0113 Code

How do you know if your vehicle has a P0113 problem? Here are some symptoms:

Check Engine Light

The check engine light is usually the first sign. It’s the car’s way of telling you something is wrong.

Poor Fuel Economy

If the ECM gets a high temperature reading, it will adjust the fuel mixture accordingly. This can result in a less efficient fuel-air mix and poorer fuel economy.

Difficult Starting and Poor Performance

A high IAT reading can cause issues with the car’s ignition and overall performance.

How to Diagnose and Fix the P0113 Code

So, what can you do if you encounter the P0113 code?

Initial Diagnostic Steps

First off, don’t panic! Start with some initial diagnostic steps.

Use of Diagnostic Tools

A professional scanner tool can help read and interpret the error code. This tool can also monitor real-time data from the IAT sensor.

Prevention Measures for P0113 Code

Prevention is better than cure, right? Let’s look at some preventive measures.

Regular Vehicle Maintenance

Regular maintenance is crucial. This includes periodic checks of the IAT sensor and the electrical wiring.

Prompt Response to Check Engine Light

Respond promptly to the check engine light. Ignoring it might lead to more serious issues down the line.


Understanding the P0113 code is crucial for vehicle owners and technicians. Regular maintenance and prompt response to trouble codes can prevent serious engine issues and expensive repairs. Remember, your car is an investment and keeping it in top shape should be a priority.


  1. What does the P0113 code mean? P0113 is an OBD-II trouble code that signifies a high input problem with the intake air temperature sensor circuit.
  2. What causes the P0113 code? The most common causes are a faulty IAT sensor, damaged or loose wiring, and ECM issues.
  3. What are the symptoms of a P0113 code? Symptoms include a lit check engine light, poor fuel economy, and issues with starting and performance.
  4. How can I fix the P0113 code? Start with a visual inspection of the IAT sensor and wiring. A diagnostic tool can also help identify the issue. In some cases, professional help may be required.
  5. How can I prevent the P0113 code? Regular vehicle maintenance, including periodic checks of the IAT sensor and wiring, can help prevent this issue. Also, always respond promptly to a check engine light.