P0113
Moderate Severity

P0113 Code Definition: Intake Air Temperature Sensor 1 Circuit High Input

Diagnostic Trouble Code (DTC) P0113 is a standard OBD-II code triggered by the ECU when it detects a performance issue. Learn how to diagnose, inspect, and resolve this code below.

What does OBD2 code P0113 mean?

The engine control module (ECM) or powertrain control module (PCM) sets code P0113 when it registers that the Intake Air Temperature Sensor 1 Circuit High Input performance has fallen below the manufacturer's required baseline. This triggers your vehicle's malfunction indicator lamp (MIL), commonly known as the Check Engine Light.

Is It Safe to Drive with Code P0113?

Yes, but the ECU will fall back to a default air temperature baseline, which can cause slightly rough starting, reduced engine efficiency, and poorer performance in hot or cold weather.

Symptoms of OBD2 Code P0113

Depending on your car model, symptoms for P0113 may vary. The most typical symptoms include:

  • Check Engine Light illuminated
  • Slightly rough cold starts
  • Poor engine response and reduced fuel economy

What Causes Code P0113?

A variety of physical faults can trigger the P0113 code. Here are the most frequent culprits:

  • Faulty Intake Air Temperature (IAT) sensor
  • Disconnected or corroded IAT sensor plug
  • Damaged wiring harness between IAT and ECU
  • Dirty air filter causing restricted flow (rarely triggers Circuit High)

Step-by-Step Diagnostic Routine

Before replacing any expensive components, run through these standardized troubleshooting steps:

  1. Use OBDAssistant to read live IAT data. If it reads a constant cold value (like -40°F), there is an open circuit.
  2. Check if the IAT connector is plugged in securely.
  3. Inspect the IAT sensor wiring for breaks, pinches, or rub marks.

Expected Repair Costs for P0113

$30 - $120. The IAT sensor is often built into the MAF sensor, making replacement a simple plug-and-play process.

Save on Diagnosis with OBDAssistant

OBDAssistant shows real-time Intake Air Temperature. If the temp value is locked at extreme freezing limits (-40°), you know immediately that you have a disconnected sensor or broken wire.

Frequently Asked Questions

What does IAT Circuit High mean?

It means the ECU is detecting a voltage return signal higher than normal, which indicates a break in the wire (open circuit).

Where is the IAT sensor located?

It is typically located in the air intake duct or integrated directly inside the Mass Air Flow (MAF) sensor assembly.