What does P0113 mean?

The IAT circuit voltage is above range, which usually points to an open circuit or a bad sensor.

Why does the scan tool show -40 with P0113?

An open circuit makes the ECU read the lowest possible temperature, which is often shown as -40.

Engine sensors

P0113 — Intake Air Temperature Sensor 1 Circuit High

The IAT sensor signal is higher than the normal range, which the ECU reads as extremely cold air (usually an open circuit). The ECU may enrich the mixture.

Severity: Low

Common causes

Open circuit or broken wire to the IAT sensor
Faulty IAT sensor
Corroded or loose connector
Sensor ground fault
Faulty MAF sensor with built-in IAT

Symptoms

Slightly higher fuel use
Rough idle when cold
Black smoke in some cases
Check engine light

How to check

Check the connector and wiring for an open circuit
Read the IAT value; an open circuit often shows a very low temperature such as -40 deg C
Measure the sensor resistance and compare it with the temperature
Replace the sensor if needed

Can you keep driving?

Usually drivable. The effect is small, but repair it so fuel control stays accurate.

Frequently asked questions

What does P0113 mean?: The IAT circuit voltage is above range, which usually points to an open circuit or a bad sensor.
Why does the scan tool show -40 with P0113?: An open circuit makes the ECU read the lowest possible temperature, which is often shown as -40.

General reference information. It does not replace a diagnosis on your own vehicle. The same code can have different causes depending on make, model year and engine; check the manufacturer's documentation or ask a technician with a scan tool.