Intake Air Temperature Sensor 1 Circuit High Input
The P0113 code means the vehicle's onboard diagnostic system has detected: Intake Air Temperature Sensor 1 Circuit High Input. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $15-$150
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Common Symptoms
- Check Engine Light on
- Engine may run rich (PCM reads the air as very cold and adds fuel)
- Possible hesitation
- Slightly reduced power
Probable Causes (Ranked by Likelihood)
- IAT sensor open circuit (no reading) Very High
- Open signal wire between sensor and PCM High
- Sensor connector unplugged Moderate
- Failed sensor stuck reading extreme cold (high-voltage default near -40F) Moderate
Step-by-Step Diagnostic Procedure
-
Check IAT voltage: above 4.7V at any temperature indicates an open circuit.
-
Disconnect and reconnect the IAT sensor connector. If the code clears, the connector was loose.
-
Check wiring continuity from sensor to PCM.
-
Measure IAT sensor resistance and compare to temperature specification chart.
-
Replace sensor if open internally.
Common Fixes by Vehicle
What techs usually find when diagnosing P0113 on specific vehicles — tap your vehicle for the fix and the exact part:
2009-2020 Ford F-150/Explorer 3.5L/5.0L easy DIY
The intake air temperature (IAT) sensor is integrated into the MAF sensor on Ford trucks. If the IAT reads -40F or extremely high, the sensor element has failed. Replace the entire MAF/IAT assembly (Motorcraft DY-1350). Check the wiring connector for backed-out pins first. Also verify the air filter is not restricting airflow and causing heat soak.
Labor: 15 min (connector check), 30 min (MAF replacement)2007-2017 Toyota Camry/Corolla 2.5L easy DIY
The IAT sensor on Toyota is integrated into the MAF sensor assembly. Check the connector for corrosion or water intrusion -- the connector sits low in the air box area and is exposed to moisture. If the signal reads high (above 4.9V), the circuit is open. Replace the MAF/IAT assembly (Denso 197-6040). Also inspect the air filter box for water entry.
Labor: 10 min (connector), 20 min (MAF replacement)2010-2020 Chevrolet Silverado/Equinox 5.3L/2.4L easy DIY
GM uses a standalone IAT sensor on some models and an integrated MAF/IAT on others. Check your model first. The standalone IAT sensor (ACDelco 213-4663) is in the intake duct. Test resistance -- should be about 2.5K ohms at 68F. If resistance is too low (reads high temp), replace the sensor. Also check for a damaged air intake duct allowing hot engine air in.
Labor: 15 minFrequently Asked Questions
A high IAT input makes the ECU think the air is very cold -- what does that do?
A high signal voltage corresponds to high sensor resistance, which the PCM reads as extremely cold intake air (often defaulting near -40F). Because cold air is denser, the PCM adds fuel, so the engine tends to run rich -- this can cause hard cold starts, over-fueling, reduced fuel economy, and in severe cases fouled spark plugs.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0113 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
See All Codes & Fixes for Your Vehicle
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