P0113
UniversalThe Engine Control Module (ECM) detects that the signal voltage from the Intake Air Temperature (IAT) sensor is higher than expected, indicating a very low temperature or an open circuit.
Medium SeverityThe Intake Air Temperature (IAT) sensor measures the temperature of air entering the engine. A P0113 code means the computer is receiving an unusually high voltage signal from this sensor, suggesting the incoming air is extremely cold or there's an open circuit. This can cause the engine to run inefficiently, impacting fuel economy and emissions, and may lead to rough idling or hesitant acceleration.
⚠️ Before You Begin (Safety First)
Always allow the engine to cool completely before working on it to prevent burns. Disconnect the negative battery terminal before inspecting or replacing electrical components to avoid electrical shock or damage to the vehicle's electrical system.
Common Symptoms
- Check Engine Light illuminated
- Poor fuel economy
- Rough idle
- Hesitation or poor acceleration
- Increased exhaust emissions
- Engine may run rich
Common Causes
- Faulty Intake Air Temperature (IAT) sensor
- Open circuit or short to voltage in the IAT sensor wiring
- Corrosion or poor connection at the IAT sensor connector
- Faulty Engine Control Module (ECM) (rare)
Frequently reported on: Honda Civic (2001-2005), Ford F-150 (2004-2008), Toyota Camry (2002-2006), Chevrolet Silverado (2000-2006), Jeep Grand Cherokee (1999-2004)
Diagnostic Steps
- Locate the Intake Air Temperature (IAT) sensor. It's often found in the intake manifold, air intake tube, or mass airflow sensor housing.
- Inspect the electrical connector and wiring for any signs of damage, corrosion, or loose connections. Clean or repair as necessary.
- Disconnect the IAT sensor and test its resistance using a multimeter at varying temperatures (if accessible and safe to do so) to check its functionality against manufacturer specifications.
- If the sensor is faulty, replace it with a new one. Ensure the new sensor is compatible with your vehicle.
- Clear the P0113 code using an OBD-II scanner and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
If after replacing the Intake Air Temperature sensor the code persists, or if visual inspection reveals no obvious wiring damage, it's advisable to consult a professional technician. Complex wiring diagnostics or potential issues with the Engine Control Module (ECM) require specialized tools and expertise.
Commonly Asked Questions
What is the Intake Air Temperature (IAT) sensor and what does it do?
The IAT sensor measures the temperature of the air entering the engine. This information is used by the engine's computer (ECM) to adjust fuel delivery and ignition timing for optimal performance and emissions.
Can I drive with a P0113 code?
While your car may still run, it's not recommended for extended periods. The P0113 code can lead to reduced fuel economy, increased emissions, and potentially poor engine performance, which could indirectly cause further issues over time.
Is replacing the IAT sensor difficult?
For many vehicles, replacing the IAT sensor is a relatively easy DIY task, often requiring only basic hand tools and about an hour. The sensor is usually easily accessible in the air intake system.
What if replacing the IAT sensor doesn't fix the code?
If the code persists after replacing the sensor, the issue likely lies with the wiring harness connecting the sensor to the ECM, or less commonly, with the ECM itself. At this point, professional diagnosis is recommended.
How does the P0113 code cause high input?
A high input means the ECM is receiving a voltage signal that is higher than its normal operating range. For an IAT sensor, this usually indicates an open circuit, a short to voltage, or the sensor failing in a way that makes it read extremely low (cold) temperatures, which translates to a high resistance and thus a high voltage signal to the ECM.