One essential part of smooth engine operation is a good air to fuel ratio. There are several systems within your vehicle that monitor the density, flow speed, and temperature of the air in the engine. When one of these systems break down, it can lead to very serious problems and eventual engine damage.
One of these systems is the intake air temperature sensor. It keeps track of the air coming into the engine to help maintain the right mix. When it puts out a higher voltage than usual, the P0113 code will trigger.
The P0113 trouble code is an early warning—not serious on its own, but something you should address before it becomes more serious. Since the problem that triggers P0113 is likely intermittent, it can be difficult to diagnose. The freeze frame data on your OBD2 scan tool will go a long way toward finding the root cause of this code.
P0113 Code Definition
- P0113 Code Definition (Generic): Intake air temperature sensor 1 circuit high input
- P0113 Chevy Code Definition: Intake air temperature circuit high input
- P0113 Chrysler Code Definition: Intake air temperature sensor 1 circuit high
- P0113 Dodge Code Definition: Intake air temperature sensor 1 circuit high
- P0113 Ford Code Definition: Intake air temperature sensor circuit high input
- P0113 Honda Code Definition: Intake air temperature sensor circuit high voltage
- P0113 Nissan Code Definition: Intake air temperature sensor circuit high
- P0113 Toyota Code Definition: Intake air temperature circuit high input
- P0113 Volkswagen Code Definition: Intake air temperature sensor 1 circuit high
What Does P0113 mean?
The intake air temperature (IAT) sensor analyzes the air density and temperature in your car’s engine. This information is used to tell the engine how much fuel to release and how much spark is needed. By varying these aspects, the engine can better maintain consistent fuel economy in all weather conditions.
The IAT uses a thermistor operation. This means the resistance of the circuit changes based on the temperature, going up as the temperature rises. By monitoring the voltage of the IAT, the engine can determine the temperature of the air inside.
The P0113 OBD2 code triggers when the engine control unit detects a voltage above the typical 4.91 reference volts. This indicates to the ECU that there’s an open circuit connected to the IAT sensor, which may cause failure if not addressed.
What Are The Symptoms Of The P0113 Code?
You probably won’t notice any drivability issues when the P0113 trouble code is active. Having said that, symptoms are specific to the design of the engine control unit. This means they can vary depending on what kind of car you drive. Typical symptoms include:
- Activation of the check engine light
- Difficulty starting the engine
- Too much air in the air-to-fuel ratio
- Pre-ignition problems due to lean engine conditions
What Are The Causes Of P0113?
- IAT sensor is faulty or loose
- Wires around IAT sensor are damaged or loose
- Open circuit in IAT system
- Faulty PCM (rare)
How Serious Is The P0113 Code?
The P0113 trouble code is moderately severe. You can drive your car for short periods while the code is active, but you should repair it as soon as possible. Too much air in your engine can lead to misfires and other more serious problems. These can be costly fixes, so you’ll save yourself both time and money by addressing this trouble code promptly.
How To Diagnose The P0113 Code
While P0113 is a generic powertrain code, the repair tends to be specific to your vehicle’s make and model. Check to see if any technical service bulletins have been released for your vehicle before beginning your diagnosis.
Tools You’ll Need:
- Scan for related trouble codes, including P0095-P0099, P0110, P0111, P0112, P0114, and P0127. The presence of these codes can help you hone in on the issue.
- Read the freeze frame data to see what conditions were present when the code was first set. This is especially helpful in fixing intermittent problems.
- Start your car and let it warm up for 5-10 minutes. Check your engine’s air temperature and compare it with the coolant temperature. If your car is working properly, the air temperature should be slightly lower than the coolant temperature.
- Connect a jumper wire between the harness and the ground. This should max out the IAT temperature reading. If it doesn’t, there is an issue with the wiring. If it does max out, check the ground circuit. If there is no reading on your scan tool, there is an open circuit that needs to be repaired.
- Inspect the wires around the IAT sensor for damage, corrosion, and loose connections.
- Remove your IAT for testing. Use a multimeter to check the resistance. Apply heat to the tip of the sensor. The resistance should decrease. If there’s no change, or a reading of infinite resistance, the IAT should be replaced.
Common Mistakes To Avoid While Diagnosing The P0113 Code
Always give the wires of your system a visual inspection when you have a problem with a sensor. A corroded or damaged wire is a very quick and easy fix compared to an IAT sensor.
If there are any recommended repairs indicated by your manufacturer, do those first, and follow the instructions to the letter. Many people treat this code as generic when the repair is specific to their vehicle.
What Should You Do To Fix The Code P0113?
Start your repairs by clearing the codes and taking a test drive, replicating the conditions in which the error initially occurred. In some instances, the minor repairs made during diagnosis are enough to clear this code. Do the same between steps of the repair to ensure you’re not doing unnecessary work.
- Replace the IAT sensor if it failed any of the diagnostic tests above.
- Replace the wiring around the IAT sensor, even if you don’t see any damage. Internal corrosion can be invisible to the naked eye.
- If none of these repairs clear the code, you may have a more serious issue with your engine control module or PCM. Take your vehicle to a mechanic for further diagnosis.
Tips To Avoid P0113 In The Future
More often than not, P0113 is trigged by a short in the harness and wiring of the IAT sensor. The best way to prevent shorts is to make sure all wires are securely connected. Also check that they’re not touching any parts of the engine that could cause damage and corrosion.