P0113 is the OBD-II trouble code for a high input on the intake air temperature (IAT) sensor circuit in Honda vehicles.
In plain terms, the IAT sensor helps the engine computer gauge the temperature of incoming air so it can adjust fuel delivery and ignition timing. When the ECU detects a signal that indicates an abnormally high intake air temperature, P0113 is triggered. This can affect performance, fuel economy, and emissions readiness, and may illuminate the check engine light.
What P0113 means for your Honda
On most Hondas, P0113 indicates the IAT sensor circuit is sending a voltage or resistance reading that the ECU interprets as unusually high air temperature. The IAT sensor is a thermistor located in the intake tract, and its readings help the ECU determine how much fuel to inject under different operating conditions. A persistent high input can shift fuel trims and throttle response, especially during cold starts or under load.
Common symptoms
These are typical signs that P0113 may be present, though they can vary based on other codes and the engine’s condition.
- Check Engine Light (CEL) illuminated or a stored P0113 code in the scanner
- Rough idle or occasional misfires
- Reduced power or hesitation during acceleration
- Poor or fluctuating fuel economy
- Unusual or erratic engine operation during cold starts
If you notice any of these symptoms, it’s worth investigating the IAT circuit along with related air-fuel sensors to rule out other issues.
Common causes
The following list highlights typical culprits behind a P0113 reading on a Honda. Consider these points when diagnosing the issue.
- Faulty IAT sensor itself
- Damaged, corroded, or loose wiring and connectors in the IAT circuit
- Short to voltage or open circuit in the IAT signal path
- Intake system modifications, aftermarket parts, or air leaks that affect sensor readings
- Power or ground issues to the engine control module (ECM) or a faulty PCM
Proper inspection should cover both the sensor and the wiring harness, as well as any changes made to the intake system that could skew readings.
Diagnosis and repair steps
To address P0113, follow a structured diagnostic approach. The steps below are a common framework used by technicians, but refer to your specific Honda model’s service manual for exact specs and procedures.
- Verify the code with a reliable scan tool and check for any related codes that might point to the IAT or other air-fuel sensors.
- Inspect the IAT sensor, its connector, and the wiring harness for damage, corrosion, or loose connections. Repair or replace as needed.
- Test the IAT sensor resistance at a few known temperatures (as specified by the Honda service manual) to determine if the sensor is within spec. Compare readings to the manufacturer’s resistance vs. temperature table.
- Check for intake leaks or unmetered air that could cause the ECU to misinterpret temperatures and fuel trim, and repair any leaks found.
- If the sensor and wiring test good, consider testing the ECM/PCM power and ground circuits to rule out underlying electrical faults that could produce erroneous readings.
- Replace the IAT sensor if it tests out of spec or shows signs of damage, and recheck the system after clearing codes.
- Clear the codes and perform a road test or drive cycle while monitoring the IAT readings and fuel trim data to confirm the fault is resolved.
Diagnosing P0113 can be straightforward when the sensor and wiring are at fault, but deeper electrical issues or an intermittent PCM fault may require professional diagnostic resources or dealership-level tooling.
Summary
P0113 on a Honda signals a high input from the Intake Air Temperature (IAT) sensor circuit. The issue is most commonly caused by a faulty sensor, damaged wiring, or a disrupted circuit. Addressing it typically involves inspecting and testing the IAT sensor and its wiring, repairing any damage or leaks in the intake system, and replacing components as needed. If you’re not comfortable performing electrical diagnostics or sensor testing, seek a qualified technician for a precise diagnosis and repair.
For owners, timely attention to P0113 can prevent unnecessary fuel economy losses and potential emissions issues. Always start with a careful inspection of the IAT sensor and its harness, then verify readings with the vehicle’s service data and guidelines specific to your Honda model year.