When the 2023 Ram 1500 sets P0113, the IAT sensor is sending higher voltage than expected. This indicates low resistance, interpreted as extremely high air temperature. The ECU responds by reducing fuel delivery, potentially causing lean running and performance issues.
Understanding P0113
P0113 indicates IAT circuit voltage exceeds normal thresholds. The IAT thermistor has low resistance when hot and high resistance when cold. If voltage is abnormally high (low resistance), the ECU thinks air is extremely hot, causing it to lean out the mixture.
Ram 1500 Engine Considerations
The 2023 Ram 1500 offers the 3.6L Pentastar V6, 5.7L Hemi V8, or 3.0L EcoDiesel. Gasoline engines use IAT for fuel calculations, while the diesel uses similar sensors for different purposes. High IAT readings cause gasoline engines to reduce fuel delivery.
Common Causes of High IAT Signal
A shorted sensor or circuit causes low resistance, resulting in high voltage. If the signal wire contacts ground or the sensor element fails shorted, readings indicate extreme heat.
A failed IAT sensor with internal short outputs high voltage regardless of actual temperature. The thermistor element can fail in a shorted state.
Water intrusion in the connector can create a short between terminals, causing high voltage readings. Inspect for moisture and corrosion.
Diagnostic Approach
Monitor IAT readings—if showing extremely high temperatures (200°F+) on a cold engine, suspect a short. Disconnect the IAT sensor and check if the code changes to P0112 (low/open circuit). If so, the sensor is shorted. Check for shorts in the wiring harness between the sensor and ECU.