P0113 on the 6.7L Cummins is an intake air temperature (IAT) sensor code. It means the ECM sees an abnormally high or out-of-range signal from the IAT sensor. The fix is usually straightforward, but a bad reading can affect fueling and starting, so it is worth resolving.
What P0113 means
P0113 is defined as Intake Air Temperature Sensor 1 Circuit High. The IAT sensor is a thermistor whose resistance changes with air temperature. A high circuit voltage corresponds to a very cold reading or an open circuit. When the ECM sees this out-of-range high signal, it sets P0113. On the 6.7L Cummins the sensor may be a standalone unit or combined with another intake sensor.
Common causes
- Faulty IAT sensor
- Open or high-resistance wiring in the IAT circuit
- Corroded or disconnected IAT connector
- Damaged connector pins or a broken sensor terminal
- Signal wire chafed and broken against a bracket
Symptoms
- Check engine light with stored P0113
- Possible hard start when cold
- Rough running or slightly off fueling in some conditions
- Minor drop in fuel economy
- Often few drivability symptoms beyond the light
How to diagnose it
Read live IAT data; a P0113 typically shows an implausibly cold reading regardless of actual temperature. Inspect the sensor connector for corrosion, backed-out pins, or a loose fit. Check the wiring for opens and high resistance, and confirm the sensor's ground and signal circuits are intact. Measure the sensor's resistance and compare it to a temperature-versus-resistance chart. If the wiring is good but the sensor reads open, the sensor is faulty.
How to fix it
Replace the IAT sensor if it tests open or out of range. Repair open or high-resistance wiring and clean or replace a corroded connector. Make sure the terminal pins seat correctly. After the repair, clear the code and confirm the IAT reading tracks ambient temperature accurately, then verify the code does not return after a drive cycle.
Frequently asked questions
Is P0113 an easy fix?
Often yes. It is usually a faulty sensor or a wiring/connector fault, both of which are relatively simple and inexpensive to address.
Will P0113 hurt my engine?
It rarely causes serious harm, but a wrong intake temperature can affect fueling and cold starts, so repair it to keep the engine running correctly.
Can a loose connector cause P0113?
Yes. A corroded or partially disconnected IAT connector can open the circuit and produce the high-signal reading that sets the code.
Need parts or a second opinion? The team at Core Diesel Parts can help you match the right components to your engine. Email sales@coredieselparts.com with your VIN and symptoms and we will point you to the correct parts.
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