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Code definition P0113
Intake Air Temperature (IAT) Sensor Circuit High Input Problem
What does the code P0113 mean?
P0113 is a generic OBD-II code which indicates that the engine control module (ECM) has registered an IAT sensor output above the expected sensor range.
What causes the code P0113?
If the sensor output voltage is greater than 4.91 volts for 0.5 seconds or more, the ECM determines that the IAT sensor circuit is open circuit and sets to P0113 fault code.
What are the symptoms of the P0113 code?
- The ECM will turn on the check engine light and enter Safe Mode.
- The engine may not start as normal.
- The engine may run at a very low gear.
- The engine may have problems with pre-ignition due to poor combustion.
Note: Symptoms are determined by the manufacturer’s ECM safety strategy for the vehicle during a fault and may vary by manufacturer and vehicle.
How does the mechanic diagnose the P0113 code?
- Scan the ECM, document the received codes, and review the freeze frame data to see the conditions at the time the code was set.
- Erase fault codes from the vehicle and check the vehicle again to see if the code reappears.
- Performs a visual inspection to verify that the sensor harness or connector is not shorted.
- Watch the sensor live data on the scanner while disconnecting the IAT sensor connector to see if the sensor reading reaches -40 ° F, indicating the sensor is short-circuited.
- If the sensor is disconnected and the input is still 240 ° F, the short circuit is in the connector or harness.
- If no problem is observed, the mechanic performs manufacturer specific tests for the code and makes repairs if necessary.
The most common errors when diagnosing the P0113 code
- Failure to visually inspect connections and wiring.
- Failure to follow the manufacturer’s point test procedure step by step and skipping steps.
- Not replacing the IAT sensor only when tests indicate a problem.
- By not connecting a new or known good sensor to the harness and looking at the ECM data to see if the sensor temperature output is as expected.
How serious is the P0113 code?
- Code P0113 will cause the engine ECM to enter fail-safe mode.
- Fail-safe mode, depending on the manufacturer’s fail-safe strategy, may cause underpowered driving symptoms.
- Driving the car with an oil level that is too low for an extended period of time can cause internal problems with the rings and valves of the engine.
What repairs can fix the code P0113?
- Repair or replace the short circuit in the IAT connector.
- Repair or replace the short circuit in the wiring as needed.
- Replace the IAT with a new sensor.
Additional notes regarding code P0113
The P0113 code is often associated with the P0111, P0112, and P0114 codes.
Most of the problems with the intake air temperature sensor for the P0113 code are failures caused by a short circuit of damaged harnesses or an internal short circuit of the sensors to power.