P0113 IAT Sensor 1 Circuit High Input

DTC P0113 - OBD-II Data Sheet

• High signal level in the intake air temperature sensor circuit 1
• P0113 - IAT Sensor 1 Circuit High Input

What does code P0113 mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles. Although general, specific repair steps may differ depending on the brand / model.

The powertrain control module (PCM) monitors the temperature of the air entering the engine. The PCM supplies a 5 volt reference voltage to the intake air temperature (IAT) sensor.

IAT is a thermistor whose resistance changes with temperature. As the temperature rises, the resistance decreases. Low temperature leads to high signal voltage. When the PCM sees a signal voltage above 5 volts, it sets this P0113 check engine light code.

Possible symptoms

Most likely, there will be no other symptoms other than turning on the malfunction indicator lamp (MIL - Check Engine Light / Service Engine Soon).

Among the most obvious symptoms that signal this error are:

• Engine light stays on
• Difficulty starting the engine
• Engine could run smoother

Causes of the P0113 code

The IAT sensor, located in the air filter housing of all internal combustion engines, is designed to measure intake air temperature in order to calculate the most appropriate amount of fuel to start the engine. When this sensor registers a value that no longer matches the standard values ​​set for the vehicle, DTC P0113 will automatically set. Among the most common reasons why we can trace this code, we can certainly mention:

• Internal IAT sensor failure
• Faulty connection at the IAT sensor
• Open in IAT ground or signal circuit
• Short to voltage in the IAT signal circuit or reference circuit
• IAT harness and / or wiring routed too close to high voltage wiring (e.g. generator, spark plug cables, etc.)
• Faulty PCM (less likely, but not impossible)

Possible solutions

First, if you have access to a scan tool, is there an IAT reading? If the IAT readings are logical, the problem is most likely intermittent. If the reading is less than -30 degrees, disconnect the connector. Install a jumper wire between the signal circuits of the harness connector and the ground circuits. The scan tool IAT temperature reading should be as high as possible. For example, it should be 280 degrees Fahrenheit or higher. If so, then there is nothing wrong with the wiring, and it may have been a connection. If not, install a jumper wire between the IAT signal circuit and chassis ground.

If the scan tool IAT reading has now reached the maximum, test for an open in the IAT ground circuit. If you do not get any reading on the scan tool, it is likely that the sensor signal is open or there is no 5V reference. Check with a DVOM (digital volt ohm meter) the 5 volt reference. If it is there, disconnect the connector on the PCM and check for continuity on the IAT signal between the PCM connector and the IAT connector.

Other IAT sensor and circuit DTCs: P0095, P0096, P0097, P0098, P0099, P0110, P0111, P0112, P0114, P0127

Related DTC discussions

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• Repair Tips

  With a certain margin of safety, it can be argued that this code appears when a malfunction occurs in the wiring or power system, due to a short circuit. However, for proper diagnosis, it is advisable to contact a good workshop, where the mechanic will do the following:

  • Scan the ECM for received codes to view the conditions present when the code was set.
  • Check wiring and connection between sensor and connector. If the sensor is disconnected, most likely the short will be in the connector or wiring.

  Among the most common mistakes that are made when this error code appears, one can remember not immediately carrying out a visual check of the wiring and various connections. Repairing or possibly replacing the IAT connector or wiring harness can often solve the problem signaled by DTC P0113.

  Also be aware that DTC P0113 can cause the engine ECU to go into a "fail safe" mode, which can cause problems with the vehicle's conduction while driving. The reason why this error code should by no means be underestimated. Continuing to drive a vehicle with this code can cause the rings and valves of the engine to malfunction: a situation that must be absolutely avoided in order not to face more serious damage. Finally, keep in mind that the P0113 error code often appears in conjunction with other codes such as P0111, P0112, and P0114.

  Due to the complexity of the verification operations and the special tools required, the problems associated with the error code P0113, unfortunately, cannot be solved alone in the home garage, but must be entrusted to the experienced hands of a mechanic. A visual check of the wiring is perhaps the only operation that you can perform on your own.

  It is difficult to estimate the upcoming costs, since a lot depends on the results of the diagnostics carried out by the mechanic. Typically, an intake air temperature sensor costs around 40 euros (the price obviously varies depending on the model), to which labor costs must be added.

  Frequently Asked Questions (FAQ)

  What does code P0113 mean?

  DTC P0113 indicates a problem with the intake air temperature detected by the temperature sensor (IAT) located in the filter housing.

  What causes the P0113 code?

  The reasons for the appearance of this error code most often lie in a wiring fault or in a malfunction of the aforementioned sensor.

  How to fix code P0113?

  Using the necessary tools, proceed to check the wiring and sensor.

  Can code P0113 go away on its own?

  Usually the code P0113 does not go away on its own.

  Can I drive with code P0113?

  Driving a vehicle with this code can cause problems with the rings and valves of the engine: a situation that must be completely avoided in order not to face more serious damage.

  How much does it cost to fix code P0113?

  Typically, an intake air temperature sensor costs around 40 euros (the price obviously varies depending on the model), to which labor costs must be added.

Intake Air Temperature Sensor P0111 / P0112 / P0113 | How to Test and Replace

Need more help with your p0113 code?

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