P0111 Code - Intake Air Temperature Circuit Range/Performance Problem

What Does P0111 Mean?

OBD-II Code P0111 is defined as a Intake Air Temperature Circuit Circuit Range/Performance Problem

The Intake Air Temperature Sensor measures the rise and fall of the air temperature inside the Intake Manifold. This provides critical data needed for the Powertrain Control Module (PCM) to control the Air Fuel Ratio, the Ignition Spark Timing and many components of the Emission Control Systems.

Code P0111 sets when there is erratic performance in the voltage signal to the PCM from the Intake Air Temperature Sensor Circuit or when the voltage signal goes outside the appropriate range when compared to the values of the Coolant Temperature Sensor.

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codigo P0111	codigo falla P0111	P0111 kody błędów	codigo de falla P0111

What are the common causes of P0111 ?

Depending on year, make, and model, DTC P0111 may have number of causes. Here are some of the most common.

• Defective IAT Sensor – As with all solid-state components, the IAT sensor may cease to function properly, be it due to manufacturing processes or damage.
• Contaminated Sensor – If the IAT sensor is especially dirty, such as due to a poorly-installed air filter or excessive positive crankcase ventilation (PCV) blow-by, the sensor may deteriorate or won’t react as fast to temperature changes. This type of failure would likely be accompanied by DTC P0110.
• Improper Installation – The IAT sensor needs to be in the full flow of air into the engine intake. If the sensor is touching a metal surface, such as IAT sensors installed in the intake manifold, it could ruin the sensor or throw off its reaction to temperature changes.
• Stored Vehicles – Stored vehicles are particularly susceptible to rodent damage. In building their nests and making room for runways, rodents may gnaw through wires, among other things, interrupting circuits critical to your engine’s operation.
• Diagnosing DTC P0111 is not a particularly difficult task. The sensor itself is simple in operation, which makes its analysis easy. On the other hand, if you have to trace an open or short circuit in the wiring harness, this will take time and patience. Depending on year, make, and model, the IAT may be reasonably priced, less than $100 in many cases, but if it is part of the MAF sensor, this will increase the price significantly. Have a professional double check your work before you condemn the MAF/IAT. Similarly, if you have done all your checks and suspect the ECU may be at fault, have your work double checked by a professional, before you condemn an expensive ECU.

How do you troubleshoot P0111 ?

• Repairing or replacing the IAT connector
• Repairing or replacing the wiring as necessary
• Repositioning the sensor back into the air filter housing or intake air tube
• Replacing the IAT with a new sensor

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