P0112 Code - Intake Air Temperature Circuit Low Input

What Does P0112 Mean?

The IAT sensor's job is to sense and report the temperature of the air entering the engine. Why does the fuel injection computer need to know this temperature? This is because the warmer the air, the less fuel the PCM (Powertrain Control Module = Fuel Injection Computer) needs to inject into the cylinders.
So, when a code P0112 lights up the check engine light (CEL), the PCM is letting you know that there's a malfunction in the temperature value that the intake air temperature sensor (IAT) is reporting to the PCM.
Specifically, that the IAT sensor is reporting that the temperature of the air entering the engine is around 300 °F (148 °C). Yeah, that's pretty hot!!

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codigo P0112	codigo falla P0112	P0112 kody błędów	codigo de falla P0112

What are the common causes of P0112 ?

Depending on year, make, and model, DTC P0112 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 or P0111.
• 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 P0112 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 P0112 ?

Like the all engines, the car engine system employs specially developed hydraulic lifters (known as switching roller followers) for the P0112 code intake and exhaust valves. The lifters can be collapsed by disengaging an internal locking pin. The locking pin is disengaged using solenoids to alter oil pressure fed into the lifter.



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