P0112 Code – Intake Air Temperature Sensor Low Input

The P0112 diagnostic trouble code (DTC) indicates that the Engine Control Unit (ECU) has detected a low voltage signal from the Intake Air Temperature (IAT) sensor circuit. The IAT sensor measures the temperature of the air entering the engine. This information helps the ECU determine the proper fuel injection amount and ignition timing. When the sensor sends a signal lower than expected, the ECU stores the P0112 code and usually triggers the Check Engine Light. Why the IAT Sensor Is Important The Intake Air Temperature sensor helps the engine control system adjust combustion parameters. It helps calculate: air density fuel injection timing ignition timing adjustments emission control Incorrect readings may cause the engine to run too rich, increasing fuel consumption and emissions. Common Causes of the P0112 Code Several issues may cause this fault. Faulty IAT sensor A damaged or worn sensor may send incorrect low-voltage signals. Short circuit in wiring A short to ground in the sensor wiring can produce a low input signal. Corroded connectors Poor electrical contact may affect signal transmission. Dirty air intake system Contamination around the sensor may affect its operation. Faulty ECU (rare) In rare cases, the ECU may incorrectly interpret the signal. Symptoms of the P0112 Code Drivers may experience the following symptoms: Check Engine Light rough engine idle poor acceleration increased fuel consumption reduced engine efficiency Some vehicles may also experience engine hesitation during acceleration. How to Diagnose P0112 Diagnosing this issue requires several steps. Step 1 – Scan the vehicle Confirm the P0112 code using an OBD2 scanner and check for related codes such as: P0110 P0111 P0113 Step 2 – Inspect the IAT sensor Check the sensor location in the intake system and inspect it for damage or contamination. Step 3 – Inspect wiring and connectors Look for damaged wires, loose connectors or corrosion. Step 4 – Test sensor voltage Using a multimeter, verify that the voltage signal from the sensor is within specification. Repair Solutions for P0112 Common repair solutions include: replacing the intake air temperature sensor repairing damaged wiring cleaning the sensor replacing corroded connectors Most cases are resolved by replacing the IAT sensor. Estimated Repair Cost Typical repair costs include: Repair Estimated Cost IAT sensor replacement $80 – $200 Wiring repair $100 – $250 Connector replacement $50 – $150 Can You Drive With Code P0112 Driving with P0112 is possible for short distances, but it may cause inefficient engine operation. Ignoring the problem may lead to: increased fuel consumption poor engine performance higher emissions Repairing the issue quickly is recommended. FAQ – P0112 Code What does P0112 mean The P0112 code indicates a low voltage signal from the intake air temperature sensor circuit. Can a bad IAT sensor cause P0112 Yes. A faulty IAT sensor is the most common cause. Is P0112 serious It is usually moderately serious, as it affects engine efficiency. How do you fix P0112 Start by checking the IAT sensor and its wiring connections.