🔧 P112D BUICK Code: Causes, Symptoms, and Solutions
📌 Definition of P112D BUICK Code
The error code P112D indicates a problem with the Intake Air Temperature Sensor (IAT). The PCM (Powertrain Control Module) detects that the IAT sensor value is outside the manufacturer’s specified range.
🚨 Possible Symptoms
- 🔥 Engine light on (Check Engine)
- 🚗 Unstable idle or engine stalling
- ⛽ Poor fuel consumption
- 🌡️ Reduced engine performance
⚠️ Possible Causes of P112D Code
🔍 Main causes include:
- Faulty Intake Air Temperature Sensor (IAT)
- Damaged IAT sensor wiring harness (shorted or open)
- Poor electrical connection in the IAT sensor circuit
🛠️ How to Fix P112D BUICK Code?
1️⃣ Visually inspect the wiring harness
🔎 Check the IAT sensor connectors and wires.
✅ Look for broken, melted, corroded, or disconnected wires.
2️⃣ Test the air temperature sensor with a multimeter
🔧 Measure the IAT sensor resistance at different temperatures:
- At 20°C, resistance should be around 2,500 Ω.
- At 50°C, it should drop to approximately 700 Ω.
3️⃣ Scan for codes with an OBD-II tool
📊 Use an OBD-II scanner to check for other error codes.
4️⃣ Clear codes and test the vehicle
🚗 If the problem persists after repairs, replace the IAT sensor.
📌 Conclusion
The P112D BUICK code is usually caused by a faulty IAT sensor or an electrical connection issue. Checking the wiring harness, performing a resistance test, and using an OBD-II scan will help diagnose and resolve the problem.