1. Idle Air Control (IAC) Valve Issue: The IAC valve is responsible for controlling the amount of air that bypasses the throttle plate when the engine is idling. If the IAC valve is faulty or dirty, it may not be able to properly control the airflow, causing the engine to stall when put in park.
2. Throttle Position Sensor (TPS) Issue: The TPS monitors the position of the throttle plate and sends this information to the engine control unit (ECU). If the TPS is faulty and sends incorrect data, it can lead to the engine stalling when put in park.
3. Vacuum Leak: A vacuum leak can cause the engine to run lean (insufficient fuel compared to air), which can result in stalling, especially at idle or when shifting into park.
4. Fuel System Issues: Problems with the fuel system, such as a clogged fuel filter or faulty fuel pump, can lead to fuel starvation and engine stalling. If the fuel supply to the engine is insufficient when shifted to park, stalling can occur.
5. Transmission Issues: In some cases, a car may stall when put in park due to transmission problems, such as low transmission fluid or a faulty transmission control module.
6. Electrical Issues: Electrical issues, like a loose or faulty electrical connection, damaged wiring, or a malfunctioning ignition switch, can also cause the engine to stall.
If your car is stalling when put in park, it's recommended to have it inspected by a qualified mechanic. They can diagnose the exact cause of the stalling and perform the necessary repairs to resolve the issue.
