* Torque Converter Issues: The torque converter is the fluid coupling between the engine and transmission. If it's failing, it might not be able to handle the load when shifting into drive (which requires the most torque), but it might function adequately in lower gears (reverse and low) where the engine load is less. This is a common culprit in this scenario.
* Transmission Problems: Internal transmission problems, such as worn clutches or bands, can also cause this. The lower gears might still function because they are less stressed than the drive gear.
* Shift Linkage/Solenoid Problems: There could be a problem with the linkage that connects the gear selector to the transmission, or a faulty solenoid that controls the shifting process. This would prevent the transmission from correctly engaging drive.
* Low Transmission Fluid: Check your transmission fluid level. Low fluid can lead to various transmission problems, including this stalling issue. Pay attention to the fluid's color and condition as well; it should be reddish-pink and clear, not brown or burnt smelling.
* Engine Issues (Less Likely): While less likely given the specific symptoms, a problem with the engine's ability to provide sufficient power under load (e.g., a weak fuel pump, clogged fuel filter, or ignition issue) *could* contribute. However, this would likely manifest more broadly than just in drive.
What to do:
1. Check the Transmission Fluid: This is the easiest and cheapest thing to check first. If it's low, add the correct type of transmission fluid (consult your owner's manual). If it's dark or burnt, you likely have a more serious transmission problem.
2. Get a Professional Diagnosis: Given the complexity of transmissions, it's highly recommended to have a qualified mechanic diagnose the problem. They can perform a proper inspection, check fluid pressure, and determine the exact cause. Trying to fix this yourself without the right knowledge and tools could lead to further damage.
3. Avoid Driving it: Continuing to drive the vehicle with this issue could worsen the problem and potentially cause significant transmission damage.
In short, the problem is most likely within the transmission or its connection to the engine, and professional help is needed to pinpoint and fix the issue safely.
