* Low Transmission Fluid: Low fluid level can cause a variety of problems, including the inability to shift into park. Check your transmission fluid level immediately. If it's low, you'll need to add fluid (the correct type is crucial!), but low fluid is a symptom of a bigger problem that needs addressing.
* Transmission Linkage Problems: The linkage that connects the shifter to the transmission can be worn, bent, or broken. This prevents the shift lever from properly engaging the park pawl. This often manifests as difficulty shifting into *all* gears, not just park.
* Park Pawl Problem: The park pawl is a mechanical device inside the transmission that locks the output shaft. It can be worn, broken, or malfunctioning. This is a more serious internal problem.
* Shift Cable Adjustment: If your transmission uses cables instead of a linkage, the cables might need adjustment. They could be stretched or improperly routed.
* Internal Transmission Problems: More serious internal transmission issues, such as low internal fluid pressure, worn components, or damage to the valve body, can prevent it from shifting into park.
* Binding in the Shift Mechanism: Something might be interfering with the shift mechanism itself – debris, a damaged part within the mechanism, etc.
* Broken Shift Lever: Though less common, it's possible the shift lever itself is broken or damaged.
What to do:
1. Check the transmission fluid level: This is the easiest and first thing to check. If it's low, add the correct type of fluid (consult your owner's manual). However, do not drive the car until you've identified the reason for the low fluid. Low fluid indicates a leak or a more serious internal issue.
2. Inspect the linkage (if applicable): Look for any bent, broken, or loose parts in the linkage connecting the shifter to the transmission.
3. Try rocking the car slightly: Sometimes, gently rocking the car back and forth can help free up the mechanism. Only do this if the emergency brake is firmly engaged.
4. Engage the parking brake: Make absolutely sure your parking brake is firmly engaged *before* attempting any of these steps. This is critical for safety.
5. Consult a mechanic: If you're not comfortable inspecting the linkage or transmission fluid yourself, or if none of the above solves the problem, take your car to a qualified mechanic for diagnosis and repair. A faulty park mechanism is a serious safety concern and should be addressed immediately. Leaving your car in neutral or gear without a proper park lock could result in it rolling.
Ignoring a transmission that won't go into park is unsafe. Get it checked out as soon as possible.
