Troubleshooting: Car Shakes When Put in Gear (Automatic Transmission)
If your car shakes when you put it in gear, it can be a frustrating and concerning issue. This problem could be caused by several factors, ranging from minor to more serious. In this article, we will delve into the potential causes of this issue and provide you with a step-by-step guide to diagnose and resolve the problem.
1. Low Transmission Fluid Levels
One of the most common causes of a car shaking when put in gear is low transmission fluid levels. Transmission fluid is responsible for lubricating and cooling the transmission components, and insufficient fluid levels can lead to friction and overheating. This, in turn, can cause the transmission to shudder or shake.
How to Check Transmission Fluid Levels:
- Park your car on a level surface and engage the parking brake.
- Locate the transmission dipstick, which is usually near the engine.
- Pull out the dipstick and wipe it clean with a rag.
- Reinsert the dipstick fully and pull it out again.
- Check the fluid level on the dipstick. It should be between the “MIN” and “MAX” marks.
If the transmission fluid level is low, add the recommended type of fluid as indicated in your owner’s manual. Avoid overfilling, as this can also cause problems.
2. Dirty or Contaminated Transmission Fluid
Over time, transmission fluid can become dirty or contaminated with metal shavings, debris, and other impurities. This can affect the fluid’s ability to lubricate and cool the transmission components effectively, leading to the shaking issue.
How to Change Transmission Fluid:
- Gather the necessary tools and materials, including new transmission fluid, a drain pan, and a wrench.
- Locate the transmission drain plug and oil pan.
- Place the drain pan under the drain plug and loosen it using the wrench.
- Allow the old fluid to drain completely.
- Replace the drain plug and tighten it securely.
- Add the new transmission fluid through the dipstick tube.
- Check the fluid level as described earlier.
It is recommended to consult your owner’s manual for the specific instructions on changing the transmission fluid in your vehicle.
3. Faulty Torque Converter
The torque converter is a fluid coupling that connects the engine to the transmission. It helps to smooth out the transition between gear changes and reduces engine load. A faulty torque converter can cause the car to shake when put in gear.
Diagnosing a faulty torque converter requires specialized tools and expertise, and it is best left to a qualified mechanic. If you suspect this may be the issue, it is advisable to seek professional assistance.
4. Worn or Damaged Motor Mounts
Motor mounts are designed to isolate vibration from the engine and transmission from the rest of the car. Worn or damaged motor mounts can allow excessive vibration to be transmitted to the vehicle, causing it to shake when put in gear.
How to Check Motor Mounts:
- Open the hood and locate the motor mounts.
- Use a pry bar or lever to gently apply pressure to the engine in different directions.
- Observe if there is any excessive movement or play in the motor mounts.
If you notice any significant movement or damage to the motor mounts, it is recommended to replace them as soon as possible. This should resolve the shaking issue.
5. Faulty Transmission Pump
The transmission pump is responsible for circulating the transmission fluid throughout the system. A faulty transmission pump can lead to insufficient fluid pressure, which can cause the transmission to shudder or shake.
Diagnosing a faulty transmission pump requires specialized equipment and should be performed by a qualified mechanic. If the transmission pump is found to be defective, it will need to be replaced.
6. Computer or Sensor Issues
Modern automatic transmissions are controlled by a computer and various sensors. Issues with these components can affect the transmission’s operation, leading to shaking or shuddering when put in gear.
Diagnosing computer or sensor issues requires specialized diagnostic tools and software. It is recommended to take the vehicle to a qualified mechanic who can accurately identify the problem and make necessary repairs or adjustments.
Conclusion
If your car shakes when you put it in gear, it is important to address the issue promptly to prevent further damage to the transmission or other components. While some causes may be minor and easy to resolve, such as low transmission fluid levels, others may require professional diagnosis and repair. By following the steps outlined in this article and seeking assistance from a qualified mechanic when necessary, you can efficiently troubleshoot and resolve the problem, ensuring a smooth and comfortable driving experience.
