Car is full of transmission fluid and still won’t move

Possible causes

Low transmission fluid pressure. This can be caused by a leak in the transmission, a faulty transmission pump, or a clogged transmission filter.
Damaged transmission gears. This can be caused by a lack of lubrication, excessive wear and tear, or impact damage.
Faulty transmission control module (TCM). This is the computer that controls the transmission’s operation. A faulty TCM can prevent the transmission from shifting gears properly.
Other mechanical problems. These can include problems with the driveshaft, axles, or differential.

Troubleshooting

To troubleshoot the problem, you will need to:

Check the transmission fluid level. The transmission fluid level should be between the “full” and “add” marks on the dipstick. If the fluid level is low, add fluid until it reaches the correct level.
Inspect the transmission for leaks. Look for any leaks in the transmission pan, lines, or fittings. If you find a leak, repair it as soon as possible.
Replace the transmission filter. A clogged transmission filter can restrict fluid flow and cause transmission problems. Replacing the filter is a relatively simple and inexpensive repair.
Have the transmission inspected by a mechanic. If you are unable to find and fix the problem yourself, you should have the transmission inspected by a mechanic. The mechanic will be able to diagnose the problem and recommend the necessary repairs.

Repair costs

The cost of repairing a transmission problem will vary depending on the severity of the problem. A simple repair, such as replacing the transmission filter, may only cost a few hundred dollars. However, a more complex repair, such as replacing the transmission gears, could cost several thousand dollars.

Prevention

To prevent transmission problems, you should:

Check the transmission fluid level regularly. The transmission fluid level should be checked every 6 months or 12,000 miles.
Change the transmission fluid and filter according to the manufacturer’s recommended schedule. The transmission fluid and filter should be changed every 30,000 to 60,000 miles.
Avoid towing heavy loads or driving in hilly areas if possible. Towing heavy loads or driving in hilly areas can put a lot of stress on the transmission.
If you experience any transmission problems, have them inspected by a mechanic as soon as possible. Early diagnosis and repair can help prevent more serious problems.