SMG transmission cannot be put into gear, fluid leaks

My car has an SMG transmission. The problems started occuring a couple of months ago so I went to the delership. They found and fixed a leak. Also, they added the SMG transmission fluid. After this was done, I noticed that there is a large amount of fluid leaked under the car. I tried to run the car, but I cannot put it into gear. What could be wrong here? Did they do a bad job or are the issues happening again?
Experienced mechanics share their insights in answering this question :
Hello. It sounds to me like the problem was either misdiagnosed or improperly repaired. If the problem was misdiagnosed, the issue would still be occurring because it was never addressed in the first place. If the problem was improperly repaired, the issue may have been attempted to be resolved but the technician may not have done every step correctly.

Either way, my recommendation would be to take your vehicle back to the shop that performed the repair and ask them to reassess the issue. If the problem was misdiagnosed, you should be able to get your money back. If the problem was improperly repaired, the issue you are having should be under warranty and the issue should be repaired free of charge. If you would rather not have this done by the same mechanic, a certified technician from YourMechanic can come to your car’s location to inspect the gear shifting issue in order to have this resolved.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reason your BMW won`t shift gear is that the transmission fluid level is lower than recommended. Even if you add transmission fluid regularly, the low fluid level could be caused by a leak.
There could be a bad connection or a hole/crack in one of the transmission lines that is causing the leak. The transmission system has valves and solenoids that keep the flow of the fluid controlled when the vehicle is running. A damaged part or faulty valve/solenoid can result in a transmission fluid leak.
When it comes to leakage, the only real solution is to take down the machine and repair it in order to stop the leak. As oil continues to flow from the gearbox, there are obvious safety concerns involved with exposing people and the environment to the gear oil.
A healthy transmission will shift between gears smoothly and there won`t be any slippage. Low fluid levels can cause gears to miss, which will result in a grinding sensation.
Transmission won`t engage or stay in gear

If when you put your vehicle into gear and it won`t move, this may be a problem with low transmission fluid due to a leak, the shifter, shifter cable, or it could even be a problem in the valve body of your automatic transmission.

The main reason the car won`t go into gear is that the level of transmission fluid in the vehicle is lower than required. If the level is low despite regular maintenance, there may be a leak. Transmission fluid, therefore, is important to ensure that the car`s moving parts are properly lubricated for functioning.
Although there are multiple places on a vehicle where transmission fluid can leak, the 3 most common include: Pan gasket. Cooler lines. Output, tail, or torque converter seal.
The metal parts inside the gearbox will always be susceptible to rusting and varnish when water is present. When you add a slight amount of heat, air and water together, you will have oxidation, acid numbers will rise and rust will start forming, causing a plethora of other problems.
If your transmission starts to slip, face trouble shifting gears, hear strange noises, overheats or there is fluid leaks, then it may be due to low transmission fluid.
But a blown fuse No. 38 becomes a likely candidate causing a loss of power to the transmission solenoids.
This issue may be caused by a couple of different things. A gasket near the transmission filter where it mounts to the valve body could be leaking causing the hydraulics within the transmission not to engage second gear properly. On the other hand, a shift solenoid may also be at fault.
One main reason why the automatic transmission in your car may not be shifting smoothly is the ECM is going bad. It is best to get this checked out by an experienced auto mechanic technician who understands the electrical system. Other indicators include bad connections within, or worn out sensors and faulty solenoids.
Hard, and sometimes impossible shifting into first and reverse is caused by the clutch disc not moving away from the spinning flywheel. This is commonly referred to as the “clutch is not releasing”. The number one cause is the hydraulic system that operates the clutch is leaking and has low fluid.
The torque converter pushes the transmission oil throughout the transmission. It`s basically a pump, and if this pump develops a crack, you`ll end up with a transmission leak. The needle bearings inside the torque converter can also get damaged and this, too, will cause a transmission fluid leak under your car.
When the torque converter starts malfunctioning, you may feel shuddering and even slipping in overdrive. You usually notice your car shuddering because it feels like it`s vibrating. Your car will vibrate even when you`re not going very fast. The shuddering makes the car lag and is very noticeable.
A puddle on the ground: The most obvious sign of a transmission leak is discovering a pool of transmission fluid under your vehicle. Most leaks start small, so check your regular parking spot often. A few drops aren`t necessarily a major problem, but it will be the sign that you have the start of a leak.
While it is not especially dangerous to continue driving with a leaking transmission fluid, it can cause catastrophic damage to your engine. As soon as you notice your car is leaking transmission fluid, you should seek to contact a certified mechanic to have your transmission fluid serviced.
In short, if the cost to replace the gearbox isn`t too hefty, and the car is in reasonable condition and age, it`s probably worth fixing your gearbox.
To be sure, you`ll need to pinpoint where it`s coming from using your eyes and your nose. Amber, dark brown or even black fluid is probably motor oil, but it could also be brake fluid. Reddish fluid is usually from the transmission, though it could also be power-steering fluid.
Once water gets into the transmission enough to affect operation, a rebuild is required. It doesn`t take much–less than an ounce of water can cause problems.
Transmission Damage

When driving your car through a flash flood, water can easily flow over the transmission and into the vent. Once water gets in, it dissolves the transmission`s linings and the lubricant begins to fail, resulting in total failure of the transmission.

Driving your car through a low transmission fluid level is dangerous to you and the vehicle. Failure to top up the fluid is a hazard that might cause extreme damage to the transmission, the engine, and essential components that keep the car running.
Excessive fluid prohibits proper lubrication and cooling and slows the rotating crankshaft, similar to the effect of running through water. When the air above mixes with the high levels of fluid, it creates a foamy substance that saturates the transmission. This can lead to: Part pitting.
How long can a car run without transmission fluid is up to about 10 miles on low to no transmission fluid, but doing so would be extremely risky. Transmission fluid is essential for helping your car shift gears smoothly. Without it, gears are exposed to added friction and may not be able to move at all.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

SMG transmission cannot be put into gear, fluid leaks
ANSWER : Hello. It sounds to me like the problem was either misdiagnosed or improperly repaired. If the problem was misdiagnosed, the issue would still be occurring because it was never addressed in the first place. If the problem was improperly repaired, the issue may have been attempted to be resolved but the technician may not have done every step correctly.

Either way, my recommendation would be to take your vehicle back to the shop that performed the repair and ask them to reassess the issue. If the problem was misdiagnosed, you should be able to get your money back. If the problem was improperly repaired, the issue you are having should be under warranty and the issue should be repaired free of charge. If you would rather not have this done by the same mechanic, a certified technician from YourMechanic can come to your car’s location to inspect the gear shifting issue in order to have this resolved.

There is automatic transmission fluid in a manual transmission. Is it okay to leave or do I need manual transmission fluid?
ANSWER : This would depend on what the manufacturer recommends. Many manual transmissions do take automatic transmission fluid. If your transmission has ATF in it, it is very likely that it is supposed to have that in there. If not, it is likely that the transmission would not function properly with the wrong fluid. Many manual transmissions will also take engine oil as a lubricant. The best way to know for sure is to check your owner’s manual or call your local General Motors dealership to inquire.

Everytime I put car into gear it shuts off the car but idles fine
ANSWER : This sounds like a faulty speed sensor problem. Most cars have two speed sensors (one monitors input shaft and one monitors output shaft) which tell the computer what the gear ratio is of the transmission while in use. If either of these are not working properly, they will cause the computer to shut the car off for safety reasons. I would suggest having an expert from YourMechanic come to your home to diagnose your stalling issuee and help you repair it.

My car is leaking transmission fluid – I can’t diagnose the leak
ANSWER : Based on the NHTSA database covering consumer complaints, as well as government mandated recalls and factory service bulletins, for your specific year, make and model, I do not see evidence of widespread complaints about transmission fluid leaks. Such leaks are, in fact, common in transmissions made by any car company, particularly if the transmission is older than say 10 years. There is a manual shaft seal, oil pan gasket, output shaft seals, case seals, torque converter seal (inaccessible) and so forth all of which are potential leak points on your transmission.

If you want to identify and resolve these leaks, certainly a certified Mechanic from YourMechanic could come out and perform a transmission leak inspection and let you know where the leak points are and what it will cost to resolve them.

I went to get an oil change, and the mechanic noticed a leak in my transmission. This was on Saturday. They put more fluid in it.
ANSWER : There could be a leak on the input shaft, output shaft, oil pan, dipstick grommet, or the seal on the shifter linkage could be leaking. I recommend seeking out a professional, such as one from Your Mechanic, to help you diagnose the leak on your transmission.

1998 mercedes benz c280 transmission fluid leak from top
ANSWER : Hi there. Unfortunately, we are not able to receive pictures or video to pinpoint damage or identify parts for vehicles through this platform. The best way to identify this item is to search online for a detailed schematic of your C280 Mercedes-Benz or contact a local MB specialist mechanic or the dealership service department to determine the parts name and function. You might also want to have a MB specialist mechanic install and inspect your vehicle for further transmission fluid leaks to ensure the repairs are correctly completed.

Have no reverse and a transmission fluid leak
ANSWER : I would recommend having your transmission inspected by a certified transmission expert to determine the exact cause of this issue. It is very possible that some internal damage has occured to the transmission from the loss of fluid. It is a possibility that the transmission will need to be removed from the vehicle and taken apart to fix this issue so be sure to have this repair done professionally to avoid any further issues with the transmission.

Transmission fluid leaked while pulling a car out of mud
ANSWER : From the description you’re giving me, I’m not sure. I know many Fords, including my F150, have a circular seal type bell housing inspection cover near the transmission. Fluid pooled in this area generally indicates an engine oil leak from the rear main seal or a transmission leak from the front pump seal. The only way to know for sure is to have your truck’s transmission leak inspected firsthand by a professional. The team at YourMechanic is an excellent option since we make house calls.