Slipping can also be combined with sudden shifting, RPM spikes and grinding noises. All of these indicate that there is a problem and vital friction materials are unable to engage. If left to continue, significant transmission damage could occur. 2. Overheated Transmission

A healthy ATF should appear almost clear and have a slightly sweet smell. If you apply a single drop to a paper towel, it should spread out to around a 3cm width, with no discolouring or spots. Symptoms of poorly operating transmission fluidToyota WS (World Spec): They are characterized by their low viscosity. They were developed for automatic Toyota cars. If the fluid is low but looks good, you can top it off. However, you will want to figure out what is happening to the fluid, because it shouldn’t be leaking. Whenever shifting doesn’t occur as it should, it could be related to low fluid. Irregularities can present themselves as a slamming sensation or a delay.

If you're not sure, transmission fluids on lists number 236.12 or 236.14 are safe choices for most 5-speed and 7-speed transmissions. (Fluid 236.11 is for cars which have the ZF transmissions): You don't have to buy the Mercedes own-brand fluid from the main dealer. If you look at the 236.12 and 236.14 lists that I pointed to, so you can see for yourselves that it's MB's recommendation not mine, you'll find that MB did test and approve MANY fluids from lots of manufacturers.Pull the air ducts that connect to the engine cover. Grab the engine cover on both sides and pull it straight up. It is held in place with 4 clips. Transmissions, or gearboxes, can be manual or automatic. The type of fluid or oil each requires is unique, as they perform related, yet quite different tasks. Heat resistance and thermal stability to help prevent deposit and sludge from forming due to high temperatures You can try and fill the transmission with transmission fluid to see if that resolves the situation. However, driving the car without the right amount of fluid in the first place might have caused irreversible transmission damage. 6. Dashboard Warning Lights This problem could also occur with a loss of power and erratic shifting. Either way, you must pull the car over and stop driving before further damage occurs. Otherwise, you are going to need a new transmission. 3. Delayed Gear Engagement

Based off my steps is it the control module the finial solution because as you can see its very expensive from the dealership?

API GL standards

I took the car to the Mercedes dealer twice. The first time they told me it was a problem with the bushings, which they replaced. The problem continued to happen. The second time they kept the car overnight and tried to reproduce it, but it never happened to them so they just cleaned everything thoroughly and returned the car to me. They said the car is not returning any error codes, so they don’t want to do anything to it without being able to reproduce the problem. Automatic transmission fluid is much thinner than gearbox oil, and because of the dye it contains, is usually red or green. We have a wide variety of products from top brands including high quality Wynn oil and Comma oil , alongside our leading range of own-branded gearbox lubricants. Use our gearbox oil selector tool to find the right oil for you. Changing your gearbox oil is part of a routine maintenance schedule, but if you notice a leak or swap your gearbox over, it’s crucial to replace the fluid (and fix the leak!).

Highly Friction Modified ATF: This fluid is mainly recommended for Honda, Acura, Toyota, Jeep, Lexus, and Saturn cars with automatic transmission. You can safely use any oil/fluid on the numbered list for your particular transmission because they have all been tested and approved by Mercedes. Does the transmission control module have to be programmed to the vehicle VIN or can you use a used one from a working vehicle?However, MBUSA has changed the “sealed for life” recommendation gradually by adding more frequent service in later model years.