The table below gives you a general idea of the costs for common car makes. ![]() However the exact cost of automatic transmission diagnostic will depend on where you take it. Whilst the average cost of an automatic gearbox repair is around a more costly figure of £550, the average cost of an automatic transmission diagnostic is £224. Automatic transmission diagnostic average costs and prices However, repairing or replacing an automatic transmission is a costly job, so it is better to keep to the schedule of the recommended automatic fluid change intervals. Some manufacturers don’t recommend the change as frequently as they suggest flushing it only every 100,000 miles and others don’t mention transmission flushes at all.Īutomatic transmissions are susceptible to damage over time, and sometimes a car owner will find, no amount of transmission fluid changes can prevent that. Most manufacturers recommend a transmission flush and transmission fluid change every 30,000 miles or every 2 years. It also helps valve operation, brake band friction, torque conversion as well as gear lubrication. So, all in all, it has a very important job of keeping things running smoothly within the transmission system. Its job is to lubricate mechanical parts, maintain fluid pressure, cooling, preventing oxidation, conditioning the gasket, and preventing rust. The drain plug is removed and the oil drained,the plug is then put back in, the filler plug is then removed and filled until oil starts to overflow and then the plug is put back in.When we consider the functions of the transmission system, the transmission fluid is a crucial component of the system's operation. Manual transmissions usually have a drain plug and a filler plug. In both cases, if your oil hasn’t been replaced, it starts to break down and lose all its cooling and protection properties which will eventually lead to internal damageĪutomatic transmissions generally involve draining the oil, removing the transmission pan, replacing the filter (if required) and pan gasket, refilling the transmission initially and then running the transmission through the gears and then rechecking the levels, some manufacturers differ from this process so its best to check with your local workshop. Transmission fluid is as important to your transmission as engine oil is for your engine, in fact, your automatic transmission won't shift properly without the proper oil. Is it important to get your transmission fluid replaced? With manual transmissions the oil is a gold colour but the same principle applies in that the darker the oil the more likely it needs replacing. There are also some manufactures which require little to no servicing throughout the life of the vehicle. In this case, it's better to let someone qualified check it out as it could involve a lengthier process. Some manufactures don’t have dipsticks to limit customers from checking/replacing their own oil. The oil should be reddish in colour and the darker the colour of the oil the more likely it is to need replacing. Most transmission oils get replaced at specified service intervals along with your oil service, but if you're unsure if it has been replaced, most automatic transmissions have dipsticks where you can check the level and condition of the oil. How to tell if you need transmission fluid replaced In manual transmissions, its primary role is lubrication and protection of the internals of the transmission. Transmission fluid types differ depending on the type of transmission, for automatic transmissions it serves as both an oil and a hydraulic fluid that helps facilitate gear changes, it also moderates the temperature and lubricates any moving parts. ![]() ![]() Get quick, obligation-free quotes from multiple local mechanics and choose the one best suited to you. The easiest way to get your transmission fluid replaced is to book it in with a fantastic mechanics on AutoGuru, we take all the hard work out of it and make the whole process as easy as possible.
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