Transmission issues are one of the many things that a car owner dreads. It takes a long time for an engine demonstrating signs of problems to fail catastrophically, but it doesn’t take long for a seemingly minor shift issue to completely cripple a car and leave you stranded. Before that happens, it’s worth looking into how much does a transmission fluid change cost.
Along with the increasingly complex architecture of modern transmissions, transmission reliability is now a top concern for many new car owners. That said, transmission-related problems weren’t always such a major point of consideration for car buyers.
Back a few decades when manual transmissions were prevalent, they were the go-to choice for many as the choice for work vehicles. Even automatic transmissions back then were mostly brake-band units that were durable, to say the least. These transmissions would last thousands of miles mostly trouble-free.
- Purpose of Transmission Fluid
- Signs of Poor Transmission Fluid
- How Much Does A Change Cost?
- DIY Process
- Change VS Flushing
Maybe your automatic transmission would develop slight jerks upon shifting, but nothing especially concerning. Everything was purely mechanical so there wasn’t much that can go wrong. Nowadays though, automatic transmissions are built up of countless intricate electrical parts, something going wrong can end up with you left stranded.
Therefore, it is important that you recognize the signs of a transmission-related issue and consult a workshop when possible. However, before that, there is something that many workshops will recommend you to carry out first – replacing your transmission fluid.
Arguably, within an automatic transmission, the single most important thing is the transmission fluid. Imagine it as the blood flowing through our bodies. Without transmission fluid, or if there’s too much of it, your transmission won’t be able to function normally.
The purpose of the transmission fluid is simple, it’s used as a medium to transfer hydraulic pressure from one end to another. The transmission control unit controls the flow of the transmission fluid using the valve body and the transmission solenoids. A mechanically driven transmission oil pump keeps the oil constantly pressurized.
By changing how the solenoids are activated, the flow of the fluid within the valve body alters to pressurize different sets of clutch packs. With this, different gear sets can be engaged to shift into different gears.
Therefore, from the operation of a gearbox, it can be observed that the condition of a transmission fluid must be optimal for shifts to be carried out smoothly. However, with the design of an automatic transmission, the fluid itself doesn’t need to be changed too often in normal circumstances.
You might think to yourself that no one has really reminded you that the transmission fluid in your car needs changing anytime soon. This is because modern automatic transmission fluid can actually last quite a long time, with design features incorporated within an automatic transmission to prolong the fluid change time.
How Often To Change Transmission Fluid
First of all, there’s an automatic transmission filter within the system. When properly done, this filter should be replaced every time you change out the transmission fluid. Furthermore, an automatic transmission is an enclosed, recirculating system. This means that no foreign dirt particles should be introduced into the fluid.
Therefore, under normal operation, the fluid level shouldn’t change. This means that no topping off is necessary. Most automatic transmissions also implement a fluid cooler to prevent overheating under heavy load. This helps to prevent overheating, which is especially prevalent in offroad vehicles with automatic transmissions.
The other major factor is a bit of a blunder in the automotive industry. A decade or so ago, some manufacturers decided to market their transmission as ‘maintenance-free‘. These automatic transmissions were supposedly included with ‘lifetime transmission fluid‘.
Needless to say, to anyone who understands how transmission fluids to function, it’s impossible for a transmission to be maintenance-free. Transmission fluids go through dozens of heat cycles that eventually break down the constituency which contributes to fluid degradation.
And once the transmission fluid degrades, it stops being efficient at pressurizing and sustaining optimum capability at high temperatures. Thus, the owners that did not replace their transmission fluid experienced premature transmission failures early on in the ownership.
The other big factor for some is the cost to replace automatic transmission fluid. Depending on the vehicle model, transmission fluid changes can cost upwards of ~ $200. Often, the schedule also coincides with a major service, so some owners will opt to stretch the fluid change mileage. This is ill-advised, as ignored fluid changes can contribute to bigger problems later on.
Symptoms Of Dirty Transmission Fluid
Once you have a better understanding of how transmission fluid works and why it needs to be changed regularly, you might question whether your transmission is displaying signs that it needs a fluid change.
1. Poor Shift Quality
A major sign that you need a fluid change is when you start to notice increasingly worse shift quality. First, the transmission might only jerk a bit during upshifts, but it will develop further into rough shifts that buckle the entire car.
In cases where it gets really bad, your transmission might even start slipping in and out of gears. You’ll notice that the car refuses to change gear because the transmission fluid pressure is inadequate. It’s possible that this happens under load, or even when cruising.
If your transmission starts to slip, it will trigger an automatic transmission fault code. In some cars, this will force the transmission into ‘default’ mode, or limp-home mode. In this case, your transmission will be locked into a single gear and a warning light will appear in your instrument cluster.
2. Dirty Transmission Fluid
It’s obvious, but if you have a transmission fluid dipstick, you can always just pull it up to inspect the fluid condition. Using a paper towel, acquire a sample blotch of the fluid. Look for images of worn transmission fluids online. There should be images that you can compare your fluid color to.
In general, if your transmission fluid is a bright color (typically pink, red, blue, or gold), then you’re in good shape. This means that it has just been changed out recently, and it’s in good condition.
However, if it’s murky and dirty, then it’s due for a change. Typically worn transmission fluids darken in color from the heat. If it’s milky in color, this means that coolant has contaminated the transmission fluid and the leak must be rectified as soon as possible.
In some cases, the transmission fluid might be a burnt, almost black color. This means that the transmission fluid has overheated and it must be replaced as soon as possible. Internal damage might have occurred as well in the form of a burnt clutch pack. This can happen due to excessive slippage or just degradation in fluid quality.
How Much Is A Transmission Fluid Change
Of course, owners are sometimes apprehensive about transmission fluid changes due to the higher cost associated with it. You might hope to delay the transmission fluid change interval, but it’s not worth it in the long term. Late fluid changes cause unnecessary wear to the internals of an automatic transmission.
It’s a common mistake for consumers to compare the costs of an oil change to a transmission fluid change and determine they’re being swindled by a dishonest workshop. However, transmission fluid changes are usually more expensive, due to the greater fluid cost and higher labor.
A major contributor to the steep maintenance cost is the fluid used. Depending on the transmission your car is using, you’ll need different transmission fluid that varies wildly in price. And unlike oil changes, it’s not recommended to mix transmission fluids of different manufacturers and standards together. If you’re using Toyota T-IV ATF, you should stick to the T-IV on subsequent changes.
Transmission Fluid Change Cost
You’re expected to spend around $10 per quart of transmission fluid. How much you need is highly dependent on your transmission type. If you have a normal 4-speed transverse, you might only need about 2.5 to 3 qt of transmission fluid. However, if you have a modern 9 or 10-speed longitudinal automatic, you might need upwards of 7 to 8 qt per fluid change.
It’s also advised to replace your transmission filter while changing the fluid, along with the transmission pan seal. The cost for them ranges from $20 to $50 depending on your car model. However, on newer cars, especially luxury cars, it gets complicated.
The transmission fluid pan can be made of plastic, with the fluid filter element built right into the pan itself. This means that the pan needs to be changed together with the filter. Costs of the filter for these cars skyrocket because of this. You can expect to spend over $300 for the filter alone.
Adding labor costs, which are typically around $80 for an independent shop, the total cost sums up to around $150 to $250 per transmission fluid change. That said, if you have a luxury car that requires 10 liters of transmission fluid and a transmission fluid pan, it can be over $700 for a fluid change.
How Often Should You Change Transmission Fluid
While transmission fluid changes cost a lot more than oil changes, you only need infrequent fluid changes to keep your transmission happy. Generally, it’s recommended that you get your transmission fluid changed every 30,000 miles to be safe. That’s approximately every 3rd or 4th oil change.
That said, some manufacturers are claiming that their transmission fluid lasts longer, and only requires inspection every now and then. Fully synthetic transmission fluids such as Toyota WS ATF can last as long as 120,000 miles. GM claims their 10-speed transmission fluid Dexron-ULV can endure 150,000 miles.
Those are assertions from manufacturers only, of course. The extended fluid change intervals appeal to the everyday consumer. To better get an idea, browse through the owners’ forum for your particular vehicle model. Other owners should chime in and provide a conservative gauge on when to replace your transmission fluid.
With that said, if you’re gentle on your car and powertrain, then you should be able to make do with 60,000-mile fluid changes. Gentle meaning that you rarely put a high load through your transmission. Therefore, this applies if you don’t tow or don’t perform spirited drives often. Going off-road also puts an immense load on your transmission and differential. Granted, note how a transmission fluid change cost varies depending on what transmission you have:
Automatic Transmission Fluid Change
Most automatic transmission maintenance guidelines apply to dual-clutch transmissions as well. Dual-clutch transmissions are more akin to manual transmissions with only two clutch packs. However, if you’re behind on maintenance, the clutch packs can fail catastrophically relatively quickly. It’ll also cause shifting issues throughout all gears.
That said, ensure that you’re using transmission fluid designed for DCT purposes. DCT fluids are generally more expensive though. These fluids are formulated to handle extreme pressures with anti-wear additives for the constant mesh gears.
DCT fluids and filters should be replaced every 40,000 miles to be on the safer side. You definitely don’t want to skimp on maintenance for DCT-equipped vehicles. This means using parts that are up for the job. Typically, DCT routine maintenance can cost somewhere between $300 to $700 depending on your car model.
CVT Transmission Fluid Change
CVTs have generally had a negative perception. Using a steel belt generally meant that it was not as durable and early on some manufacturers claimed that CVTs don’t need maintenance at all. This is of course false once again, as metal shavings can contaminate the fluid and reduce its friction properties.
Nowadays though, CVTs can actually endure the test of time if taken care of. Again, the maintenance schedule is very similar to automatic transmissions. For CVTs to last long you’ll want to replace the fluid every 30,000 miles for normal to heavy usage, and 60,000 miles for gentle applications.
While ATF can be used for CVT transmission if needed, it’s definitely not recommended. CVTs are constructed very differently from conventional automatic transmissions. It runs by turning a flexible output pulley with a steel belt. CVT fluids have friction modifiers to reduce slippage on the belt itself. ATFs actually have friction-reducing modifiers to prolong transmission life instead.
CVT fluid changes can be a bit more expensive due to the unique fluid it uses, but it generally needs less fluid. Expect to spend around $200 to $300 for a CVT fluid change depending on the workshop you consult.
Manual Transmission Fluid Change
Manual transmissions are favored by many for the involved experience and are generally more robust as a means of delivering power to the wheels. Prior to the vast improvements developed in automatic transmissions, manual transmissions are preferred. With that said, the maintenance schedule remains similar to other transmissions.
Unlike the aforementioned transmissions, manual transmissions fluids are used primarily to lubricate the constant mesh gears within the transmission. Shifting is taken place by operating the shift lever which mechanically pushes shift collars that connects the input shaft to the output shaft. The clutch is dry and operated by the driver.
You’re recommended to replace manual transmission fluid every 30,000 miles for most vehicles. For heavy usage, the interval should be shortened to every 15,000 miles. Manual transmission fluid can range from $5 per qt to $20 per qt due to varying properties. They also often have no filters that need changing. That is generally achieved by a magnetic drain nut that traps metal shavings in the fluid.
How To Change Transmission Fluid
The great thing about routine maintenance items is that manufacturers generally design them to be easy to work on. This applies to every type of transmission your car might have. In most cases, replacing the transmission fluid is no more complicated than an oil change. That said, removing the fluid pan and replacing the filter can be time-consuming.
Depending on where you live, the high repair cost can be attributed to high labor costs. Therefore, performing a DIY fluid change can save you the labor cost. With a bit of mechanical aptitude, it should be a straightforward job.
1. Tools Needed For Transmission Fluid Change
Before you commit yourself to the fluid change though, you’re going to need basic hand tools. A socket set can speed up the process considerably. Floor jacks and jack stands are also necessary so you can access the transmission fluid pan. For some cars, you might need to purchase the transmission dipstick separately as a special tool.
You should also consider purchasing a drain pan that makes it easy to drain and contain used oil for disposal. In most cars, you can just refill the transmission fluid from the dipstick tube with a basic funnel (and to learn more, check out our guide on will a torque converter fill itself). The tube might be low, so a funnel with a long flexible neck can be invaluable. A creeper or just some cardboard boxes to lay on would be worthwhile too.
Some cars that don’t have a dipstick tube require the use of a transmission fluid hand pump though. You’ll also need a diagnostics scanner to determine the fluid level afterward. Other than that, you’re going to need the recommended transmission fluid for your car and the transmission service kit. The kit should include the filter and fluid pan seal.
Search online for the transmission fluid specifications of your car. If applicable, look for documentation regarding the procedure of replacing the transmission fluid for your car. It will ease the process considerably knowing what you’re getting yourself into.
2. Draining The Old Transmission Fluid
First, you’ll need to jack up your car. Look for proper jacking points on your car and make sure the ground surface is relatively flat. The owner’s manual should contain information on jacking your car. Locate the jack that stands somewhere sturdy. Before getting underneath your car, give it a good shove to make sure it won’t slip off the stands.
To ensure that you have a clean drain, you might want to start your car and row through the gears. You would want the transmission fluid to be warm, but not uncomfortably hot. It’ll also speed up the draining process. Shut off the engine and crawl underneath your car. The drain nut should be on the bottom of the transmission, or on the fluid pan itself. Be wary of the hot exhausts around the transmission.
Ready the drain pan and remove the drain nut. Allow the fluid to drain itself for approximately 5 minutes. When it’s nearly empty, plug the drain nut back in. The next step is to remove the fluid pan. In most cars, this should be quite straightforward. In some rear-wheel-drive cars though, you might need to remove the transmission cross-member for access.
Before removing the pan, you should keep the drain pan underneath. There will be residual transmission fluid in the fluid pan and also transmission fluid will continuously drip from the transmission. It’s going to be quite messy unless you’re extremely cautious.
A complete fluid change also encompasses replacing the fluid in the torque converter. There’s usually a plug covering the torque converter. You might need to turn the engine over by hand to reveal the drain plug for the torque converter.
With the transmission fluid pan out of the way, you should be able to replace the filter easily. Some can be removed by just pulling it, others might be bolted in. Don’t just yank it out immediately. Also, replace the transmission fluid pan seal and clean the sealing surfaces. Reinstall the transmission fluid pan, taking care not to over-torque the bolts.
3. Refilling The Transmission With New Fluid
It helps to know the amount of transmission fluid needed for your transmission beforehand. To be on the safe side, fill in less than the specifications first. This might be done from either the fill hole or the dipstick tube depending on your car. Afterward, lower the car and start the engine. Take the car out for a drive to get it to operating temperature.
Park the car on a level surface and shift into neutral gear. Pull out the transmission dipstick, wipe off the transmission fluid, insert it and pull it out again. Check whether the fluid is between the indicated maximum and minimum. Some dipsticks have a hot and cold indicator as well. Cars without a dipstick may require you to drain off the excess fluid from the drain hole.
Transmission Fluid Change VS Flush
Sometimes, your mechanic might recommend you to perform a transmission flush. This is basically replacing the entire transmission’s worth of fluid with new fluid. Sometimes this is necessary because while you can drain the transmission fluid, you can’t do a complete drain. There will still be old fluid leftover in the valve body and within the transmission itself.
There are machines that are purpose-built for forcing new fluid through the transmission. However, DIY flushing can be done by draining, filling, running the transmission, and repeating the steps 2 or 3 times. You can also remove the fluid return line and allow the old fluid to bleed out from the transmission.
Flushing becomes necessary when there are signs that your transmission fluid is contaminated or overheated. Contaminated meaning if it’s too dirty or has coolant mixed in. Of course, if coolant is mixed with the fluid, a leak has definitely developed that needs rectifying before flushing out the contaminated fluid.
That said, if inspecting your fluid shows signs of contamination or overheating, then there’s a good chance that internal damage has occurred. Flushing is a temporary remedy at best. If you take proper care of your transmission, a transmission fluid flush shouldn’t be needed at all.
Normally when conducting a transmission flush, you would need about 1 or 2 quarts of extra transmission fluid. The labor costs are higher, but some workshops or dealers offer transmission flushes at the same rate. Therefore, expect to pay about $50 to $100 more for a transmission flush.
Transmission Flush and Fluid Exchange Facts
- A transmission flush and a fluid exchange are different services that help keep a car’s transmission running smoothly.
- A transmission flush requires a professional-grade flush machine to completely remove all the automatic transmission fluid (ATF) from the transmission, flush away grime and contaminants from the torque converter and cooler lines, and refill the system with new ATF. A transmission fluid exchange only drains ATF from the pan using natural gravitational forces and only drains 20% to 40% of the total ATF volume.
- ATF lubricates, cools, and cleans the internal transmission parts. Aging ATF becomes thin and dirty, losing its ability to remove heat and causing transmission wear. Changing ATF periodically can extend transmission life and help maintain a vehicle’s warranty.
- Synthetic transmission fluid lasts longer, lubricates better, and is more effective in combatting heat and friction, but may degrade certain transmission components. It is important to use the right type of transmission fluid for a specific car (like the 2014 Ford Fusion transmission fluid) and consult the owner’s manual or a trained technician.
- A transmission fluid flush typically costs between $125 to $250, while a transmission fluid change costs between $80 and $250, depending on factors such as the car’s year, make, and model, location, service center, method of flushing, type of ATF used, amount of fluid required, and additional services such as filter replacement and pan removal.
- During a transmission fluid flush, the cooler flush method uses the pressure produced by the transmission pump to circulate the ATF, but some of it may land in the pan without going to the cooler, and the old ATF is not completely replaced but continuously diluted with new ATF. The pump inlet flush method is more complete but requires the removal and replacement of the pan and filter, and more fluid and time.
- During a transmission fluid exchange, the car is test-driven to warm the ATF to normal operating temperature, the transmission pan or drain plug is removed to drain the fluid, the filter and gasket are replaced, and new ATF is added to the used ATF still inside the torque converter, and the car is driven again to ensure proper shifting, no ATF leaks, and no warning indicators lights.
- Some drivers choose to perform a transmission fluid exchange themselves, but they need the right tools, a large catch pan, and a bag of clay cat litter to soak up spilled ATF.
- The cost of a transmission fluid change depends on whether it is a DIY job, the make and model of the car, the amount of ATF used, and whether the filter and pan gasket are replaced. A professional service may also incur labor costs.
FAQs On Transmission Fluid Change Cost
If you still have some uncertainties about a transmission fluid change cost, our FAQs here might help…
How Much Does A Transmission Fluid Change Cost
When wondering about how much a transmission fluid change costs, the fluid itself isn’t expensive. Most transmission fluids cost as little as $10 per quart. Although, most cars these days, with their complicated gearboxes, may need around 7 to 8 quarts of transmission fluid at a time. We also have to consider the cost of the transmission fluid filter. These usually cost around $20 to $50, and it’s good practice to replace them alongside the fluids. Altogether, you’re generally looking at roughly $150 to $250 for an average transmission fluid change cost.
Sealed Transmission Fluid Change Cost
One major downside with sealed transmissions is that they’re much harder to service. Even for seasoned DIYers and enthusiasts, doing any servicing work or repairs with a sealed transmission at home is a bad idea. The sealed-shut nature of these gearboxes means that you need special tools to open them up if you need to do anything. This also includes changing the transmission fluid. This is bad since sealed gearboxes don’t have any dipsticks that you can check the transmission fluid with. A transmission fluid change cost with sealed transmissions will no doubt cost more, owing to the amount of labor required.
Transmission Fluid Change Cost Walmart
Starting from 2022, Walmart’s Auto Care Centers no longer offer any transmission fluid changing or flushing services. However, they do offer you the option of having your transmission fluid checked and refilled. So, just in case your gearbox is leaking and are running a bit short, you can opt for a quick top-up. Walmart bundles transmission fluid services under their Oil And Lube Service for $19.88.
Jiffy Lube Transmission Fluid Change Cost
Unlike Walmart, Jiffy Lube offers a wide variety of transmission fluid services. This includes fluid changes, and their quotes for a transmission fluid change cost are quite reasonable. They have a basic drain and fill service (just a simple change, not a thorough flush) for $55.99, though this doesn’t include the cost of the fluids. They then offer a T-TECH Combo service, which includes a new transmission fluid filter, for $160. A simpler option is their T-TECH Transmission Service package, which includes synthetic transmission fluids, for $145. Meanwhile, a thorough automatic transmission fluid change cost is $135.99.
Valvoline Transmission Fluid Change Cost
Valvoline offers a much simpler transmission fluid change cost quote. Transmission fluid changes at Valvoline’s service centers will cost between $119 to $179. This is dependent entirely on what type and brand of transmission fluids you’re using. Plus, you also have to take into account whether or not you’re also swapping out the transmission fluid filter.
How Much Transmission Fluid Do I Need
One factor to consider with a transmission fluid change cost is how much fluid your car needs. On average, most passenger vehicles take between 4 to 17 quarts of transmission fluid. In essence, it’s dependent on the size and complexity of the gearbox. If you have a simpler 4-, 5-, or 6-speed transmission, it won’t require too a lot of fluids. However, a larger and more complex setup, such as 8-, 9-, or 10-speed transmissions, needs more fluids to lubricate their more numerous moving parts. To be more precise, a tiny 4-speed gearbox would require as little as 2.5 to 3 quarts. Meanwhile, a modern 9- or 10-speed transmission might need 7 to 8 quarts.
How Much Is A Transmission
Failure to maintain your transmission, such as neglecting a transmission fluid change, can result in complete transmission failure. At which point, you have several options. The first would be to repair your transmission, which is often difficult in the case of missing an overdue transmission fluid change. Mainly, your gearbox would be in such a bad shape, that repairs won’t suffice. The alternatives would be to either rebuild or replace the transmission. Rebuilding (where you’re swapping out only the worn parts of a gearbox and keeping the good ones) will cost you around $1,000 to $3,000. This is slightly cheaper than an outright transmission replacement, which tends to cost around $1,500 to $3,500, though it can easily go higher. A neat trick is finding salvaged transmissions, which could sometimes cost you less than $1,000.
When To Change Transmission Fluid
If you’re curious to know when is a good time to replace your transmission, you can always refer to your owner’s manual. Typically, if you want to play it safe, replacing the transmission fluid every 30,000 miles is your best bet. However, transmission fluids should commonly outlast this, ordinarily upwards of 60,000 miles. In some cases, there are even specialty synthetic transmission fluids that are good for up to 150,000 miles between changes. A transmission fluid change interval not only varies on what car you drive or what type of fluid it uses but also on the type of your car’s transmission. Depending on what type of transmission you have – automatic, manual, CVT, etc. – you may have to change the fluids more regularly or otherwise.
How To Fill Transmission Fluid
In most cars, you should be able to pop open the hood and find the transmission fluid reservoir. Just make sure that you consult with your owner’s manual to discern between the transmission fluid reservoir and your motor oil reservoir. Then, remove the transmission fluid dipstick, and start pouring in the right type and amount of transmission fluid for your car. You can find the latter details in your owner’s manual. If you’re changing the transmission fluid after completely draining it, you’d usually need around 9 to 13 quarts to completely fill it up. Or, if you’re doing a simple re-fill, add 1/4 of a quart of transmission fluid at a time. Then, check with the dipstick to make sure that you’re not over- or under-filling the reservoir.
How Much Is A Transmission Flush
Should your old transmission fluid turn into a sludgy solution, is filled with grime, or has debris floating around in it, a transmission flush is recommended. It’s a process where you’re using a special machine to forcefully drain out all the old transmission fluids. So, that it could be replaced with a new, cleaner solution. However, it’s worth noting that a transmission flush can cause damage inside of the transmission if done improperly. So, it’s worth trusting a precarious task like this to a professional. A typical transmission fluid flush would cost you between $125 to $250. Much of this is due to the added cost of filling in more fluids – as you’re draining the entire system, you’ll need more transmission fluids to replace it than just changing it.
How Long Does Transmission Last
The transmission is an integral component of your car. As such, it’s typically made to last a long time, often lasting the entire lifetime of your vehicle. On average, a transmission could last for upwards of 300,000 miles before a serious restoration or rebuild is even necessary. This equates to nearly 30 years worth of driving. However, transmissions may die out far sooner, depending on key factors such as maintenance. You’ll have to stay on top of changing the transmission fluid regularly. Plus, you’ll have to consider just how much load you’re putting on it. Aggressive driving, towing or hauling a lot of load, or not shifting properly will put a lot of strain on your transmission. Thus, causing it to wear out and die much faster, sometimes failing in under 100,000 miles.
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Thank you for the useful info. I learned a few things after finding your site. 👍
Thanks for the comment, ReAnna Murphy!
Cheers, glad to hear that we’ve been of some assistance 🙂
My car, mercedes model B170 suddenly shift to lower gear when running on the road. Once stop for a moment and restart, car going smoothly. I hv flusing and replace fluid transmission but still not solve. After diagnosis, electronic box transmission problem. Do you have electronic box to me or you got another solution to this matter. Tq on your feed back.
Thanks for the comment, redelan!
Sorry to hear about your problem, but it’s good to hear that you’re all good. If changing the transmission fluid hasn’t solved it, this does sound like an issue with the transmission module, or perhaps another electrical fault. It could be the shift solenoid or perhaps even a valve body malfunction. It’s best that you get that checked out pretty soon, though. Hope that helps 🙂