What Are the Signs of a Failing Transmission? Your Essential Guide
Posted on March 25, 2025
Your car’s transmission is a crucial component that connects your engine to your wheels, ensuring power is smoothly transferred to keep you moving. But when your transmission starts failing, it can cause significant issues that, if left untreated, lead to costly repairs.
The challenge? Transmission issues don’t always announce themselves loudly. Unlike a flat tire or squeaky brakes, the signs of a failed transmission can be subtle and easy to overlook.
Are there any signs that the car transmission is failing? Absolutely. Catching these early warning signals can save you from expensive repairs and prevent more serious damage.
In this blog, we’ll explore the key signs of a failing transmission and guide you through what to do when your transmission starts showing signs of distress.
What is a Car's Transmission?
A car’s transmission is the vital component that transfers power from the engine to the wheels, allowing your vehicle to move. Think of it as the middleman between the engine and the drivetrain, converting the engine’s energy into the torque needed to turn your wheels.
Torque is the rotational force that keeps your car in motion, and the transmission ensures this force is delivered smoothly and efficiently. Without a functioning transmission, your car simply won’t drive—it’s that important.
It plays a critical role in controlling speed and power, making it essential for both performance and safety. To avoid costly repairs or being stuck with a car that won’t move, it’s important to recognize the early signs of failing transmission.
Understanding The Importance of Transmission Maintenance
Your vehicle’s transmission is a key player in keeping your car moving and performing at its best. Regular maintenance ensures this complex and essential component stays in top shape, preventing issues that could leave you stranded or facing expensive repairs. Here’s why transmission maintenance matters:
1. Enhanced Performance
Fresh transmission fluid allows for smooth gear shifts and optimal performance. Regular service minimizes wear and tear, reducing the chance of transmission failure and ensuring your car runs smoothly.
2. Extended Lifespan
Keeping your transmission clean and well-lubricated can significantly extend its life. This helps you avoid the costly expense of an early transmission replacement.
3. Improved Fuel Efficiency
A healthy transmission helps your car operate efficiently, which translates to better gas mileage. Regular maintenance ensures your transmission works effectively, saving you money at the pump.
4. Prevention of Costly Repairs
Skipping transmission maintenance can lead to serious issues like slipping gears, overheating, or even complete failure. Staying on top of routine care can prevent these problems, saving you from unexpected and costly repairs.
By prioritizing regular transmission maintenance, you can keep your vehicle running smoothly, avoid unnecessary expenses, and enjoy a more reliable driving experience.
Does Transmission Affect the Engine?
Yes, your vehicle’s transmission plays a crucial role in how your engine performs. It converts the engine’s power into the movement needed to turn your wheels. If the transmission isn’t working properly, it can put extra strain on the engine, leading to issues like overheating or even engine failure over time.
Neglecting transmission problems or low-quality fluid can worsen the damage, making timely maintenance essential for keeping both your transmission and engine in good shape.
Can a Vehicle Run Without a Transmission?
While you can technically start your car’s engine without a transmission, the vehicle won’t be able to move. Even if the transmission is partially failing, driving is unsafe and should be avoided until it’s repaired.
A faulty transmission limits your control over speed, putting both you and others at risk on the road. Prioritize proper transmission service to ensure safe and reliable driving.
Top 12 Warning Signs Your Car's Transmission is Failing
Your car’s transmission is crucial for smooth driving, but when it starts to fail, it can lead to bigger problems. Here are the top signs that your transmission might be on the fritz so you can take action before it's too late.
1. Difficulty Switching Gears
If your transmission starts slipping, you’ll notice a loss of power and acceleration, and your engine may rev higher than normal without increasing speed. This happens when the transmission isn't engaging the right gear.
In manual transmissions, slippage is often caused by a clutch issue, such as a worn clutch or low fluid. This can lead to the engine revving without proper movement and may also cause squealing or grinding noises.
For automatic transmissions, slippage can be due to low fluid, worn gears, clogged filters, or faulty hydraulic pressure systems.
2. Burning Odor
A burning smell from your transmission usually means the fluid is overheating or running low. If you notice a scent similar to burned rubber, it's a sign that something’s wrong.
In this case, take your car to a repair shop as soon as possible. Having the transmission fluid flushed and replaced can help prevent further damage and avoid a costly repair. It’s a service we’re happy to provide at our CarHub Service Departments.
3. Strange Noises in Neutral
If you hear unusual sounds while your car is idling in neutral, it could be a sign that your transmission needs attention.
The issue might range from something simple like low transmission fluid to more serious problems like worn bearings or damaged gears. Either way, it’s important to have a professional inspect your vehicle to avoid further damage.
4. Gear Slippage
Over time, the gears in your transmission can wear down, causing them to slip out of sync when shifting. This wear and tear can worsen if your transmission fluid is low or degraded.
Slipping gears are dangerous and should be addressed immediately. Early diagnosis and repair can save you from more expensive damage down the road.
Many modern transmissions are equipped with a safe mode to protect your vehicle. If slipping is detected, the transmission may lock into a single gear, allowing you to drive safely to a repair shop for service.
5. Clutch Dragging
A dragging clutch happens when the clutch disc doesn’t fully disengage from the flywheel, even when the clutch pedal is pressed all the way down. This can be caused by issues like worn-out clutch discs, faulty transmission mounts, or problems with the clutch linkage.
If you notice hard shifting at high RPMs, along with a grinding sound while changing gears, it’s a sign that your clutch may be dragging and should be checked.
6. Fluid Leaks
If you notice a puddle of liquid under your car after parking, it’s time to take a closer look. If the liquid is clear and looks like water, it’s likely from your AC and not a big deal. However, if it’s red or brown, it could be transmission fluid, which is a sign of a potential issue.
The transmission is a sealed system, meaning it shouldn’t leak fluid when functioning properly. To check, place a piece of cardboard under your car to catch the liquid. If it’s red or brown, it’s time to get your transmission checked to prevent further damage.
8. Illuminated Check Engine Light
Modern vehicles are equipped with sensors that alert you to potential issues through the car’s computer system. The check engine light is one of the most common warning signals, and it should never be ignored.
If your check engine light turns on, it’s essential to visit a professional repair shop promptly. Skilled technicians will use diagnostic tools to identify the problem and recommend the necessary repairs to keep your car running smoothly.
9. Grinding or Shaking
If your car shakes when shifting gears, it's a sign of potential transmission problems. In automatic transmissions, this often starts as hesitation when changing gears. For manual transmissions, you might notice gear grinding.
It's a good idea to have a professional technician check your car to identify the issue and suggest the right solution.
10. Unusual Sounds
Every car has its own familiar sounds, and unusual or loud noises can be a sign of transmission trouble. These noises vary depending on whether your car has an automatic or manual transmission.
In automatic cars, transmission issues often cause milder sounds, while manual vehicles may produce louder clunking noises, especially during gear shifts. Keep in mind that clunking sounds can also come from other parts of the car.
11. Lack of Responsiveness
If your car hesitates or fails to shift into the correct gear, it’s a clear sign of transmission trouble. For automatic transmissions, this might feel like a delay when shifting from drive to park or a hesitation when changing gears.
For manual transmissions, the issue often shows up as a disconnect between the engine’s RPMs and the actual vehicle speed—your engine might be revving high, but the car accelerates slowly or not at all. These signs of transmission failing indicate a potential problem with your transmission.
12. Reduced Transmission Fluid Level
Noticing suspicious fluid spots on your driveway could be a sign of a transmission fluid leak, which is a serious issue that needs immediate attention.
If you drive an automatic transmission vehicle, stop as soon as it’s safe, let the car cool down, and check the transmission fluid level using the dipstick under the hood. Low fluid levels usually point to a leak in the transmission system.
13. Loss of Power
If you notice your car struggling to accelerate or losing power on hills, it could be a sign of transmission issues. Often, this happens when the transmission is slipping gears, which can be caused by low fluid, faulty torque converters, or problems with the transmission control module or shift solenoids.
If your car is having trouble maintaining speed or accelerating smoothly, it’s best to get it checked out before the problem worsens.
Strange Sounds That Indicate Transmission Trouble
We've already mentioned that strange sounds can indicate transmission problems, but knowing the different types of sounds can help you pinpoint the issue. Here’s a breakdown of the various sounds that could signal transmission trouble.
1. Whining or Humming
A whining or humming noise, which can get louder with speed, may point to a problem with the transmission fluid pump or low fluid levels due to leaks. It could also signal worn internal parts or a failing torque converter in automatic transmissions.
2. Clunking or Chattering
Clunking sounds during gear shifts, especially in manual transmissions, can mean worn gear synchronizers. In automatic transmissions, it might be due to issues with the hydraulic system, worn mounts, or linkage.
3. Grinding
Grinding noises often happen in manual transmissions when the clutch isn’t disengaging properly. For automatic transmissions, it can indicate damage in the planetary gear system, where gears grind against each other or the housing.
4. Buzzing or Clicking
Buzzing or clicking sounds are usually linked to transmission fluid pressure issues caused by a failing pump, clogged filters, or leaks. It means the transmission isn’t getting enough fluid to function smoothly.
5. Rattling
Rattling noises often suggest something is loose inside the transmission, like a bolt or broken part. It could also point to a problem with the torque converter, especially at low speeds.
6. Banging or Knocking
Banging or knocking sounds, especially during acceleration or gear changes, can indicate serious internal damage, like worn or damaged gears and bearings.
7. Squealing or Screeching
A squealing or screeching noise when starting the car or changing gears could signal an issue with the transmission’s belt or chain. In CVTs, worn transmission bands may cause a similar sound.
What to do if the Car Transmission Fails
If you're experiencing transmission issues, you must take action quickly to avoid further damage. Here are the steps you can follow:
1. Check Fluid Levels
Start by checking your transmission fluid. Low fluid levels can cause many transmission issues, and topping it off might solve the problem. If fluid levels are fine, then the issue might be more serious.
2. Look for Obvious Signs of Leaks
If fluid levels are low, check for leaks under the vehicle. Leaking transmission fluid can lead to significant damage if not addressed.
3. Pay Attention to Symptoms
Notice any strange sounds, shifting problems, or warning lights on the dashboard. These could be signs that your transmission needs attention.
4. Consult a Professional
If simple checks don’t resolve the issue or you’re unsure about the cause, it’s time to consult a professional. A certified mechanic can run diagnostics to pinpoint the problem and recommend the best course of action.
At CarHub, our experienced technicians are here to help with comprehensive transmission services, ensuring your vehicle runs smoothly and efficiently.
5. Get Service ASAP
If you’re experiencing any of the symptoms listed or other transmission problems, don’t wait. Contact a trusted service center, like CarHub.s Service Department, to request a professional inspection and service. Addressing transmission problems early can save you from expensive repairs down the road.
How To Prevent Transmission Failure
Preventing transmission failure starts with regular care and attention to your vehicle’s needs. By following a few simple steps, you can help ensure your transmission stays in good condition and avoid costly repairs down the road.
Let’s take a look at some easy ways to keep your transmission running smoothly.
1. Regularly Check and Change Transmission Fluid
Transmission fluid is crucial for keeping the system running smoothly. Regularly check the fluid level and its condition to ensure it’s in good shape.
Over time, transmission fluid can break down and become less effective. Dirty or old fluid can cause increased friction and overheating, leading to potential transmission damage.
Follow the manufacturer’s recommendations for fluid changes, typically every 30,000 to 60,000 miles, though this may vary based on your driving habits and conditions.
2. Use the Correct Type of Transmission Fluid
Automatic and manual transmissions require different types of fluid. Automatic transmission fluid (ATF) is thinner and contains detergents, additives, and friction modifiers for smooth hydraulic operation.
Manual transmission fluid, however, is thicker and mainly designed for lubrication without the added detergents or modifiers found in ATF.
Using the wrong fluid can cause poor lubrication, overheating, and excessive wear on your transmission. Always check your vehicle’s manual or consult a mechanic to ensure you're using the correct fluid for your transmission.
3. Inspect Transmission Seals and Gaskets
Regularly checking the seals and gaskets in your transmission is crucial to prevent fluid leaks. Over time, these components can wear out or become damaged, allowing fluid to escape.
Low fluid levels from leaks can cause the transmission to run dry, leading to increased friction, overheating, and damage.
By keeping the seals and gaskets in good condition, you help ensure that your transmission stays properly lubricated and runs smoothly. It’s a simple check that can save you from more costly repairs down the line.
4. Service Your Transmission Regularly
Regular transmission service is about more than just changing the fluid—it’s about keeping your entire transmission system in good shape. This includes:
- checking and replacing the transmission filter if needed
- looking for any fluid leaks
- inspecting the transmission for signs of wear or damage
Catching small issues early can help prevent bigger, more costly problems down the road.
By servicing your transmission regularly, you can keep everything running smoothly and avoid expensive repairs. Make it a habit to have your transmission checked to ensure it stays in top condition.
5. Prevent Overheating
Your transmission can overheat from heavy use, like frequent stop-and-go driving, towing, or hauling heavy loads. Overheating is one of the quickest ways to damage your transmission, leading to costly repairs.
To prevent this, consider installing an auxiliary transmission cooler, especially if your vehicle is regularly under heavy strain. A cooler helps maintain the right temperature, ensuring your transmission operates smoothly and stays protected.
6. Maintain a Healthy Cooling System
The radiator plays a crucial role in cooling your transmission fluid, helping to prevent overheating. If your cooling system isn’t working properly, your transmission could overheat, leading to potential damage.
Regularly checking the coolant levels, inspecting hoses, and ensuring the radiator is clean and functioning can help keep your transmission at the right temperature. Maintaining your cooling system is an important step in avoiding costly transmission repairs and keeping your vehicle running smoothly.
7. Warm Up Your Vehicle in Cold Weather
In colder climates, like Canada, you need to give your vehicle a few minutes to warm up before hitting the road in winter. This allows the transmission fluid to reach its ideal temperature, which helps it flow more smoothly and provides better lubrication.
By doing this, you'll help prevent unnecessary strain on your transmission and ensure it operates more efficiently in the cold. A quick warm-up can also improve overall performance and reduce the risk of damage in harsh winter conditions.
8. Avoid "Rocking" Between Gears
If you get stuck in snow, mud, or another tough spot, it can be tempting to rock your vehicle back and forth between gears to free it. However, this can put a lot of unnecessary stress on your transmission and create excess heat.
Constantly shifting between gears can lead to premature wear and even damage the transmission. Instead, try shifting to a lower gear and gently accelerating, or use other methods like traction mats or calling for assistance to avoid putting your transmission at risk.
9. Stay Out of Neutral at Red Lights
Shifting your automatic transmission into neutral at red lights or while idling might seem like a good idea, but it can actually cause extra wear on your transmission over time. Constantly shifting in and out of neutral puts unnecessary strain on the system.
It's usually best to leave your car in the drive while stopped. This helps reduce wear and keeps your transmission running smoothly.
10. Practice Safe Driving Habits
How you drive can have a big impact on your transmission’s health. Avoid aggressive behaviors like rapid acceleration or hard braking, as these can put unnecessary strain on the transmission. Instead, try to accelerate and brake smoothly and steadily, which helps reduce wear and tear on the system.
For manual transmissions, make sure you fully engage the clutch when shifting gears to avoid grinding, which can damage the gears over time. By practicing these simple, gentle driving habits, you’ll help your transmission last longer and run more efficiently.
11. Use Your Parking Brake
Always use your parking brake when parking on a hill. This helps reduce the strain on your transmission by preventing the full weight of the vehicle from resting on the parking pawl, a small component in the transmission that holds the car in place.
By engaging the parking brake, you distribute the weight more evenly and help protect the transmission from unnecessary stress. It’s a simple habit that can prolong the life of your car’s transmission and ensure smoother operation.
12. Address Issues Quickly
If you notice any signs of transmission trouble—such as fluid leaks, strange noises, or difficulty shifting gears—you need to get them checked out right away. Ignoring these warning signs can turn small problems into costly, major issues.
Addressing them early helps prevent further damage and ensures your transmission stays in good working condition for longer. Always consult a professional if you're unsure or notice something unusual.
Don’t Let Transmission Issues Catch You Off Guard
A failing transmission can lead to costly and inconvenient problems, but staying ahead of the signs can save you time, money, and stress. With regular maintenance and prompt action, you can keep your transmission—and your car—running smoothly for years to come.
At CarHub, we’re not just experts in transmission repairs and routine maintenance—we also offer a wide selection of high-quality used cars to fit your needs and budget. If you’re experiencing transmission issues or simply need a tune-up, our skilled team is here to provide reliable service every step of the way.
For more helpful tips and expert advice, visit our CarHub blog. Let us help you keep your vehicle in top condition, whether you’re maintaining your current car or looking for your next one.