Signs of a damaged car transmission?

The automobile transmission is one of the most important and complex components in a vehicle’s transmission system. It is responsible for converting power from the engine to the wheel system, controlling the engine to operate within a wide speed range, and providing gear steps to suit the driver’s requirements.

However, due to continuous operation and high pressure, car transmissions can encounter problems and damage after a period of use. Recognizing the early signs of a damaged car transmission is an important factor in preventing potential and serious driving problems.

Signs of a damaged car transmission?

The car has difficulty starting and shifting gears

For cars that have been used for less than 5 years (the period in which the odometer has displayed between 8 and 10,000 km), difficulty entering and shifting gears is a common phenomenon. A common problem when they are not properly maintained. This situation also often occurs on manual transmission cars with simply designed gearboxes.

In this situation, the driver has difficulty switching from one gear to another according to his wishes. This is a sign that the car’s transmission oil is limited, dirty or has not even been changed according to the car’s correct standards.

In addition, there are also a number of other causes that cause difficulty in entering and shifting gears such as: a faulty gearbox sensor, a loose or corroded gear shift cable, or a damaged turbine blade in the gearbox torque converter. .

The car has a burning smell

The car has a burning smell

A burning smell often appears when the transmission operates in overheated conditions, leading to the transmission oil burning, causing an unpleasant burning smell and making the transmission ineffective. This phenomenon often occurs on cars that operate continuously, such as long-distance freight vehicles or vehicles with large loads. If this condition persists, the gearbox’s performance will be significantly reduced.

There are many causes for this condition, including the driver not using the clutch carefully or the transmission oil being low or rancid, causing overheating and fire. This leads to overheating of the car’s transmission, wearing out the clutch parts and creating deposits.

Other causes of a burning smell can include stuck plastic, leaking antifreeze, or a melted heater core. If you notice a burning smell, this is a clear sign that there is a problem. You should have the engine inspected to find out the cause of the smell, regardless of the cause.

Noise appears when entering “mo” gear

When the car is at rest, the transmission is in “mo” state, but there is still an unpleasant noise emitted. This situation shows that it is necessary to change the transmission oil immediately before the car’s transmission is seriously damaged. Often the main cause of this noise is that the bearings or gears inside the transmission are worn out and need to be replaced.

However, this is also a sign that the car’s gearbox has encountered serious damage. To ensure safety and avoid a worse situation, car owners should take their car to a maintenance center for a closer inspection in such a case.

The gear lever vibrates or the vehicle makes noise

The gear lever vibrates or the vehicle makes noise

For cars using manual transmissions, when the driver changes gears, if the transmission makes a clicking sound or a harsh noise, this indicates that the transmission system is having an error. With hundreds of parts contained in a transmission, a worn gear or even a housing can create an unpleasant noise.

In contrast to cars using automatic transmissions, the error sound from the transmission is not often annoying, it is usually a humming, rattling sound. However, if you feel the gear lever vibrates, shifts more difficult, or the vehicle vibrates/jerks when accelerating, it is necessary to have it checked immediately. This symptom could be related to the engine, exhaust system, or transmission. Determining exactly which part the sound is coming from is extremely important to find the corresponding treatment method.

The vehicle experiences the phenomenon of shifting gears/slip gears

The vehicle’s transmission is operating normally and maintained at the gear level the driver wants. When the appropriate engine rpm is reached, the computer system will automatically change gears to optimize fuel consumption.

However, in case the transmission slips or automatically shifts gears, the driver will feel the car reacts slowly. Sometimes, the car won’t respond at all when pressing the gas pedal. If the vehicle suddenly shifts gears to another gear or returns to “mo” without reason or action from the driver, that is a sign that the vehicle needs to be taken to a maintenance center immediately. This situation can be very dangerous and could result in loss of control of the vehicle.

The cause of a gearbox jumping or slipping is due to the slipping of the clutch part, including the friction disc, worn or oiled pressure disc, weak pressure disc or worn spring on the pressure disc.

The clutch is not cut

The clutch is not cut

This situation often occurs on cars using manual transmissions. A common sign is when the driver fully depresses the clutch but the clutch does not disengage completely. In this case, the clutch leaves continue to cling tightly to the flywheel, causing an unpleasant noise when shifting gears.

To overcome this phenomenon, the simple way is for the car owner to check and adjust the clutch pedal travel distance.

Gearbox leaking oil

Gearbox leaking oil

Transmission oil plays an extremely important role in vehicle operation and transmission longevity. Oil is used to lubricate transmission components in the transmission, reducing friction and preventing overheating. In addition, the oil also acts as a hydraulic fluid, helping the gear drive the coupling effectively.

Unlike engine oil, gearbox oil is not consumed during operation. If transmission fluid leaks, the fluid level in the transmission will decrease, causing overheating. This is a quick way to damage the transmission.

If you see a puddle of red liquid under the vehicle, take the vehicle to a service center immediately. If the oil leaking is dark brown or black and has a burning smell, it may be burned. In this case, you can only bring the car to a maintenance center for repair.

Causes of transmission oil leaks may include aging of the gasket, warping of the seal due to strong impact causing the gasket to leak, or wear of the seal after long periods of use.

Gearbox lacks sensitivity

Gearbox lacks sensitivity

The phenomenon of a gearbox lacking sensitivity often occurs when there are signs of slow gear shifting or refusal to shift gears. The driver may feel that the gear shifting process becomes slower and not as smooth as before. This can happen for many different reasons, including problems related to the electrical system, hydraulic system or even the vehicle’s engine.

In the case of a vehicle using a manual transmission, the sign of this phenomenon is usually when the driver shifts gears and the engine rpm increases, but the vehicle still feels sluggish and does not shift gears as smoothly as usual. This indicates that the cone blades may be worn or have other problems. For vehicles using automatic transmissions, this phenomenon often occurs when shifting gears into Park or Drive mode, and may be related to problems with the automatic control system or sensors.

The error light turns on

The error light turns on

The error light usually illuminates to notify that the car’s system has detected a problem with the engine, transmission, or transmission. The illumination of this warning light provides the driver with a clear signal to identify and investigate the problem.

When the transmission error light comes on and a gear icon appears on the display screen with an exclamation mark inside, there are three main causes that can cause the problem. First, the oil temperature in the gearbox may be unstable or too high, affecting the performance and protection of the gearbox. Second, the oil pressure in the gearbox may be insufficient or unstable, affecting lubrication and transmission. Third, the oil level inside the transmission may be unsatisfactory or there may be an oil flow problem, causing lubrication and transmission performance problems.

In the event that the check engine light is on, it usually indicates that there is a problem related to the engine, transmission, or transmission. Causes may include problems with the engine, engine transmission, control system or sensors. To determine the specific cause and fix the problem, the driver can use a fault code reader to read the fault code from the vehicle system, refer to the manufacturer’s manual or consult a service technician. professional care.

How to repair damaged car transmission?

Below are the basic steps to check and repair the gearbox:

  1. Inspection and Diagnosis: First, the vehicle needs to be inspected and diagnosed by repair experts. They will look for signs, listen for noises, and test shifting performance to determine the cause of the failure.
  2. Disassemble the gearbox: After determining the cause and scope of damage, the gearbox needs to be disassembled from the vehicle. This includes removing surrounding components such as the clutch, gears, and shafts.
  3. Inspect and repair parts: Parts inside the transmission, such as gears, shafts, balls, and bearings, should be thoroughly inspected to determine if they are worn, damaged, or need replacement. . Damaged parts often must be repaired or replaced with new parts.
  4. Cleaning and lubrication: During repair, the gearbox needs to be cleaned to remove dirt, grime and old oil. The parts are then lubricated with new oil or lubricant to ensure best performance and longevity.
  5. Assembly and inspection: After repair, the transmission is assembled back into its original position in the vehicle. The system is then tested to ensure that the transmission operates correctly and smoothly. This usually includes checking shifting methods, synchronization, and checking oil flow.
  6. Adjustment and calibration: Finally, after the transmission has been installed and tested, it is necessary to adjust and recalibrate the mechanisms, such as the clutch and shifter, to ensure they operate properly. way and suitable for the vehicle.

Note that repairing a car transmission requires high professionalism and technique. Therefore, for serious or complex damage problems, you should go to reputable and professional repair centers to ensure the repair is performed properly and safely.

Reputable car repair address?


CarOn Pro – 5S standard car service system

Caron Pro is trusted and known by customers as a chain of 5S standard auto repair service centers. With extremely modern equipment, genuine spare parts, skilled technicians, a full range of services at extremely affordable prices and quality. With a variety of services and products, CarOn is committed to providing the most dedicated quality and service.

Please contact us immediately via Hotline: 1900633612 or 0919009069

Facility 1 – CarOn Xuan Phuong
Lot P3, Thi Cam Street, Xuan Phuong, Nam Tu Liem, Hanoi
Phone: 0919009069
Facility 2 – CarOn Hoang Quoc Viet
455 Hoang Quoc Viet, Co Nhue 1, Bac Tu Liem, Hanoi
Phone: 1900633612
Facility 3 – CarOn Lai Xa
Km14, National Highway 32, Lai Xa, Kim Chung, Hoai Duc, Hanoi (next to Hoai Duc welcome gate)
Phone: 0384653472
Facility 4 – CarOn Care Thai Nguyen
76 Viet Bac Street, Dong Quang, Thai Nguyen
Phone: 0975782639
Facility 5 – CarOn Care An Khanh
Bao Son Paradise Villa Area, Hoai Duc, Hanoi
Phone: 0963598600

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