​A Guide to Maintaining your Hyundai’s Transmission

Caring for your Hyundai's transmission starts with maintenance and will possibly include basic repairs or even a total transmission rebuild. Northern California commuters experience congested freeway traffic that accelerates up to 50-miles per hour and then often brakes to a complete stop due to heavy traffic. Commuters from Sacramento, Modesto and Fresno, share common complaints about the stress that the traffic puts their transmission through due traffic congestion and four-way stops. 

The Importance of Transmission Maintenance

Your transmission fluid cools and lubricates the transmission’s internal components, which transfers power from your Hyundai’s engine to its wheels. The automatic transmission shifts your vehicle into different gears as your speed accelerates and decelerates. The automatic transmission uses an oil pan that contains the transmission fluid and filter. This fluid delivers the power or force that is needed to shift the vehicle into different gears. Manual transmission cars have a case that contains transmission fluid, and in a manual transmission, the fluid is not critically involved in changing the gears.

The manual transmission is a mechanical system, while the automatic transmission is a hydraulic system. When an automatic transmission lacks fluid or has dirty fluid, the transmission may begin to slip and will eventually fail. When a manual transmission requires fluid or has dirty fluid, the transmission becomes noisy, the parts receive excess wear, and the transmission will eventually fail.


• Your automatic transmission fluid service will include the replacement of the pan gasket, filter and fluid. But, some vehicle transmissions are non-serviceable and are sealed for life. These transmissions do not require maintenance. Check the vehicle’s manual to confirm if you have a sealed system.

• The manual transmission does not use a filter, and when the components begin to wear, the fluid will become contaminated with particles of metal. A transmission fluid service is necessary for your manual transmission. Complete the maintenance as per your manufacturer’s recommendations.

• Complete a transmission fluid service every 40,000-miles. If you see fluid under the car, have it inspected as-soon-possible. Regularly changing your Hyundai’s transmission’s fluid should extend the life of the vehicle’s transmission.

• Transmission fluid services should be a regular part of your maintenance schedule and will increase the life of your transmission. Ninety-percent of automatic transmission failures is due to overheating when the transmission fluid is not replaced.

Changing the Transmission Fluid

1. Drain the fluid from the transmission

2. Install a new pan gasket and a filter(Automatic vehicles only) 

3. Replace the correct type and quantity of transmission fluid 

4. Check for any possible leaks

5. Test drive your vehicle

Signs to Change the Transmission Fluid

• Difficulty running

• Stalling when going up or down steep inclines

• Check Engine Light 

• Noise from the transmission 

Broken Transmission Mount

Your engine mount is comprised of rubber and steel, and it secures both the engine and transmission to the vehicle’s frame. The motor mount absorbs jolts, shocks and engine vibrations so that the ride is smooth. Transmission mounts are used to secure your Hyundai’s transmission. Most cars vehicles have multiple engine and transmission mounts. If a mount breaks, you will experience a significant amount of engine vibration, shaking and movement.

Transmission Mount Repairs

If you locate an engine or transmission mount that is broken, replace it quickly and do not continue to drive your car with a broken engine or transmission mount. Driving with a broken mount may cause severe axle shaft or transmission damage. Some engine mounts contain oil, which may leak when the mount is damaged.

1. Identify a broken mount

2. Remove the broken mount and replace with an OEM mount (A genuine OEM mount is factory designed for a perfect fit and easy replacement)

Signs that a Mount is Broken

Engine mounts are not commonly checked during a general maintenance appointment, but you should check the mount if the motor is vibrating, clunky or noisy.

• Bumping or clunking sounds with engine or transmission movement.

• Loud noise when the car is put into gear.

• Vibration while accelerating and driving uphill.

• Movement in the engine area while driving the vehicle.

• Oil leak due to a damaged fluid-filled mount

The engine mount holds your vehicle's engine and transmission in place. This mount also absorbs the shocks of the road as-well-as engine and transmission vibrations. If the mount is broken and unstable, the transmission and engine are no longer secure and are subject to increased vibration and shock. This could cause more extensive damage to additional vehicle components and make your car ride rough.

A Bad Transmission Speed Sensor

The engine and transmission rotate at different speeds, and the vehicle’s computer calculates the speed of the transmission input shaft or torque converter. The transmission has a magnetic speed sensor that provides this information and allows the transmission to shift accordingly. The transmission sensor counts the number of the transmission’s internal revolutions and transmits this information to the control unit, where this data is then used to determine the rotational speed. When the speed is too great, the gears must be changed. The driver of a manual transmission uses the tachometer to determine when the RPMs are getting too high and the engine must be manually shifted.


• The engine mounts sometimes must be removed to access a bad speed sensor.

• The sensor must be replaced and not repaired.

• A failed transmission speed sensor may not be the problem, because a failed ABS sensor and other possible issues may present in the same way. A complete professional inspection should be completed to determine the actual problem.

Replacing the Speed Sensor

1. Verify that the transmission speed sensor must be replaced. 

2. Lift and properly support the vehicle on car jacks.

3. Remove the transmission speed sensor (inside the transmission housing). 

4. Install a new transmission speed sensor with an OEM part for easy replacement.

5. Connect the new transmission speed sensor.

6. Test drive the vehicle and check that the transmission speed sensor is operating properly.

Signs of a failing Transmission Speed Sensor

• The vehicle shifts roughly

• The car cannot shift into higher gears

• The odometer or speedometer isn’t working

• The cruise control isn’t working

Replace the sensor as soon as possible, because the failed transmission control unit will not calculate the actual speed and shifting gears will become more difficult or impossible.

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