Hyundai gearbox problems (2023)

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Hyundai vehicles are known for their reliability and fuel efficiency, but like any other car, they can have powertrain issues. Transmission problems can be frustrating and expensive to fix, but with the right information, you can quickly diagnose and fix the problem. In this article, we look at the most common causes of transmission problems in Hyundai vehicles, along with the symptoms and troubleshooting steps that can be taken to resolve the problem.

One of the most common problems with Hyundai transmissions, even in newer vehicles, is rough shifting or jerking when the engine is still cold.Once the engine and transmission oil has warmed up, gear shifting is normal after about twenty minutes of driving.According to Hyundai, this is normal operation and within specification. We will also discuss the importance of timely maintenance and the use of the correct transmission oil to ensure the longevity and reliability of the transmission system. Whether you are a Hyundai owner or an auto enthusiast, this guide is intended to provide valuable information and help you make informed decisions about the performance and safety of your vehicle.


  • Transmission won't shift or engage
  • Check engine light comes on
  • Hyundai does not move when Gear/Drive is engaged.
  • Erratic change when cold
  • Transmission is stuck in Gear/Limp Home mode.
  • The transmission is stuck in the park.
  • Vehicle speed is limited to 30 mph.
  • Transmission between 1st-2nd-3rd team when it's cold


The most common problems with Hyundai gearboxes:

  • Low gear oil level -Common on Hyundai vehicles over 100,000 miles. This can cause hard shifting, lagging shifting, or high speed shifting.
  • Entrance and exit sensor- Failure of any of these sensors will activate the check engine light and erratic shifting. Hyundai transmission is stuck in a gear. Vehicle speed can be limited to a maximum of 45 mph.
  • clogged stream file– The transmission oil filter can become clogged with metal shavings, metal from the clutch, or broken internal parts. Changing the transmission oil and filter will likely not fix the problem, and a transmission rebuild or replacement may be required.
  • Transmission Range Selector -The transmission range switch is mounted on top of the transmission case. It's linked to the shifter in the center console, which is used to shift the transmission between Park, Neutral, Reverse, and Drive. This is a common problem on many models including 2001 to 2006 Hyundai Elantra and 2005 to 2009 Hyundai Tucson. It can affect other older models as well as Hyundai Veloster, Sonata, Genesi and Santa Fe. The selector can rust and not engage or reattach the parking position.
  • Torque converter or oil pump failure– The vehicle does not move when the gear lever is placed in gear or in reverse. This is not a common problem, but can be a problem on high mileage Hyundai vehicles over 150,000 miles.
  • PCM and TCM problem– Problems with the powertrain and transmission software can cause erratic shifting. Especially when it's cold or when you downshift. Software bugs can cause hard shifting during cold starts, especially with newer 8-speed automatic transmissions. This issue affects newer Hyundai vehicles including Elantra, Sonata, Veloster, Santa Fe, etc.
  • brake light switch– This may prevent the shift lever from moving out of or returning to the park position. Intermittent startup issues can also occur.
  • Exchange– You can use the gear lever to select gear (PRND). If it fails, it may prevent the transmission from returning to park or you may not be able to select the correct gear.
  • neutral safety switch– This could prevent the vehicle from starting or cause the shift lever to get stuck in the park position. The engine will not start in park, but will start in neutral.

Some of these Hyundai transmission problems are explained in detail below.

Hyundai 6 speed gearbox problems

Hyundai's 6-speed gearbox is a common gearbox found in many of their vehicles, and like any other mechanical component, problems can arise. Some common problems reported by Hyundai owners with the 6-speed gearbox are:

  • Delayed change:This may be due to a faulty transmission control module, a problem with the internal components of the transmission, or lack of maintenance.
  • Approximate displacement:This can be caused by worn synchronizers, bushings, gears, or bearings.
  • Leaks or low fluid levels:This can damage the transmission and cause shifting problems.
  • excessive heating:This can be due to clogged radiators, lack of fluids, or worn internal components.
  • blinking lightsOn the dash are the check engine light, transmission warning light, or gear ratio error indicator.

It is important to have any symptoms of transmission problems checked by a qualified Hyundai technician as soon as possible to prevent further damage. Regular maintenance, using the correct transmission fluid, and being aware of any recalls that may affect your vehicle are important to ensuring the longevity and reliability of your powertrain.

Hyundai 8 speed gearbox problems

Hyundai's 8-speed transmission, also known as an 8-speed automatic transmission (8AT), is a relatively new addition to its vehicle lineup, and as with any new technology, there can be some issues. Some common problems reported by Hyundai owners with the 8-speed transmission are:

  1. Shake or Shake:Some drivers have reported that they feel a jolt or judder when shifting the transmission. Various issues including low transmission oil levels or worn transmission components can cause this.
  2. Delayed change:Another common problem is the gearshift lag in the transmission. This can be caused by a faulty transmission control module or sensor, or a problem with the internal components of the transmission.
  3. Approximate displacement:Some drivers have reported harsh shifting when shifting the transmission. This could be due to worn or damaged internal transmission components, or a problem with the transmission control module or sensors.
  4. excessive heating: Transmission overheating can lead to a variety of problems, including hard shifting, late shifting, and transmission failure. Low transmission oil levels, clogged transmission oil coolers, or other issues can cause this.
  5. Warning lights onDashboard: Dashboard warning lights can be caused by a number of issues, including low transmission oil, faulty sensors, or other transmission-related issues.

It is important to note that not all 8-speed transmissions have the same problems, and many factors can cause problems. If you have any of these problems, it's best to take your vehicle to a qualified Hyundai technician who can diagnose and repair it.

Hyundai CVT Transmission Problems

CVT is found in select Hyundai models, including the Accent and Elantra, as well as the 2022 Kona and Santa Cruz.

Symptoms of a Hyundai CVT transmission failure include:

  • Dashboard warning lights, including the Check Engine Light.
  • Transmission warning light.
  • Loud howling or buzzing noise while driving.
  • Reduced fuel efficiency or increased fuel consumption
  • Difficulty maintaining a constant speed or acceleration

It is important to note that some of these symptoms can also be caused by other mechanical problems, so it is important to have the vehicle diagnosed by a qualified Hyundai technician to determine the cause.

Hyundai Transmission Troubleshooting

If your Hyundai's transmission won't shift, stalls, or gets stuck in 2nd or 3rd gear, there are a few basic things you can check for yourself. First check if there are anyopen withdrawalsexist for your Hyundai that apply to the gearbox. Let's see what you can do to fix the problems with a Hyundai gearbox.

Get stuck on Drive, don't go back to Park.

Hyundai gearbox problems (1)

Hyundai transmissions are common problems with the shifter sticking up and not going back into park. Try this workaround:

  1. Apply the emergency brakes.
  2. Move the shift lever to neutral.
  3. Hold down the brake pedal, and then turn the ignition off.
  4. Turn the ignition back on.
  5. Switch to Park.
  6. Turn off the engine and remove the key.

This problem can be caused by a faulty brake switch, a faulty ignition interlock module, or a faulty gear selector on top of the transmission. If the above instructions don't work, manually replace the shifter to place it in Park.

Check gear oil level

Hyundai gearbox problems (2)

Low transmission fluid level is the most common problem that causes erratic shifting and no shifting in Hyundai vehicles. Checking the transmission oil in a Hyundai with a transmission oil dipstick is very easy.


  1. Park the vehicle on level ground.
  2. Apply the parking brakes.
  3. Start the engine and move the shifter between gears while parked.
  4. Turn off the engine and open the hood.
  5. Locate the transmission dipstick (not the engine oil dipstick).
  6. Remove and clean with a lint-free cloth.
  7. Reinstall and remove the dipstick and read the transmission oil level.
  8. When the level is within the recommended cold range, drive the vehicle for twenty minutes.
  9. Repeat the process to check the gear oil level if the gear oil is hot.

Only add the recommended Hyundai automatic transmission fluid when the level is low. Consult the user manual. Do not fill above the MAX mark on the dipstick.

If your Hyundai does not have a dipstick, you can check the level by removing the plug on the side of the gearbox.

Check gear range switch

Hyundai gearbox problems (3)

The gear selector is mounted on top of the gearbox. This switch is connected to the car's gear stick, allowing you to select a gear, drive, reverse, and park. The gear selector itself can rust, or the cable that connects it to the gear lever can also rust.

When that happens, it's hard to shift gears or park the car. Check the gear selection range. Spraying penetrating oil will get you back in the park. Be careful not to spray it on the electrical connector next to it. Also, the cable may need to be adjusted.

Read Diagnostic Trouble Codes

Hyundai gearbox problems (4)

The next step is to read the Transmission Control Module (TCM) Diagnostic Trouble Codes (DTCs) with aOBD-II Transmission Scanner.

oYOUCANIC Full System Testercan read and eraseerror codesthrough the control module of each vehicle.

  1. Locate the diagnostic connector under the dash.
  2. connect yoursScannerand turn it on.
  3. Turn on the ignition but do not start the engine.
  4. Select Hyundai from the main menu.
  5. Select Controllers > Stream.
  6. Scroll down and select Readerror codes.

The procedure is similar to reading Check Engine Light Codes. Use a Hyundai gearboxScannerto get precisionerror codesand descriptions.

A generic code reader can be useful, but is not recommended, as it only displayserror codessuch as P0700, P0705 and P0740. readingerror codesof the transmission module you will better understand why your Hyundai transmission is not shifting.

You can also view live sensor data from the transmission control module, including input and output sensor data, shifter position, and more.

Should I use a transition correction additive?

Hyundai gearbox problems (5)

Many readers ask if they should use a transmission additive to fix shifting problems. Before trying additives, we strongly recommend that you have your Hyundai transmission diagnosed by a professional auto mechanic or Hyundai dealer. If your transition failed and requires a rebuild or recovery, you can try a stream fix like Bars Leaks stream fix or Lucas stream fix.

Transmission additives can help reduce friction, wear, and heat within the transmission, which can improve overall performance and extend transmission life. However, it is important to note that transmission additives should not be used as a substitute for regular maintenance and repairs. Gear add-ons can help with certain issues, such as: B. preventing or reducing vibration or slippage, but they don't resolve serious drivetrain issues, such as. B. Worn or damaged internal components, low fluid levels, or problems with the transmission control module.

There is no guarantee that they will fix your transmission. Transmission additives cannot fix internal mechanical problems. If you see an improvement, don't expect gear correction additives to be a long-term solution.

Troubleshooting by symptoms

Hyundai gearbox problems (6)

Slipping when changing gear or delay in reverse gear engagement

Older Hyundai cars with an A4CF 4-speed automatic transmission suffer from a fairly common problem with gear changes. Noticeable slippage occurs when shifting between 2nd, 3rd, and 4th gear.

Other problems, including shifting into reverse, can be delayed and followed by a thud. These symptoms may be more pronounced in the cold. There may be a Check Engine Light and corresponding codes in the DTC memory.

Possible causes

  • This problem is usually caused by leaking solenoids in the valve body. This is a gradual process that only starts with the common cold and gets worse over time. The only solution is to replace the entire solenoid assembly with new or upgraded ones.
  • If the problem is intermittent and followed by a Check Engine Light with codes related to the solenoid, then the problem is likely caused by the faulty transmission wiring harness. If the wiring harness is damaged, it is likely that the solenoids are not the source of the problem.

Sudden change to neutral or erratic change

Vehicles with a four-speed automatic transmission may suddenly shift into neutral while driving or idling. Even when the shifter is in gear, it refuses to change gear. In some cases, gear changes will be very erratic. The onboard diagnostic system memory may have a Check Engine Light anderror codes.

Possible causes

  • In most cases, this problem lies with the input or output sensors of the transmission, which may be having problems. In some cases this will activate codes related to the solenoid. Replacing them in pairs, a simple task, is the only reliable way to fix this problem.

Shift flicker and delayed gear changes

Hyundai vehicles with the Aisin AW TF 80 6-speed automatic transmission found in models such as the 2006-2014 Hyundai Veracruz may experience issues with gear changes when accelerating and decelerating when downshifting and stopping. Initially, the problem only occurs when it's cold and you accelerate slowly, but it gets worse over time. In most cases, there are no other symptoms.

Possible causes

  • For any high mileage car, check the service history first. Since this transmission is considered "sealed for life", there is a possibility that the transmission oil has never been changed. If necessary, perform a thorough cleaning with approved gear oil only.
  • Use a suitable diagnostic tool, reset the gearbox adaptation values ​​and install the latest software version.
  • If the problem persists after performing the steps above, the cause is worn holes in the valve body. This causes transmission oil to leak around the magnetic pistons, causing shifting problems. Replacing the entire valve body is the only solution, but many specialty stores will sell remanufactured parts as this is a known issue.

burning smell

Hyundai vehicles with 4-speed and 6-speed automatic transmissions can produce a strong smell of burning oil in some situations. In most cases, this will be accompanied by a "transmission overheat" warning. The burning smell usually only occurs when towing a heavy trailer or on long, steep climbs. There are no other symptoms and the vehicle resumes normal operation after it cools down.

Possible causes

  • Since this is a sign of overheating in the transmission oil, check its level and condition. If necessary, complete or perform a transmission oil flush.
  • If fluid change is neglected, there may be sludge in the transmission oil cooler. Perform a transmission oil flush; Replace the cooler if that doesn't help.

No acceleration or very slow acceleration

Sudden and intermittent loss of steering can occur on Hyundai vehicles equipped with a seven-speed Dual Clutch Transmission (7DCT). Although the transmission is in drive mode and the engine is running, the vehicle does not accelerate.

In most cases, this happens after a short stop with the engine running, such as B. Waiting for a red light or similar. There will be no Check Engine Light or other obvious symptoms.

Possible causes

  • This is a known issue that affects several cars and SUVs sold in the US, including the Hyundai Sonata, Veloster, i30, Tucson, Ioniq, and Venue.
  • This issue is a software bug that can cause the transfer to "freeze." Reprogramming the transmission control unit with updated software fixes the problem. A factory recall covered this issue, so check to see if your vehicle applies.

Shaking when accelerating hard or changing gears

Models with dual-clutch transmissions can develop a number of problems when accelerating. Symptoms can range from delayed reactions, tremors and shuddering when pulling out of a stop, to sudden changes. Most of these symptoms are more pronounced when the driving style is more aggressive.

Possible causes

  • These transmissions use a dual mass flywheel that can wear and develop excessive backlash. This causes a metallic noise at idle. Check the condition of the flywheel and replace it if there is movement between the two chainrings.
  • A worn double clutch assembly as a result of normal wear and tear. While repair kits allow for partial repairs, replacing the entire clutch assembly is usually the best solution.
  • Response delays can be caused by overheating of the clutch pack sticking to the flywheel surface. This can happen due to aggressive driving style or outdated software. Update to the latest transmission control software using a suitable diagnostic tool.
  • Defective or worn engine or transmission mounts. This allows excessive movement, causing the engine and transmission to jump when backing up from a standstill.


Hyundai has announced the recall of 53,142 model years of 2021 and 2022 cars and SUVs equipped with an eight-speed dual-clutch automatic transmission. The recall was issued due to concerns that a malfunction in the transmission oil pump could trigger an incorrect response in safe mode, which could cause the transmission to disengage. This recall highlights the importance of regular maintenance and the use of the correct transmission fluid to ensure powertrain longevity and reliability, as well as being aware of any recalls that may affect your vehicle.

Letters notifying vehicle owners of the recall were sent on December 5, 2022. If you have any questions or concerns, please contact Hyundai Customer Service at 1-855-371-9460.


If you have problems with the gearbox of your Hyundai, e.g. B. Tough shifts, stuck shifts or no shifts at all, don't panic. This guide covers problems affecting Hyundai transmissions, common symptoms, possible solutions, and how to read transmission codes yourself. Hyundai cars, trucks and SUVs can experience transmission problems, especially if they are not serviced.

If you are having Hyundai transmission problems, first check the transmission oil level. Make sure there are no transmission related recalls pending for your vehicle. Then read theerror codestogetherEscaner Hyundai OBD IIand check the gear selector switch.

Have an ASE-certified mechanic or Hyundai dealer fix your vehicle if you can't fix the Hyundai transmission yourself. The typical diagnostic fee ranges from $130 to $200. Only use transmission repair additives as a last resort, and remember that even if it fixes your Hyundai transmission, it's likely a temporary fix.

Transmission problems are common among all car manufacturers. In the early days, Hyundai had higher than normal failure rates. The latest models of Hyundai cars have improved significantly over the years. Current models are also made by Honda and Toyota.

frequent questions

How reliable are Hyundai transmissions?

Based on research and preference of Hyundai users, Hyundai transmissions are reliable, especially the CVT, the most reliable on the market today.

How much does a Hyundai gearbox repair cost?

A Hyundai transmission can cost between $3,000 and $7,000 to rebuild or replace. At the same time, minor transmission repairs can cost anywhere from $100 to $600, depending on the parts that need to be replaced or repaired, plus labor.

How do I know if I have a faulty Hyundai gearbox?

Transmission won't shift or engage
Check engine light comes on
Hyundai does not move when Gear/Drive is engaged.
Erratic change when cold
Transmission is stuck in Gear/Limp Home mode.
The transmission is stuck in the park.
Vehicle speed is limited to 30 mph.
Transmission between 1st-2nd-3rd team when it's cold

We hope you found the Hyundai Transmission Troubleshooting Guide helpful. check theseTroubleshooting and repair guidesfor more help on your Hyundai.

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