Noticing unusual behavior from your transmission can be concerning, especially if it seems to be slipping as you drive. As such a crucial system in your vehicle, it’s important to know the issues that can occur in the gearbox, why they happen, and what steps you should take to keep your transmission operating as it should.
Signs of a Slipping Transmission
If your transmission is experiencing slipping, you may notice some of the following symptoms:
- Slow or jerky shifts
- Grinding or whining noises
- Inability to shift into reverse
- Burning smell
- Check-engine light
Low Transmission Fluid
Possibly the most common reason for a slipping transmission is low transmission fluid. This fluid is responsible for providing both lubrication and hydraulic pressure within the gearbox. When the fluid is able to exit the system through a leak, or becomes contaminated with debris and moisture, the gearbox will be unable to perform shifts properly.
Low volume of transmission fluid may also lead to overheating, as excess friction will cause heat to rapidly build up in the gearbox, potentially leading to internal components warping or cracking.
Worn Clutch Disc
In manual transmissions, the clutch discs are abrasive plates that control the transfer of power from the engine to the transmission. The clutch will disengage during shifting to interrupt the engine’s output and allow the gearbox to change gears. With gradual wear over time, the friction material on these plates will degrade, and may get to the point where it can’t create a solid connection.
When the clutch is unable to properly engage, it may cause the transmission to feel like it’s slipping, causing the engine speed to spike.
Worn or Damaged Transmission Bands
In automatic transmissions, metal bands help link the gears together. These bands can become worn or broken over time, especially if the transmission hasn’t been serviced regularly. When bands lose tension or integrity, the transmission may fail to stay in the correct gear, causing noticeable slipping or hesitation.
Failing Torque Converter
The torque converter is responsible for transferring power from the engine to the transmission fluid in automatic vehicles. If the torque converter is malfunctioning—due to worn needle bearings, damaged seals, or contaminated fluid—it can cause gear slippage, shuddering, or overheating. Diagnosing a torque converter issue typically requires a professional inspection.
Software or Sensor Issues
Modern transmissions rely heavily on electronic controls and sensors. A faulty speed sensor or transmission control module can send incorrect signals, causing the gearbox to shift erratically or at the wrong time. This can mimic the symptoms of slipping and should be diagnosed with a proper scan tool.
What to Do If Your Transmission Is Slipping
If you suspect your transmission is slipping, here are the immediate steps you should take:
- Check the transmission fluid level and condition. Look for a low level, dark color, or burnt smell.
- Avoid heavy driving or towing. Putting extra strain on a slipping transmission can accelerate damage.
- Schedule an inspection with a certified technician. A professional diagnostic will pinpoint the issue and recommend the best course of action.
Transmission Services at Scott’s U-Save
If you’re experiencing a slipping transmission, or any other transmission issue, don’t hesitate to schedule your appointment with the expert technicians at Scott’s U-Save. Letting gearbox issues linger can lead to more extensive damage and repairs down the line. Give us a call or schedule online today at any of our four locations in New Lenox, Steger, Schererville, and Crown Point.