A torque converter is an essential part of an automatic transmission. Simply put, this device takes torque created by the engine and converts it into hydraulic pressure for gear shifting.
If your car’s torque converter starts behaving strangely, you’ll want to address it swiftly to avoid further complications.
What are the symptoms of a faulty torque converter? These are the seven most common signs reported by drivers:
- Transmission slip
- Rough engine idle
- Sluggish acceleration
- Transmission doesn’t shift
- Odd shifting sounds
- Transmission fluid leak
- Dashboard warning light
How much does it cost to fix a torque converter? Depending on components and labor, repair/replacement costs range from about $500 to over $1,500 at a shop. In many cases, it’s advisable to replace a faulty torque converter rather than attempt a repair.
This guide will examine the above symptoms and costs in greater depth. We will also review what causes torque converter failure and what can happen if you ignore the issue and continue driving.
Want to learn more about how torque converters work? Check out this clear visual explanation by Lesics, a renowned YouTube engineering channel.
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7 Symptoms Of A Bad Torque Converter
1. Transmission Slip
The most prevalent sign of a torque converter issue is transmission slip, a topic we’ve covered extensively in another guide.
A slipping transmission will randomly “slip” out of gear, resulting in shifts often described by drivers as sluggish, lethargic, and harsh.
2. Rough Engine Idle
A sound vehicle will feel smooth when idling, with RPMs remaining mostly steady. However, torque converter problems can cause a rough idle.
RPMs will rise and fall erratically, leading to shaking and trembling throughout the car. You may also hear strange slipping/skipping sounds.
3. Sluggish Acceleration
Pressing on the gas pedal should result in a constant speed increase, with RPMs rising and falling consistently between gear shifts.
An issue with the torque converter can cause lethargic, rough acceleration. Shifts can occur randomly, and the transmission may hesitate, upping the odds of an accident.
4. Transmission Doesn’t Shift
Depending on how far the problem has progressed, a defective torque converter can also lead to the transmission not shifting at all.
You may be able to move from Park to Drive, and RPMs will still increase, but the gears won’t secure into place.
5. Odd Shifting Sounds
Automatic transmissions shouldn’t make much noise when shifting gears. Yet, if your car’s torque converter is failing, you’ll likely hear strange sounds.
Drivers mention noises like clanging or thumping during gear shifts. You may also experience humming, trembling, or rattling sounds when accelerating.
6. Transmission Fluid Leak
Torque converters are filled with automatic transmission fluid (ATF) and require it to operate. With this in mind, if an ATF leak develops, you’ll want to address it promptly.
Many ATF brands are tinted for easy identification. Seek out a deep crimson pool of fluid beneath the center/front of your car.
7. Dashboard Warning Light
A dash indicator may also appear if your torque converter is experiencing difficulties. Specifically, cars equipped with ATF temperature sensors may display a warning light if things get too hot.
A dependable gearbox should measure roughly 175 degrees Fahrenheit. Overheating starts at 200 degrees, when the ATF begins breaking down.
What Causes Torque Converter Failure?
The most common causes of failure include worn bearings, damaged seals, and a faulty clutch solenoid or plate. A functioning torque converter clutch is crucial, as that’s what mechanically engages/disengages the transmission from the engine.
No matter the exact cause, the unit must be disassembled to perform a time-consuming repair. For this reason, it’s often best to simply replace a defective torque converter.
How Much Does Torque Converter Replacement Cost?
How much does a torque converter cost? Most shops charge for five to 10 hours for replacement at an hourly rate of $75 to $130. Expect to spend between $150 and $350 on the actual component itself.
Using these figures, the total cost to replace a torque converter ranges from $525 to $1,650. Sites like RepairPal, ItStillRuns, and more confirm comparable ranges. Surprisingly, discussions on several Reddit automotive threads reveal owners have even paid over $2,500.
Regardless, converter replacement costs far less than swapping out the gearbox, which usually runs at least $5,000. To ensure the issue doesn’t progress to this point, you should swiftly address any signs of a faulty torque converter.
Can You Drive With A Bad Torque Converter?
Yes, it is possible to drive with a defective torque converter. However, the unit will eventually fail, resulting in the transmission no longer being able to shift gears.
Moreover, driving with a faulty converter can harm the engine and gearbox, which are both far costlier to repair.
Protect Against Torque Converter Failure By Following A Routine Maintenance Schedule
Following a consistent service schedule is the best way to extend the life of your torque converter, not to mention the rest of the vehicle.
Automakers typically suggest examining ATF levels every three months/3,000 miles and replacing the fluid and filter every two years/24,000 miles.
Check out our comprehensive car maintenance schedule guide for more details about regular service.
