Bad Transmission: Repair or Junk the Car?

These are common patterns, not a diagnosis. A mechanic needs to test the car, but this helps you follow what you are told.

• What tests did you run, and what did each one show?
• Have you scanned the transmission computer, and can I see the codes?
• What did the fluid look and smell like? Was there metal or debris in the pan?
• Could a solenoid, valve body, sensor, cooler line or software update fix it? Have you ruled them out?
• On a manual: is it the clutch, or the transmission itself?
• Is it safe to drive to another shop, or should it be towed?

Be careful about a simple fluid change as a cure-all. It may help in some cases and do little in others, especially if wear has already happened, so ask whether it fits what the shop found. And if the car jumps gears, slips in traffic or will not go when you need it to, do not drive it around while you decide. Losing power when pulling into a busy road is dangerous.

• Used transmission

  Taken from another vehicle. Ask about the mileage, how it was tested and what the warranty covers, including labor.

• Rebuilt by a local shop

  The transmission is opened and worn parts are replaced. Ask what is included and who stands behind the work.

• Remanufactured unit

  Built to a set standard by a dedicated company. Ask about the written warranty and how it works if you move.

• Sell it as it is

  A car with a bad transmission still has value. Get an offer to compare with the quotes.

Some newer designs, including many continuously variable transmissions, may be replaced as a whole unit more often than rebuilt. Ask your shop what is realistic for your exact model. Also ask whether the torque converter, cooler and lines are included. Debris from the old unit can harm the new one if they are not dealt with.

Repair makes good sense when the shop finds a smaller, confirmed fix like a leak, a sensor or a solenoid. A full replacement can also be the right call when:

• The engine runs strong and does not burn much oil or overheat.
• The body, brakes and suspension are in decent shape.
• You can get a written warranty that includes parts and labor.
• Repair adds more value than the job costs. See how to find the car’s value.
• A replacement car you could afford would come with just as many unknowns.

• The engine has problems of its own, such as burning oil or overheating.
• The car has serious rust or needs brakes, tires and suspension work on top of this.
• The quote is far above the value the repair would add, and the shop cannot find a smaller fix.
• This is the third big repair in a short time. Look at our signs it is time to stop.
• The only option available has little or no warranty.

If it can no longer shift safely, a private sale means a buyer who can tow it away. Tell them what the shop found. Or sell it to a junk car buyer. We pick up cars that do not run, or will not go into gear, on a flatbed at no charge, from a driveway, a street or a lot. If the car is stuck in park and cannot be moved, mention that when you call so the driver comes prepared.

If the car is at a shop, see our guide to selling from a repair shop. Have your title or other paperwork ready, and read our paperwork guide for what we need.