- Nissan CVT transmissionTransmission complaints for each Nissan model in its CVT years.
- Ford 10-speed transmissionSix Ford models before and after the 10-speed automatic.
- Used car checklistWhat to check on a used car, in order.
- How many miles is too manyThe mileage at which owners report problems.
What owners report most
Across the 818,830 system mentions in complaints for the models we track, these are the systems named most often. One complaint can name several systems.
How we measure a problem
A problem page starts from a question people actually search for, such as whether a certain transmission causes trouble, and answers it with counts rather than anecdotes. We take the complaints owners filed with NHTSA that name the system in question, match them to the model years where the EPA data file shows the part was fitted, and divide by U.S. sales whenever the automaker publishes them for that model. Comparing a model with its own earlier years, or with other models on the same scale, shows whether a problem is unusual or just common to every car.
Counts cannot replace a mechanic. They tell you where to look and which model years to research more closely; the condition of a particular vehicle, its service records and its open recalls decide the rest. Each page lists its sources and the date of the data, and the import repeats every month.
New problem pages follow the questions owners ask most often. Each one compares like with like: the same model before and after a change, or many models on one rate per 100,000 sold.
Complaint counts are reports filed by owners with NHTSA. NHTSA does not verify them, and a complaint does not prove a defect.