Transmission problems explained: shudder, harsh shifts, CVTs and what to test on a drive
How the main automatic transmission types fail, the symptoms owner complaints describe for each, and a practical test-drive checklist.
Transmission and powertrain complaints are one of the largest categories in this index, and a transmission repair can cost more than an older car is worth. A careful test drive can reveal some of these problems, but not all: many faults are intermittent, or appear only when the transmission is hot or after more miles, so a drive that feels fine does not rule them out. This article covers the four common automatic designs, how each one fails, and what the owner reports say.
Four designs, four failure patterns
Conventional automatics with a torque converter
Still the most common design in trucks, SUVs and larger cars, now with eight, nine or ten speeds. The torque converter contains a lock-up clutch that engages at cruising speed to save fuel. When that clutch slips or engages roughly, owners feel a vibration at a steady speed that feels like driving over rumble strips. Owners call it "shudder". Degraded fluid is a common cause and a fluid exchange sometimes fixes it; when it does not, the converter or the valve body is replaced. Another complaint with many-speed automatics concerns calibration: hunting between gears, harsh downshifts, a delay or a clunk when moving from park into drive. Software updates address some of these; others are mechanical.
Continuously variable transmissions
A CVT uses a steel belt or chain between two variable pulleys instead of fixed gears, and it is widely used in compact cars and small SUVs, especially from several Japanese brands. Owner complaints describe a whine or drone that rises with speed, a hesitation or "rubber band" surge when accelerating from a stop, and overheating on long climbs or in hot weather, sometimes with a warning message that limits power.
Dual-clutch transmissions
Essentially two automated manual gearboxes sharing a housing, one for odd gears and one for even. Some dry-clutch versions in small cars drew widespread complaints of judder and hesitation at parking speeds, unpredictable creep in traffic, and clutch wear within the warranty period. Owner reports mention low-speed lurching, a delay when pulling out into traffic, and a warning to stop the vehicle when the clutch overheats.
Hybrid and electric drive units
Power-split hybrids have no conventional gearbox, so the shift problems described above do not apply to them. Electric vehicles have a single-speed reduction gear, but their reports do include driveline noise, differential and axle faults and software behaviour that owners file under powertrain: unexpected loss of power, limp mode, or a car that will not shift into drive.
What owners report
Reports of a car that "would not move" or "lost power on the highway" are the most safety-relevant, because a loss of drive in traffic can lead to a crash. Several models in this index have recalls or investigations involving a loss of motive power, and at least one investigation concerns repeated failures of a transmission shift interlock after a recall repair. The live table below shows where the complaints are concentrated this month.
What the data shows now · 2026-10-13
Share across all tracked vehicles: 11.7% · Tracked models with at least 100 complaints, ranked by the share of their complaints in this area.
| Models | Complaints · Transmission / powertrain | Share of complaints | vs. all vehicles | Recent activity |
|---|---|---|---|---|
| Jeep Cherokee | 1,241 | 42.7% | 3.65 | Within ±30% year on year |
| Ford Expedition | 661 | 35.6% | 3.05 | Within ±30% year on year |
| Ford F-150 | 2,104 | 34.1% | 2.92 | Within ±30% year on year |
| Ford Ranger | 242 | 33.9% | 2.9 | Rising |
| Ford Edge | 719 | 32.0% | 2.74 | Within ±30% year on year |
| Toyota Highlander | 651 | 30.1% | 2.58 | Rising |
| Chevrolet Traverse | 463 | 26.6% | 2.28 | Within ±30% year on year |
| Ford F-150 Lightning | 131 | 23.8% | 2.03 | Within ±30% year on year |
A test-drive checklist
- Cold start. Some transmission faults show up mainly when the unit is cold. Ask the seller not to warm the car up before you arrive.
- Park to reverse to drive. Do this with your foot on the brake and count. More than a one-second delay, or a clunk, is worth a question.
- Creep in traffic. Roll forward at walking pace and stop several times, and note any lurching, judder or vibration.
- Light throttle at 30 to 45 mph. Hold a steady speed on a flat road. A rumble-strip vibration is a typical sign of converter shudder.
- Hard acceleration and a merge. Listen for flare (revs rising without speed) and feel for a delayed downshift.
- A long hill if you can find one. CVT overheating can show up here, sometimes with a warning message.
- Check the fluid record. Ask when the transmission fluid was last changed. If the answer for a high-mileage CVT is "never", compare that with the manufacturer's maintenance schedule and weigh it in your decision.
Repair, warranty and what to expect
Some manufacturers have extended transmission warranty coverage on particular models after widespread problems, and have reprogrammed control modules at no charge under service campaigns. Before paying for a repair, ask the dealer to check for open campaigns and technical bulletins by VIN, and check the NHTSA recall lookup yourself. If the vehicle lost drive or shifted unexpectedly on the road, file a complaint: those reports are the raw material of recalls, and the excerpts on this site show how many owners have already done so.