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Subaru Legacy: Lineartronic CVT (TR690) torque converter shudder and valve body faults

Lineartronic CVT (TR690) torque converter shudder and valve body faults is a common transmission fault on the Subaru Legacy on the 2009–2020 cars, and we rate it major. Putting it right costs $1,500 to $8,000 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 54 documented faults on the Subaru Legacy.

Vehicle
Subaru Legacy
Years
2009–2020
Gearbox
cvt
System
Transmission

This page covers the Subaru Legacy as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Subaru Legacy faults54 documented faults on this model

What you are looking at

A cutaway automatic transmission torque converter showing the internal turbine and stator.Example of the part — not this vehicle

A torque converter, sectioned. The lock-up clutch inside is what shudders.

No machine-readable author provided. BerndB~commonswiki assumed (based on copyright claims). · CC BY-SA 3.0 · Wikimedia Commons

What goes wrong

The BM/BR Legacy debuted the Lineartronic CVT (TR690), and early units suffer torque converter thrust-washer debris and lock-up clutch shudder — Subaru had dealers replacing torque converters, and the company extended CVT warranty to 10yr/100k miles in the US for 2010-2015 Legacys. That coverage is long gone and never applied to NZ/JDM cars. BN/BS cars are better but still shudder when fluid is neglected. Fluid service helps early; torque converter, valve body or full CVT replacement is the escalation ladder.

What you would notice

  • Shudder at light throttle around 40-60 km/h
  • Judder pulling away
  • Whine that tracks road speed
  • AT Oil Temp light flashing
  • Clunk when selecting drive/reverse

How to check it

Where to look. Transmission — shudder felt through the floor at low speed

  1. Test drive with sustained light throttle at 50 km/h and repeated gentle take-offs, uphill if possible.

  2. Check for a flashing AT Oil Temp light on start-up.

  3. Ask when the CVT fluid was changed and by whom — 'never, it's sealed for life' on a 150,000 km car is a bad answer.

  4. Get any hesitation scanned before purchase.

Parts involved: Torque converter, Mechatronic / valve body.

What it costs to put right

$1,500 to $8,000 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the CVT fluid been serviced?”
  • “Torque converter or valve body ever replaced?”
  • “Any warranty CVT work done overseas?”

Now check the Subaru Legacy you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in the sources below. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them.

  • Subaru (torque converter)
  • Subaru US extended CVT warranty (2010-15 Legacy)
  • Gears Magazine TR690 torque converter article
  • subaruoutback.org CVT valve body/torque converter threads

Subaru Legacy buyer questions

Is lineartronic cvt (tr690) torque converter shudder and valve body faults serious on a Subaru Legacy?

We rate it major and common on the Subaru Legacy. The BM/BR Legacy debuted the Lineartronic CVT (TR690), and early units suffer torque converter thrust-washer debris and lock-up clutch shudder — Subaru had dealers replacing torque converters, and the company extended CVT warranty to 10yr/100k miles in the US for 2010-2015 Legacys. That coverage is long gone and never applied to NZ/JDM cars. BN/BS cars are better but still shudder when fluid is neglected. Fluid service helps early; torque converter, valve body or full CVT replacement is the escalation ladder.

How much does it cost to fix on a Subaru Legacy?

$1,500 to $8,000 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Subaru Legacy years are affected?

Our research records this fault on the 2009–2020 Subaru Legacy. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

Test drive with sustained light throttle at 50 km/h and repeated gentle take-offs, uphill if possible. Check for a flashing AT Oil Temp light on start-up. Ask when the CVT fluid was changed and by whom — 'never, it's sealed for life' on a 150,000 km car is a bad answer. Get any hesitation scanned before purchase. Look here: Transmission — shudder felt through the floor at low speed