Subaru Legacy: Lineartronic CVT Judder Under Light Throttle

The TR690 Lineartronic CVT fitted to FB25 and FB20 Legacy models develops a characteristic judder or shudder under light, steady-state throttle at moderate speeds (roughly 40–80 km/h). Subaru issued TSB 16-98-17R covering this pattern. The judder is caused by torque converter lockup clutch stick-slip and degraded CVT fluid losing its friction-modifier properties. Early intervention with a Subaru-specified Lineartronic fluid flush resolves most cases; delay leads to accelerated wear of the belt/pulley assembly and eventual CVT failure requiring full unit replacement.

• Rhythmic shudder or vibration under light, steady throttle at 40–80 km/h
• Vibration disappears under full throttle or engine braking
• Judder worsens when CVT is at operating temperature
• Shudder felt through the floor and seat rather than heard loudly
• Warning light absent in early stages — fault is mechanical, not always flagged by ECU

1. 1

   Test drive on a flat road at 60 km/h under light, steady throttle — feel for a rhythmic shudder or vibration transmitted through the drivetrain.

2. 2

   Check CVT fluid condition and service history (interval should be 40,000 km or less).

3. 3

   Ask for proof of fluid changes.

Parts involved: Torque converter, Clutch.

$250 to $9,500 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.

• “Has the CVT fluid been changed and how often — can you show service records?”
• “Has any dealer or workshop diagnosed a CVT shudder or performed a fluid flush under TSB 16-98-17R?”
• “Has the CVT ever been replaced or had any internal work done?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.