Subaru Legacy: FB25 CVT Chain Wear — Slipping and Shudder

The BM/BR Legacy fitted with the FB25 naturally-aspirated engine and Subaru's Lineartronic CVT (TR690/TR580 variants) is subject to progressive wear of the push-belt/chain assembly and the primary/secondary pulley surfaces. Unlike a traditional torque-converter automatic, the CVT relies on metal-to-metal clamping force and any degradation in fluid condition or pulley surface finish causes micro-slippage. The driver experiences this as a shudder under light throttle at 40–80 km/h or a surging sensation at cruise. Advanced wear produces audible CVT whine and eventually full belt slip under load. Subaru issued revised CVT fluid specifications and extended the service interval warning on these units. Full CVT replacement is expensive; early fluid-change intervention can extend service life significantly.

• Shudder or vibration felt through the driveline under light throttle between 40 and 80 km/h
• Surging or hunting sensation at steady highway cruise speed
• High-pitched CVT whine increasing in pitch with road speed
• Delayed engagement or slipping when pulling away from a standstill under load

1. 1

   Test drive at 50–80 km/h with light throttle and feel for shudder or surging.

2. 2

   Check CVT fluid colour (should be clear pink/red — brown or burnt smell indicates degraded fluid).

3. 3

   Ask for CVT fluid change history: Subaru specifies ECVT fluid changes every 40,000 km in severe service.

4. 4

   Scan for CVT-related fault codes (P0868, P0869, P17XX series).

Parts involved: Torque converter, CVT belt and pulleys.

$4,500 to $9,000 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.

• “Has the CVT fluid ever been changed, and at what mileage?”
• “Has the car ever shown a CVT warning light or transmission-related fault code?”
• “Does the car shudder or surge when driving at 60 km/h with gentle throttle?”

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.