Mitsubishi ASX: CVT Belt Slip & Torque Capacity Loss at High Mileage

The Jatco-sourced CVT fitted to 2WD ASX variants uses a steel push-belt running between variable-diameter drive and driven pulleys. Under sustained heavy load — steep grade climbing, full-throttle overtaking, or towing — the belt clamping force becomes insufficient as the primary and secondary pulley contact surfaces wear smooth at high mileage. This causes the belt to slip momentarily, producing a brief surge or flare in engine rpm without corresponding vehicle acceleration. Over time the belt itself degrades, and when CVT fluid has not been changed at manufacturer-specified intervals the fluid loses its critical friction modifier properties, dramatically accelerating pulley and belt wear. Full CVT unit replacement is expensive and often approaches or exceeds the residual value of a high-mileage ASX.

• Engine rpm flares upward without corresponding vehicle acceleration during hard throttle
• Drivetrain shudder or judder under strong acceleration from low speed
• Burnt or acrid smell from transmission area during or after heavy use
• CVT warning light or fault codes P0868 or P0840 stored
• Noticeably reduced acceleration response despite high engine revs
• Transmission temperature warning during sustained uphill driving

1. 1

   During the test drive apply full throttle from 40 km/h on an uphill section or motorway entry ramp and watch for rpm climbing without proportional vehicle speed increase.

2. 2

   Check CVT fluid condition via dipstick or fill plug — should be clean pink or red, not brown or acrid smelling.

3. 3

   Ask for documented CVT fluid change history (recommended every 40,000 to 60,000 km).

4. 4

   Scan for CVT-related fault codes.

5. 5

   At above 150,000 km treat any CVT as a significant risk item regardless of reported history.

Parts involved: CVT belt and pulleys.

≈A$640 to ≈A$5,980 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, 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 if so at what mileage and when?”
• “Has the vehicle ever hesitated, revved high without accelerating, or shuddered under hard acceleration?”
• “Are there any stored CVT fault codes or warning light appearances in the vehicle history?”
• “Has the transmission been inspected or serviced by a transmission specialist?”

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.