Toyota Yaris Mk2 1.3 VVT-i 87bhp — MMT Semi-Automatic Gearbox Actuator Failure
Models fitted with the Multi-Mode Transmission (MMT) — an automated manual — suffer from severe actuator wear, causing the car to drop into neutral while driving.
Severity
CriticalDIY Difficulty
Professional Only
Est. Cost
£500–£1500
OBD Codes
P0810P0900Gearbox
Typical layout and location for the Gearbox assembly.
Symptoms
- Flashing 'N' on the dashboard
- Car suddenly loses drive and revs freely
- Extremely jerky gear changes, especially 1st to 2nd
- Burning clutch smell
Root Cause
The electric clutch actuator motors burn out, and the internal sensors fail. The ECU gets confused about clutch position. The physical clutch also wears out very quickly in urban driving.
How To Fix
- Buy a manual Yaris if possible!
- If MMT: Try an ECU relearn/calibration via Toyota Techstream software first (£50-100)
- If actuator is dead, replacement is £600-900.
- If clutch is worn, replacement is £500-700.
Estimated Repair Costs
| Repair Option | Est. Cost (GBP) |
|---|---|
| DIY (parts only) | £200–£600 |
| Independent Garage | £500–£1500 |
| Main Dealership | £800–£2400 |
Other Faults on This Variant
Water Pump Leak and Bearing Failure
ModerateWhile incredibly reliable, the 1.3 VVT-i engine's most common weak point is the water pump, which develops a leak and noisy bearing.
Air Conditioning Condenser Leak (Stone Damage)
MinorThe air conditioning condenser is mounted at the very front of the cooling pack, making it highly susceptible to stone damage from the road, leading to refrigerant loss.
Front Anti-Roll Bar Drop Link Wear
MinorThe front anti-roll bar drop links wear out on heavily potholed UK roads, causing an annoying knocking sound at low speeds.
Disclaimer: Repair cost estimates are indicative and based on community data. Always get a quote from a qualified mechanic before proceeding with any repair.