ERAD (Electric Rear Axle Drive) Failure
SeriousGearbox & TransmissionT8 plug-in hybrids are notorious for rear-motor failure, often caused by internal coolant ingress. Coolant leaks past the seals into the motor housing, leading to bearing failure or internal short circuits. In the UK, main dealer replacement of the ERAD unit is extremely costly (£5k-£9k).
Most affected: T8 Twin Engine, T8 Recharge
Typical symptoms
- •Whine or "marbles in a tin" grind from rear axle
- •AWD unavailable message
- •Reduced EV or hybrid performance
What to inspect before you buy
- ✓Drive in Pure and Hybrid modes
- ✓Listen for rear-axle noise during acceleration
- ✓Confirm if the car has received the latest ERAD coolant-drain or seal service campaigns