C30 Gearbox Slipping

I had a similar problem with my C30, though the symptoms were slightly different. Have you checked the transfer case oil level and fluid state? Worth checking before assuming the worst.

Thanks! Did your assessment point to defective gears? How was the issue resolved on your C30?

Mine resembled defective gears, but it was complex. Get a specialized workshop to replace the oil and check the gears. If that fixes it, you're lucky.

Appreciate the insight. My mechanic inspected the transfer case and confirmed the gears were the problem, as suspected. Total cost was around 330€.