FAQs

Problems with R50 MINI ONE gearbox

Is there a known problem with the R50 MINI ONE and Cooper Gearbox?

The first-generation MINI ONE and Cooper (chassis code R50, produced between 2001 and 2006) is an iconic, fun-to-drive car — but it’s not without issues. One of the most common problem areas is the gearbox, particularly with early failure rates across all types: Manual Midland, Manual Getrag, and the CVT Automatic.

Here is a breakdown of each of the R50 gearboxes and their issues:

Midland Gearbox (GS5 65BH)

Bearing failure: Causes whining/rumbling noises and eventually internal damage
Cracked clutch fork/arm: Leads to loss of clutch control and gear engagement
Low oil levels: Can starve 5th gear, leading to damage

Midland Gearbox (GS5 65BH)

Bearing failure: Causes whining/rumbling noises and eventually internal damage
Cracked clutch fork/arm: Leads to loss of clutch control and gear engagement
Low oil levels: Can starve 5th gear, leading to damage

Getrag Gearbox (GS5 52BG)

Bearing failure: Similar to Midland — results in whining, gear damage, and housing failure
Loose differential housing bolts: Can lead to full diff failure
Worn planetary gears: Found within the differential over time
Low oil levels: Causes overheating and gear damage
Corroded gear selector pivot: Leads to stiff or inaccurate gear selectio

CVT Automatic Gearbox (GACVT16Z)

The CVT automatic is known for its poor reliability compared to traditional automatic transmissions.

Erratic shifting: Often caused by internal valve body faults
Electrical problems: May originate from the Transmission Control Module (TCM) or ECU
“Lifetime” oil myth: MINI claimed no service was needed, but regular fluid changes are essential

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