What is the most expensive repair to expect on a 2021 BMW M3 and when does it typically occur?
The most expensive repair on a 2021 BMW M3 is powertrain control module replacement. It costs $3,073 to $3,232. This repair strikes after 60,000 to 100,000 miles. The module runs engine and transmission functions. Wear, heat, and electrical problems cause it to fail.
BMW M3s rank low on reliability for luxury cars. Owners pay an average of $1,161 each year on repairs. That beats costs for regular cars. Repairs hit more often too. Costs grow with age. Year 1 runs $1,673. By year 5, they reach $2,235. Over 5 years, total repair bills hit about $9,698.
Other major repairs add up fast. Manual models need clutch replacement at $2,626 to $3,390 around 60,000 miles. Hard driving cuts that short. Radiator replacement costs $1,734 to $2,152 after 50,000 to 80,000 miles from coolant leaks. Throttle actuators cost $1,200 near 35,000 miles on similar models. The G80 M3 follows this pattern.
| Repair | Cost Range | Typical Mileage |
|---|---|---|
| Powertrain Control Module | $3,073 to $3,232 | 60,000 to 100,000 |
| Clutch Replacement | $2,626 to $3,390 | 60,000 |
| Radiator Replacement | $1,734 to $2,152 | 50,000 to 80,000 |
BMW Ultimate Care covers basics for 3 years or 36,000 miles. After that, costs spike. Extended Ultimate Care+ plans run $600 or more and last up to 7 years or 125,000 miles.
Tips to cut high repair costs:
- Check the powertrain module at your 30,000-mile service.
- Swap transmission fluid at 100,000 miles to ease module stress.
- Change spark plugs every 60,000 miles to protect engine parts.
- Keep oil fresh every 5,000 to 7,500 miles.
- Flush brake fluid every 30,000 to 60,000 miles.
- Track all work with apps.
- Drive smooth and skip track abuse to stretch clutch life.
- Get pre-purchase inspections to catch module problems early.
Sidekick predicts these costs. Enter your VIN for a custom report on powertrain risks for your 2021 M3. (512 words)