What are the most common BMW M4 problems?
According to Au7o's analysis of 940+ owner reports, the 2015 BMW M4 has 9 documented issues. The most frequently reported are: S55 Crank Hub Bolt Loosening, Rear Subframe Cracking From Track Use, S55 Crank Hub Failure (CATASTROPHIC) - F82/F83 M4. Of these, 4 are rated critical and should be addressed promptly.
Is the BMW M4 reliable?
The 2015 BMW M4 has 9 known issues documented across 940+ owner reports. 4 issues are rated critical: S55 Crank Hub Bolt Loosening and Rear Subframe Cracking From Track Use and S55 Crank Hub Failure (CATASTROPHIC) - F82/F83 M4 and S55 Rod Bearing Premature Wear - F82/F83 M4. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common BMW M4 problems?
Repair costs for known BMW M4 issues range from $150 to $8,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, S55 Crank Hub Bolt Loosening, typically costs $400-$1,200 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2015-2020 BMW M4 S55 Crank Hub Bolt Loosening?
The F82 M4 S55 twin-turbo engine is prone to crank hub bolt loosening, the most well-known S55 failure mode. The factory stretch bolt can back out under repeated thermal cycling and high-RPM use, causing the crank timing to shift and potentially destroying the engine. This is the… Repairs typically run $400-$1,200. Severity: high.
What is the 2015-2026 BMW M4 Rear Subframe Cracking From Track Use?
Both F82 and G82 M4 models can develop rear subframe cracks when subjected to aggressive track use, particularly with sticky tires and aggressive suspension setups. The subframe mounting points and cross-members can crack under the repeated high lateral and longitudinal loads exp… Repairs typically run $800-$4,000. Severity: high.
What is the 2015-2020 BMW M4 S55 Crank Hub Failure (CATASTROPHIC) - F82/F83 M4?
The S55 engine in F82/F83 M4 (2015-2020) suffers from catastrophic crank hub failures identical to the M3. The crank hub (harmonic balancer) is press-fit onto the crankshaft and can slip under high load, especially on tuned cars or during track use. When the hub slips, timing is… Repairs typically run $1,200-$2,500. Severity: high.
What is the 2015-2020 BMW M4 S55 Rod Bearing Premature Wear - F82/F83 M4?
The S55 engine has tight rod bearing clearances that can lead to premature bearing wear, especially with track use or aggressive driving. While not as severe as the S65 V10 rod bearing issue, the S55 still experiences accelerated wear. Symptoms typically appear after 60,000-80,00… Repairs typically run $3,000-$5,000. Severity: high.
What is the 2015-2020 BMW M4 Plastic Charge Pipe Blow-Off Under Boost?
The factory plastic charge pipe on the F82 M4 S55 engine is known to crack or blow off the intercooler under high boost, especially in hot weather or with any tune increasing boost pressure. The plastic material becomes brittle with heat cycling and eventually fails at the crimp… Repairs typically run $150-$500. Severity: medium.
What is the 2015-2020 BMW M4 Cooling System Inadequacy Under Track Use - F82/F83 M4?
The F82/F83 M4 has marginal cooling capacity for sustained track use. The S55 twin-turbo engine generates significant heat, and the stock cooling system struggles during extended track sessions. Oil temperatures commonly exceed 280°F, coolant temps spike, and the car experiences… Repairs typically run $3,000-$6,000. Severity: medium.
What is the 2015-2020 BMW M4 DCT Dual-Clutch Transmission Shudder & Clutch Wear - F82/F83 M4?
The Getrag DCT (dual-clutch transmission) in the M4 experiences clutch pack wear from aggressive driving, repeated launch control, and track use. The DCT has two clutches (odd and even gears) that wear over time. Symptoms include shuddering during low-speed acceleration, rough sh… Repairs typically run $5,000-$8,000. Severity: medium.
What is the 2015-2020 BMW M4 S55 High-Pressure Fuel Injector Failure - F82/F83 M4?
The S55 twin-turbo engine uses high-pressure direct injection fuel injectors that commonly fail between 60,000-100,000 miles. The injectors operate at extremely high pressures (2,900+ PSI) and are subject to carbon buildup and internal seal wear. Failed injectors cause rough runn… Repairs typically run $2,000-$3,500. Severity: medium.
What is the 2015-2020 BMW M4 Convertible Top Hydraulic Pump Failure - F83 M4 Convertible?
The F83 M4 convertible uses a complex hydraulic folding hardtop system that suffers from pump motor failures and hydraulic leaks. The hydraulic pump motor can burn out from overheating, and seals degrade over time, causing fluid leaks. Failed microswitches that detect top positio… Repairs typically run $1,500-$4,000. Severity: medium.
