The F80 M4 with its S55 twin-turbo inline-six is a performance powerhouse, but early production engines suffer from catastrophic rod bearing failures and crank hub issues that can grenade motors without warning. Transmission cooling and driveline vibrations are also recurring headaches.
S55 Rod Bearing Failure (Early Production)
Occasional · high severity
Typical onset: 30,000-80,000 mi
Symptoms: Metallic knocking from engine bay, especially cold start or under load, Metal shavings in oil during analysis, Sudden catastrophic engine failure with no warning in worst cases
Fix: Early 2015-2016 S55 engines have undersized rod bearings that wear prematurely, especially with aggressive driving or track use. Fix requires engine-out service to replace all rod bearings (8-12 hours labor) if caught early. If spun bearing damages crank, you're looking at full engine rebuild or replacement. Preventive bearing replacement at 40k-60k miles is common among enthusiasts who track the car.
Estimated cost: $3,500-6,000 for bearings only, $15,000-25,000 for full engine rebuild or replacement
Crank Hub/Damper Failure
Occasional · high severity
Typical onset: 40,000-90,000 mi
Symptoms: Serpentine belt shredding repeatedly, Rough idle or vibration from front of engine, Accessory drive components misaligned, Catastrophic timing failure if hub separates completely
Fix: The factory crank hub can separate from the damper, causing the accessory belt system to fail and potentially jumping timing. Requires crank hub replacement with updated part or aftermarket solution (6-8 hours labor). Many owners proactively upgrade to aftermarket pinned hubs around 50k miles. BMW issued a TSB but no recall.
Estimated cost: $1,800-3,200 for hub replacement, preventive upgrade $800-1,500
DCT Transmission Oil Cooler Leaks
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Transmission fluid puddles under car, passenger side, Burnt smell after spirited driving, Transmission temperature warnings on iDrive, Harsh shifting when fluid level drops
Fix: The DCT transmission oil cooler develops leaks at seals or develops internal cracks. Replacement requires dropping transmission undertray and sometimes subframe (4-6 hours labor). Use only genuine BMW fluid during refill. Common enough that many shops stock the part.
Estimated cost: $1,200-2,200
Driveshaft Center Support Bearing Failure
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunking from underneath on acceleration or deceleration, Vibration at highway speeds, worsens under load, Rumbling noise that changes with vehicle speed
Fix: The two-piece driveshaft's center support bearing wears out, especially on cars driven hard or with aftermarket power. BMW issued recall 18V-637 for some VINs, but many fall outside recall scope. Requires driveshaft removal and bearing replacement or full driveshaft assembly (3-5 hours labor). Check if your VIN is covered under recall first.
Estimated cost: $800-1,600 if not recall-covered
Adaptive M Suspension Damper Failures
Occasional · low severity
Typical onset: 70,000-120,000 mi
Symptoms: Suspension warning light on iDrive, Loss of adaptive damping, stuck in one mode, Fluid leaking from shock body, Harsh ride or excessive body roll
Fix: Electronic dampers can fail internally or develop electrical faults. Replacement requires individual corner replacement (2-3 hours per corner). Aftermarket coilover swaps are common at this point since OEM dampers are expensive. Not safety-critical but diminishes the M4's handling character.
Estimated cost: $1,200-1,800 per damper OEM, $2,500-4,000 for quality aftermarket coilover set installed
Turbocharger Wastegate Rattle
Common · low severity
Typical onset: 40,000-80,000 mi
Symptoms: Rattling noise from engine bay at idle or light throttle, Sound disappears under boost or at high RPM, No performance loss or check engine light
Fix: Wastegate actuator arms develop play, creating an annoying rattle. Technically a nuisance issue with no performance impact, but dealers often replace turbos under warranty. Out of warranty, you can live with it or replace turbos (8-12 hours labor for both). Some owners report success with aftermarket wastegate arm kits at fraction of turbo replacement cost.
Estimated cost: $4,000-7,000 for both turbos, $500-800 for aftermarket arm fix
Owner tips
Do oil analysis every 5,000 miles to catch bearing wear early — this engine destroys itself with no warning
Inspect crank hub at every oil change after 40k miles; upgrade to pinned hub if tracking the car
Use only BMW-spec DCT fluid (Fuchs/Motul DCT-250) and change every 30k miles regardless of 'lifetime fill' claim
Budget $2,000-3,000 annually for maintenance if buying used — this is not a Camry
Check if VIN is covered under driveshaft recall 18V-637 before buying
Phenomenal driving experience, but early S55 engines are ticking time bombs — insist on proof of rod bearing service or walk away from 2015-2016 models unless priced accordingly.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: AGM required for start-stop system; battery located in trunk
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Every control module on the 2014-2017 BMW M4 — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Electric Power Steering (EPS)3.5 hr R&Rdealer / factory tool +1.0 hr▸ programming details
📍 Steering column, integrated with steering rack or column assembly
🔧 BMW ISTA/P
⚠️ Steering angle sensor calibration and adaptation mandatory. Alignment required after installation.
⚠️ Controls power seat functions and memory. Basic coding usually sufficient.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
BMW of North America, LLC (BMW) is recalling certain 2014-2015 2 Series Coupe (228i, 228i xDrive, M235i), 3 Series Sedan (320i, 320i xDrive, 328i, 328i xDrive, 335i, 335i xDrive, M3, 328d, 328d xDrive), 4 Series Coupe (428i, 428i xDrive, 435i, 435i xDrive, M4), and 2015 4 Series Gran Coupe (428i, 428i xDrive, 435i, 435i xDrive) vehicles. The head air bag inflator may fail at the weld joint, which can cause gas to leak from the inflator or result in an inflator rupture.
Consequence: An inflator that ruptures may cause sharp metal fragments to enter or exit the vehicle, increasing the risk of injury. Additionally, an inflator that leaks gas may only partially inflate during a crash, increasing the risk of injury.
Remedy: Dealers will replace the head air bags, free of charge. Owner notification letters were mailed November 4, 2024. Owners may contact BMW customer service at 1-800-525-7417.
STRUCTURE:FRAME AND MEMBERS · 16V653000
2016-09-09
BMW North America, LLC (BMW) is recalling certain model year 2016 BMW M2 Coupe vehicles, 2015-2017 M3 Sedan vehicles and 2015-2016 M4 Coupe and M4 Convertible vehicles. During servicing of the rear differential for a prior service action, the rear sub-frame bolts may have been reused instead of being replaced. Reuse of the existing bolts may cause the bolts to loosen.
Consequence: Loose rear sub-frame bolts may adversely affect vehicle handling and control, increasing the risk of a crash.
Remedy: BMW will notify owners, and dealers will replace the rear sub-frame bolts with new bolts, free of charge. The recall began on November 3, 2016. Owners may contact BMW customer service at 1-800-525-7417.
POWER TRAIN:DRIVELINE:DRIVESHAFT · 15V782000
2015-11-23
BMW of North America, LLC (BMW) is recalling certain model year 2015-2016 M3 Sedan vehicles manufactured May 30, 2015, to September 2, 2015, 2016 M4 Coupe vehicles manufactured July 3, 2015, to September 11, 2015, and 2015-2016 M4 Convertible vehicles manufactured May 29, 2015, to August 4, 2015. The affected vehicles have a driveshaft with a slip-joint that may not have been filled with grease. As a result, the slip-joint may fail over time.
Consequence: If the slip-joint fails, there would be a loss of power to the rear axle and therefore the vehicle would stop moving, increasing the risk of a crash.
Remedy: BMW will notify owners, and dealers will inspect the driveshaft, replacing it as necessary, free of charge. The recall began on January 14, 2016. Owners may contact BMW customer service at 1-800-525-7417.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2015 BMW M4 3.0L Twin-Turbo I6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.