2015 BMW 640i Gran Coupe

The 2015 BMW 640i Gran Coupe is a stylish and luxurious four-door coupe known for its elegant design and comfortable ride. It was available with a few engine options, the most common being the 3.0-liter turbocharged inline-6 (N55) engine, which produced 315 horsepower and 330 lb-ft of torque. Other engine options included the 4.4-liter turbocharged V8 (N63) in the 650i model. Both engines were paired with an 8-speed automatic transmission. People appreciate the 640i Gran Coupe for its sleek aesthetics, comfortable and well-appointed interior, and balanced driving dynamics. Common complaints include higher maintenance costs associated with BMW vehicles and potential issues with some of the electronic features.

Engine

3.0L Turbocharged Inline-6 (N55)

• Oil Filter Housing Gasket Leak
  • Description/Symptoms: Oil leak from the oil filter housing, visible as oil drips or residue near the front of the engine. Can lead to low oil levels and potential engine damage if left unattended.
  • Solution: Replacement of the oil filter housing gasket.
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found
• VANOS Solenoid Failure
  • Description/Symptoms: Rough idling, decreased engine performance, and potential check engine light with VANOS-related codes.
  • Solution: Replacement of the faulty VANOS solenoid(s).
  • Estimated Cost to Fix: $200 - $400
  • Recalls: None Found
• Coolant Leaks (Expansion Tank, Hoses)
  • Description/Symptoms: Loss of coolant, overheating, visible coolant leaks. Commonly occurs at the expansion tank or radiator hoses.
  • Solution: Replacement of the leaking coolant expansion tank and/or radiator hoses.
  • Estimated Cost to Fix: $200 - $500
  • Recalls: None Found

4.4L Turbocharged V8 (N63)

• Valve Stem Seal Leaks
  • Description/Symptoms: Excessive oil consumption, blue smoke from the exhaust, especially during start-up.
  • Solution: Valve stem seal replacement (a more extensive repair).
  • Estimated Cost to Fix: $3,000+
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: Reduced power, whistling noises from the engine, potential turbocharger failure.
  • Solution: Turbocharger repair or replacement.
  • Estimated Cost to Fix: $2,000 - $5,000+
  • Recalls: None Found
• Coolant Leaks (Coolant Transfer Pipe)
  • Description/Symptoms: Loss of coolant, overheating, difficult to detect coolant leaks. This coolant pipe is located under the intake manifold in the V of the engine making it difficult to reach.
  • Solution: Replacement of the coolant transfer pipe.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found

Transmission

8-Speed Automatic (GA8HP)

• Mechatronic Sleeve Leak
  • Description/Symptoms: Transmission fluid leak from the mechatronic unit sleeve, leading to potential transmission issues.
  • Solution: Replacement of the mechatronic sleeve.
  • Estimated Cost to Fix: $300 - $600
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: Harsh or delayed shifting, transmission slipping.
  • Solution: Valve body repair or replacement.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found

Suspension

• Air Suspension Compressor Failure (if equipped)
  • Description/Symptoms: Vehicle sitting unevenly, air suspension malfunction warning lights, noisy compressor.
  • Solution: Replacement of the air suspension compressor.
  • Estimated Cost to Fix: $800 - $1,500
  • Recalls: None Found
• Control Arm Bushing Wear
  • Description/Symptoms: Clunking noises from the front suspension, especially over bumps, imprecise steering.
  • Solution: Replacement of the worn control arm bushings or complete control arms.
  • Estimated Cost to Fix: $300 - $800 per control arm
  • Recalls: None Found

Electrical

• iDrive System Malfunctions
  • Description/Symptoms: Freezing, rebooting, or unresponsive iDrive screen.
  • Solution: Software update, iDrive module replacement.
  • Estimated Cost to Fix: $500 - $2,000+
  • Recalls: None Found
• Battery Drain Issues
  • Description/Symptoms: Dead battery, slow starting, electrical malfunctions.
  • Solution: Diagnosis of parasitic drain, battery replacement.
  • Estimated Cost to Fix: $200 - $500
  • Recalls: None Found

Exterior

• Adaptive Headlight Malfunctions
  • Description/Symptoms: Error messages related to adaptive headlights, headlights not leveling or swiveling properly.
  • Solution: Headlight assembly repair or replacement.
  • Estimated Cost to Fix: $800 - $2,000+ per headlight
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, unusual noises when operating.
  • Solution: Sunroof track repair or replacement.
  • Estimated Cost to Fix: $500 - $1,500
  • Recalls: None Found
• Seat Motor Failure
  • Description/Symptoms: Seat not adjusting, seat motor noise.
  • Solution: Seat motor replacement.
  • Estimated Cost to Fix: $300-$700
  • Recalls: None Found

Summary

The 2015 BMW 640i Gran Coupe, while offering a luxurious driving experience, can be prone to certain issues. Engine-related problems, particularly oil leaks and coolant leaks, are common. Additionally, issues with the transmission, suspension, and electrical systems can arise, potentially leading to significant repair costs. The severity of these issues can range from minor inconveniences to major mechanical failures. Repair costs can vary widely, from a few hundred dollars for minor repairs to several thousand dollars for more complex issues such as turbocharger or valve stem seal replacement. Prospective buyers should have a pre-purchase inspection performed by a qualified mechanic specializing in BMWs to identify any existing or potential problems.