2020 BMW 840i Gran Coupe

The 2020 BMW 840i Gran Coupe is a stylish and luxurious four-door coupe offering a blend of performance and comfort. The 840i Gran Coupe primarily came with a 3.0-liter turbocharged inline-6 engine producing 335 horsepower and 368 lb-ft of torque. Some owners appreciate the car’s elegant design, comfortable interior, and smooth ride, while others find the rear headroom limited due to the sloping roofline, and the infotainment system complex to use. Other engine options were not available for the Gran Coupe. It is paired with an 8-speed automatic transmission.

Engine

3.0L Turbocharged Inline-6 (B58)

• Oil Leaks
  • Description/Symptoms: Oil leaks can develop from various locations on the engine, including the valve cover gasket, oil filter housing, and oil pan gasket. Symptoms include visible oil drips under the car, a burning oil smell, and low oil level warnings.
  • Solution: Replacing the leaking gasket or component. Proper diagnosis is critical to pinpoint the exact source of the leak.
  • Estimated Cost to Fix: $200 - $1,500+ depending on the source of the leak and labor costs.
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can occur from the water pump, thermostat housing, or radiator. Symptoms include low coolant level warnings, overheating, and visible coolant leaks.
  • Solution: Replacing the faulty component and potentially flushing the cooling system.
  • Estimated Cost to Fix: $500 - $1,200+ depending on the location of the leak.
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Rough Shifting/Hesitation
  • Description/Symptoms: Some owners have reported rough or delayed shifts, particularly when cold. Hesitation or a noticeable delay in acceleration can also occur.
  • Solution: In some cases, a software update can resolve the issue. In more severe cases, valve body replacement or complete transmission replacement may be necessary.
  • Estimated Cost to Fix: $200 (software update) - $6,000+ (transmission replacement).
  • Recalls: None Found
• Transmission Failure
  • Description/Symptoms: Some cases of complete transmission failure have been reported.
  • Solution: Transmission Replacement.
  • Estimated Cost to Fix: $6,000+
  • Recalls: None Found

Suspension

• Adaptive Damper Malfunction
  • Description/Symptoms: The adaptive dampers, part of the optional Adaptive M Suspension, can sometimes fail. This results in a harsh or bouncy ride, warning lights on the dashboard, and a loss of handling composure.
  • Solution: Replacing the faulty damper(s).
  • Estimated Cost to Fix: $800 - $1500+ per damper, including labor.
  • Recalls: None Found

Electrical

• Infotainment System Glitches
  • Description/Symptoms: The iDrive infotainment system can experience glitches, including freezing, slow response times, and connectivity issues with Bluetooth or Apple CarPlay.
  • Solution: Software updates, system resets, or, in rare cases, replacement of the iDrive module.
  • Estimated Cost to Fix: $0 (software update) - $1,500+ (module replacement).
  • Recalls: None Found
• Sensor Malfunctions
  • Description/Symptoms: Various sensors, such as parking sensors, blind spot monitoring sensors, and adaptive cruise control sensors, can malfunction. This results in error messages, non-functional systems, and potentially safety issues.
  • Solution: Replacing the faulty sensor.
  • Estimated Cost to Fix: $300 - $800+ per sensor, depending on the type and location.
  • Recalls: None Found

Exterior

• Tail Light Failure
  • Description/Symptoms: LED tail lights can sometimes fail partially, leading to reduced brightness or segments going dark.
  • Solution: Replacing the entire tail light assembly.
  • Estimated Cost to Fix: $500 - $1,000+
  • Recalls: None Found

Interior

• Seat Motor Failure
  • Description/Symptoms: Power seat motors can fail, preventing the seat from adjusting properly.
  • Solution: Replacing the faulty seat motor.
  • Estimated Cost to Fix: $400 - $1000+
  • Recalls: None Found

Summary

The 2020 BMW 840i Gran Coupe can present a range of issues, from relatively minor electrical glitches to more serious engine and transmission problems. The severity and cost of these issues can vary widely. Oil and coolant leaks are relatively common and can be costly to repair. Transmission issues, especially those requiring replacement, can be very expensive. While the car offers a luxurious driving experience, potential buyers should be aware of these potential problems and carefully inspect the vehicle’s maintenance history before purchase.