2009 BMW M5

2009 BMW M5

Overview

The 2009 BMW M5, a high-performance variant of the 5 Series, is renowned for its exhilarating driving dynamics and potent V10 engine. However, like many complex performance vehicles, it presents a unique set of reliability considerations. This data focuses on documented common issues beyond routine maintenance, highlighting areas where owners may encounter specific problems. While the M5 offers an unparalleled driving experience, potential buyers and current owners should be aware of these technical aspects to manage expectations and maintenance costs effectively. The focus here is on recurring mechanical and electrical faults that have been reported by owners and technicians.

---

Engine

5.0L V10 S85

Rod Bearing Failure

• Symptoms: Knocking or rattling noise from the engine, especially under load; potential for catastrophic engine failure.
• Solution: Replacement of rod bearings, often with upgraded aftermarket bearings. Requires engine disassembly.
• Cost: $3,000 - $7,000+

Throttle Actuator Failure

• Symptoms: Check engine light, limp mode, rough idling, inconsistent throttle response, error codes related to throttle bodies.
• Solution: Replacement of throttle actuators (typically requires replacing both).
• Cost: $1,500 - $3,000

Oil Consumption

• Symptoms: Excessive oil level drop between changes, blue smoke from exhaust under acceleration.
• Solution: Can be due to worn piston rings, valve stem seals, or PCV system. Requires diagnosis and component replacement.
• Cost: $1,000 - $4,000+

Transmission

7-Speed SMG III (Sequential Manual Gearbox)

Hydraulic Pump Failure

• Symptoms: Transmission warning lights, inability to shift gears, jerky shifting, slow gear changes, pump noise.
• Solution: Replacement of the SMG hydraulic pump and fluid.
• Cost: $2,000 - $4,000

Clutch Actuator Issues

• Symptoms: Difficulty engaging gears, clutch warning lights, rough engagement, transmission error messages.
• Solution: Adjustment or replacement of the clutch actuator.
• Cost: $1,000 - $2,500

Suspension

Adaptive Drive System

Active Roll Stabilization (ARS) Leaks/Failure

• Symptoms: Warning lights related to suspension, clunking noises over bumps, reduced cornering stability.
• Solution: Repair or replacement of leaking hydraulic lines, pumps, or active anti-roll bars.
• Cost: $2,500 - $6,000+

Electrical

General Electrical System

iDrive System Glitches

• Symptoms: Screen freezing, unresponsiveness, navigation errors, audio issues.
• Solution: Software updates, module resets, or replacement of the iDrive controller or head unit.
• Cost: $500 - $2,000

Fuel Pump Failure

• Symptoms: Engine sputtering, loss of power, difficulty starting, check engine light.
• Solution: Replacement of the fuel pump.
• Cost: $800 - $1,500

Exterior

Standard Body and Trim

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: N/A

Interior

Standard Interior Components

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: N/A

---

Summary Verdict

The 2009 BMW M5 is a performance icon with a powerful V10 engine and engaging SMG transmission. However, its complexity translates to specific reliability concerns, most notably potential rod bearing failure in the V10 engine and issues with the SMG transmission’s hydraulic system and actuators. The advanced Adaptive Drive suspension can also be a source of expensive repairs. Electrical gremlins, particularly with the iDrive system, are not uncommon. While the exterior and interior are generally robust, the mechanical and electronic systems require diligent maintenance and can incur significant repair costs. Prospective owners should budget for potential high-cost repairs, especially concerning the powertrain and suspension.