Recalls: BMW E64 M6 Convertible
Overview
Manufacturers, or importers, issue recalls for defects or faults which have the potential to cause injury. Generally, manufacturers will inform the original buyers if their vehicle is subject to a recall and of the steps required to remedy the defect or fault. Please note that the recalls below (if any) are for Australian-delivered vehicles only. Furthermore, the number of recalls should not be taken as an indication of a model’s reliability or its safety more generally.
Recalls: BMW E64 M6 Convertible
- In July 2006, a recall was issued for BMW E64 6-Series Convertible vehicles manufactured from 9 January 2006 to 26 April 2006. In these vehicles, the lower rubber mounts could come loose from the rear shock absorbers – if this occurred, wheel guidance would be lost and, depending on the driving situation, it may not be possible to control the vehicle safely (PRA 2006/8620).
- In March 2012, a recall was issued for all BMW E64 6-Series Convertibles that were available for sale up to 31 July 2010. In these vehicles, the battery cover may not have been correctly clipped to the floor panel due to an assembly error – this could cause loosening and possible overheating of the positive terminal cable connection which could, in turn, result in a fire in the luggage compartment even if the engine was not running (PRA 2012/13082).
Problems and faults: BMW E64 M6 Convertible
Overview
This section identifies potential problems, causes and fixes based on the experiences of owners and repairers, online sources and technical service bulletins. This information is provided solely for reference purposes and AustralianCar.Reviews recommends that only properly qualified persons carry out repairs or modifications. Furthermore, the number of items below should not be taken as an indicator of a model’s reliability or the frequency with which they may occur.
To report a problem or fault to the AustralianCar.Reviews team, please use the Contact Us form. Note that AustralianCar.Reviews does not offer advice on automotive problems or disputes; such enquiries will not receive a reply. For vehicles purchased from dealers after 1 January 2011, please see our Australian Consumer Law fact sheet.
S85 engine: connecting rod bearing wear
The connecting rod bearing clearance to journal ratio for S85 engines produced from 2007 to October 2008 (with 088/089 bearings) is less than is generally recommended by engine builders. This lack of clearance causes inadequate oil lubrication between the crank journal and the connecting rod bearings, resulting in premature wear of the rod bearings. For the 702/703 bearings that were subsequently introduced, bearing eccentricity was increased for greater clearance. After initially specifying 10W60 engine oil, BMW permitted the use of thinner LL-01 approved 0W40, 5W30 and 5W40 oils.
For a detailed discussion of the connecting rod bearing clearance design attribute as it pertains to the related S65 engine, please see http://www.m3post.com/forums/showthread.php?t=892838.
S85B50 engine: throttle body actuator failure
For the S85B50 engine, there are two throttle body actuators (part no. 13627838085, one per cylinder bank) that are susceptible to failure. Failure of the throttle body actuator causes the vehicle to enter ‘limp home’ mode and may issue code 2B21 (among others). Throttle body actuator failures have been reported from 50,000 kilometres.
The gears within the actuators are made from plastic and wear over time, causing uneven mesh and increased resistance to motion. As a result, the control board applies additional current to the motor to overcome the resistance. The circuit control board, however, does not have over-current protection so that the driver MOSFETs fail due to source-to-drain shoot-through; this may also cause the gate lead to fail. This, in turn, damages the gate driver circuitry and renders the circuit board inoperable. Since some MOSFET failures do not take out the gate driver, replacing the MOSFETs alone may repair the circuit board.
It is understood that aftermarket suppliers are producing brass gears to retrofit to the actuators.
BMW E64 M6: active steering sensor failure
In September 2006, BMW issued technical service bulletin SI B34 05 06 for BMW E64 M6 Convertibles that were manufactured from 26 August 2005 to 28 July 2006. In these vehicles, the optical sensor in the SZL (Steering Column Switch Sensor) may fail. According to the service bulletin, a defective optical steering angle sensor could cause failure of:
- Active Steering;
- Dynamic Stability Control (DSC);
- Active Roll Stabilization (ARS);
- Adaptive Headlights (AHL);
- Active Cruise Control (ACC); and,
- The automatic turn signal reset function.
Please note that one or more systems may fail depending on the degree of damage to the optical steering angle sensor. Furthermore, the failure of DSC, ARS and Active Steering would be indicated by indicator lamps and display messages. To fix, the optical sensor in the SZL was to be replaced.
E64 M6: rear differential grinding noise
In January 2009, BMW issued technical service bulletin SI B33 01 02 for E64 M6 Convertibles. In these vehicles, a grinding noise may be heard from the rear differential during slow cornering; the noise was most prevalent during turning manoeuvres with a high degree of lock such as parallel parking or tight circles.
When cornering, a ‘slip stick’ effect was created on the lining and steel discs incorporated in the differential locking clutch, thereby causing the grinding noise. The noise typically dissipated as the locking clutch discs in the differential were ‘broken in’. The break-in time, however, varied according to driving habits.
For the E46 M3, E90/E92/E93 M3, E60 M5 and E63/E64 M6, a specially formulated differential oil (part number 83 22 2 282 583) was recommended.
Problems and faults: BMW E64 M6 Convertible
- If there is a rattling noise from the front of the engine and the ‘check engine’ light illuminates, there may be a leak in an oil line for the variable valve timing system.
- If the ‘check engine’ light is illuminated and the engine is running rough, the camshaft position sensors may have failed.
- If a ‘rollover protection fault’ message appears on the driver information centre, there may be a problem in the wiring or with the connectors.
- The ‘electronic steering lock’ warning light may illuminate if battery was low when starting.
- The ‘convertible roof’ warning light may give false readings (i.e. indicating the roof is not fully open or closed when it actually is) due to a faulty sensor.
- The automatic headlights may not turn off when exiting a tunnel or parking garage due to a miscommunication between the sensor and headlight module.
- For models with steering wheel gearshift paddles, the paddles may stop working due to loose connectors terminating the electrical circuit.
- Where fitted, the night vision display may malfunction due to a damaged wiring harness (near headlights).
- The universal garage door opener may not accept a code from a different source (i.e. a new transmitter or new owner) if the batteries in the transmitter are low.
