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Thursday, 3 December 2015

Engine start-up failure in BMW models


Engine start-up failure in BMW models
Today we will describe a failure that affects the X6 35 xdrive aut. E71 (30 6D 5) model of the BMW brand, specifically a failure related to the engine.  

AFFECTED VEHICLE
BMW X6 35 xdrive aut. E71 (30 6D 5)

SYMPTOM
The engine does not start.

FAILURES REPORTED
Failures codes reported by the DDE engine control unit.

507D – Parking lock deactivated erroneously.
CF37 – CAS messages in the wrong K bus.

CAUSE

If the engine fails to start, due to a voltage drop caused by an excessive requirement when starting the engine, either because of a low battery or because of keeping the ignition switched on over an extended period of time, this may be due to a lack of communication between the CAS (Car Access System) unit and the DDE (Digital Diesel Electronics) engine control unit.

NOTE: It should be noted that in this model, in case of a real problem with the CAS (Car Access System), the starter motor is not launched.

 Engine start-up failure in BMW models
A2249 Unidad DDE

REMEDY

Pairing of the CAS and DDE units with an appropriate diagnostic tool.

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  8. Regular BMW maintenance is crucial to prevent engine start-up failures, particularly in models such as the X6 35 xdrive aut. If the engine fails to start due to a voltage drop caused by a low battery or extended periods of ignition, it may be due to a lack of communication between the CAS and DDE units. To avoid such failures, it's essential to keep up with routine BMW Maintenance, including regular battery checks and maintenance of the Car Access System and Digital Diesel Electronics engine. By keeping your BMW maintained, you can avoid these engine start-up failures and maintain the optimal performance of your car.

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