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The automatic transmission in BMW E39 models is electronically controlled and is able to adapt fluid pressure and shift points over times as parts wear.The ability to adapt shift points depending on pressure and slip extends the lifetime of your transmission.When diagnosing an issue keep the following in mind: Shift quality issues consist of harsh up or down shifts, improper shift points and erratic shifting.These complaints could be related to electronic / software issues or hydraulic / mechanical problems.As with most concerns, check the transmission fluid level and condition as well.Before digging too deep on delayed upshift issues, make sure you consider when this occurs.The pressure regulation solenoid is de-energized resulting in maximum line pressure. Vehicles with low version clusters will display a fault symbol in the cluster.
The check engine light will also be illuminated by the DME.
When investigation transmission leaks, be sure to verify that the suspected leak is actually transmission fluid.
Engine oil, hydraulic and brake fluid can be mistaken for a transmission leak.
If you see this message, pull over and have the vehicle towed to where you can work on it, unless it is a short drive.
The BMW E39 I received this message on was stuck in fourth gear.
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Depending upon application, the transmission will shift into 3rd or 4th gear on a four speed, and 4th or 5th gear on a five speed.