Transmission Identification
BMW automatic transmission are manufactured by two suppliers for the US market
- Zahnradfabrik Friedrichshafen: Commonly referred to as ZF. ZF manufactures both manual as well as automatic transmissions.
- GM Powertrain - Hydramatic: Hydramatic is a manufacturing division of General Motors located in Strasbourg, France. Hydramatic supplies automatic transmissions to BMW for four and six-cylinder vehicles.
BMW has developed an internal numbering system for their transmissions for ordering parts, information research and identification. Also, each transmission manufacturer uses an internal identification system. Here is a breakdown of these identification codes
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Hydramatic Transmissions have internal designations, however they are not used often. The internal code for the A4S310/270R is 4L30-E and the A5S360/390R is 5L40-E.
Identification Page
The ID page is helpful to determine the Transmission and control system used as well as the chassis number and current software version. Always print out a copy of the ID page when performing any diagnosis or programming procedures.
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Overview Of Allowable Repairs
Currently, service of transmissions covered under warranty is limited to level I. Level I service includes electrical, minor mechanical and hydraulic repairs as well as repair manual provided service adjustments.
Part availability is limited to include the repair of the following
- Oil Leaks - Radial Seals and gaskets.
- Mechanical/Hydraulic Faults - Torque Converter, Valve Body, parking pawl, oil pan, output shaft bearing.
- Electrical Faults - Solenoid Valves, pressure regulator valves, wiring harness.
- Signal Sensing - Turbine and Output Speed Sensors, CAN bus, Temp Sensor.
