Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
"Understanding AEGS" Troubleshooting Book (24 07 89)
Reference number: 24 07 89
"UNDERSTANDING AEGS" TROUBLESHOOTING BOOK
TECHNICAL SERVICE BULLETIN
| BMW: | Models With AEGS Transmission System |
| GROUP: | 24 - Automatic Transmission |
SUBJECT
"Understanding AEGS" Troubleshooting Book
BMW of North America is proud to announce the release of the new AEGS transmission troubleshooting publication, "Understanding AEGS".
As the title suggests, the primary intent of the new book is to provide the BMW Service technician with an expanded understanding of the theory and operation of the AEGS electronic, hydraulic transmission system.
"Understanding AEGS" guides the BMW technician through systematic and sensible troubleshooting steps and procedures. Special tools, functions and the nature of all AEGS signals are clearly illustrated to assure efficient troubleshooting and eliminate guesswork.
All BMW technicians are encouraged to review this new publication and become familiar with the many advantages of "Understanding AEGS".
Initially one copy will be supplied to all BMW dealers under the automatic tool shipment program.
Additional copies can be ordered (Publication #SD 89-030) at the special introductory price of $20.00 each.
The AEGS transmission system is predictable and highly efficient when supplied correct input information.
Our AEGS troubleshooting techniques can also be predictable and highly efficient when conducted by an informed BMW technician using proven systematic procedures.
Comments are encouraged concerning any aspect of the new publications or future similar books covering other BMW systems. Comments should be listed on the familiar quality control "pink sheet" and mailed to BMW NA.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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