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.
Transmission Control System (GS 20): Notes
System is controlled by the GS 20 control module. The acronym (GS) comes from the German word "Getriebesteurung", meaning Gearbox Control. The design, program development and manufacturing of the GS 20 control system is the result of the combined efforts of BMW, Siemens and GM. The GS 20 control module is located in the E box in the engine compartment. See Fig 1 . It utilizes the 134 pin, "SKE" (standard shell construction), modular connector, enclosure. See Fig 2 , Fig 3 and Fig 4 .
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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.