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.
Adaptive Hydraulic Pressure Control
The GS 20 monitors engine speed via the CAN bus along with the transmission input and output speed signals simultaneously to determine the slip ratio and slip time during a shift. Slip ratio and slip time are influenced by production related differences between transmissions and by aging.
The comparison of target and real slip allow the GS 20 to perform the adaptive pressure control function by modifying the PWM control of the main pressure regulator solenoid increasing the clutch apply pressures to compensate for internal slip. The adaptive pressure control function optimizes the shift quality and increases the life span of the clutch plates.
The adaptive pressure control feature is not an AGS function.
Clearing adaptation values with the DIS or MoDiC only clears this pressure control adaptation values. Clearing these values can lead to bad shift quality until the shift pressure is again optimized by the adaptation. See Fig 1 .
NO RELATED
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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.