GF27.60-P-3012N Emergency Default Mode, Function

GF27.60-P-3012N Emergency Default Mode, Function
TRANSMISSION 722.9 in MODEL 171.4, 203, 230 up to Model Year 2008
TRANSMISSION 722.9 in MODEL 209, 211, 215, 219, 220
TRANSMISSION 722.9 in MODEL 463.303 /340 /341 up to 31.5.12

In order to ensure a safe driving state and to prevent damage to the automatic transmission, the VGS electric control unit (Y3/8) switches to the limp-home mode if critical faults occur. In the event of a hardware fault all the control solenoid valves are switched off.

They are then de-energized. In limp-home mode, the transmission shifts to 6th gear. After engaging selector lever position "P", 2nd gear is selected in selector lever position "D". Reverse gear R from the convenience program is available. As a result the vehicle can be brought to the nearest Mercedes-Benz service outlet.

If hydraulic faults occur, the transmission does not shift out of the gear currently engaged. If the fault is in the control solenoid valves, the gear affected is locked out and cannot be engaged anymore.
Up to 16 faults are stored simultaneously in the fault memory. These can be read out using STAR DIAGNOSIS.