Mechanical backup with non-active control module

• The transmission shifts out of all forward gears into hydraulic 4th gear. The torque converter clutch is unlocked (not applied). All solenoid valves are de-energized.
• Maximum shift pressure is applied to the power-transmitting elements.
• Reverse gear can be engaged. The shift lock solenoid is active (in "P" and "N").
• All of the segments of the transmission range selector lever display are dark.
• The MIL lights up when the Engine control module (ECM) has recognized a CAN-bus malfunction (missing data exchange between engine and transmission control modules) (after 2 Dcy); if necessary, check DTC memory of the control module.
• Transmission control module -J217- does not function at all, i.e. it cannot be checked via On Board Diagnostic (OBD).

Fig 1: Identifying Transmission Range Selector Lever Display (All Segments Are Dark)

Courtesy of AUDI OF AMERICA, INC.