P0730 Incorrect Gear Ratio

P07350

Diagnostic information - Tiptronic

P0730 Incorrect gear ratio

Diagnostic conditions
The control unit must be active in order to test internal function sequences and diagnosable inputs/outputs.
In the event of a fault, check whether the fault is permanently >present<. To perform the check, erase the fault memory, meet the diagnostic conditions and read out the fault memory again.

NOTE:
The ATF fluid level in the transmission must be OK and the specified ATF fluid must be used.
The ATF filter and cooler must not be blocked.
- Voltage greater than 10.1 V and less than 15.5 V
- Ignition on
- Internal control unit function test
- Engine runs without malfunctions, engine speed > 500 rpm
- Temperature of ATF fluid > 20 °C (68 °F)
- Selector lever in position D
- No selector lever faults
- No sensor speed faults: PSM, input shaft, output shaft
- No electrical faults on solenoid valves

Possible fault causes

NOTE:
There is a fault in the mechanical/hydraulic parts of the transmission.
- Mechanical fault

Fault effects
- Fault display in multi-function display in instrument cluster
- Limp-home mode 2
- No self-teaching check >>Adaptation<<
- Tiptronic control unit sends a signal to the DME control unit to limit the torque