P0730

Hydraulic malfunction

Fault symptoms
CHECK GEARBOX warning lamp on.
TCM in Limp-Home mode.
Slippage in the transmission.

Conditions
The difference between input shaft speed and output shaft speed (speed of the car) is more than 10% above the gear ratio for more than 5 seconds.
Diagnosis will not be performed if:
1. The TCM is in Limp-Home mode.
2. Car speed is below 25 km/h.
3. The selector lever is in P. R or N.
4. The accelerator position is less than 10%.
5. The fluid temperature is lower than 20°C.
6. Less than 10 seconds has elapsed since shifting occurred.
7. Engine speed is below 400 rpm.
8. Diagnostic trouble code 0717 or 0722 has been generated.

Diagnostic help
The control module calculates the ratio between input and output shaft speed. For each gear there is a definite relationship, depending on the ratio. The fault indicates a mechanical malfunction. Wear in the transmission may be the cause of abrupt shifting and an inoperative Lock-up function.