I have an April 2006 1.9CDTI (150PS) saloon with the 6 speed automatic gear box. Back at the beginning of October when it had done about 24500 miles I started to get very "jerky" gear changes, particularly when going from 6th to 5th gear. It was like doing a manual change and having selected the next (lower) gear just dropping the clutch instead of feeding it in to get a smooth change. On one occasion I lost power altogether - at 65mph on the outside lane with criuse control engaged!
At first my local Vauxhall dealer (Sewards of Poole) tried chaning the gearbox software, but this did not work. So then they tried more options under the direction of Vauxhall Technical Support. After 4 weeks, two re-conditioned autoboxes and a new ECU, they returned the car saying that it was fixed. However it then leaked oil because the oil cooler pipe seals on the second re-conditioned gear box were faulty.
The leaking oil seals were fixed but then I had the same fault but this time at low speed, e.g. when going from 2nd to 3rd. This symptom appeared to occur after about 40 miles of driving and then having stopped for a short period of time. The gearbox also seemed reluctant to use 2nd gear even when using the manual override.
The car went back to Sewards and Vauxhall Technical Support agreed that a BRAND NEW gearbox should be fitted. I understand that this has now been done, but that in testing the Service Manager from Sewards has had the symptoms occur again.
Has anyone else had this problem and/or know what the solution might be?