[planemad]

I have a 320d ed with the sport auto gearbox.
The car is a March 13 and has 9k on the clock.

Over the last few weeks something is occurring that I have never felt before.

When pulling up and sitting idle "say at traffic lights" I stay in drive and hold it on the foot brake. I sit there for 5-10 seconds and whilst still idle after the 5-10 sec period the gearbox seems to change down a gear and the car jolts very slightly.

Has anyone come about this issue? or heard of it?

Thanks

[Proftinkerpot]

I noticed today while sitting at lights on a steep hill, when I lifted my foot off the brake, the car started to roll backwards very slowly. I thought this was impossible as the gearbox is effectively in first.

[HighlandPete]

Originally Posted by Proftinkerpot

I noticed today while sitting at lights on a steep hill, when I lifted my foot off the brake, the car started to roll backwards very slowly. I thought this was impossible as the gearbox is effectively in first.

You can roll back in autos, didn't the Hill Start Assist function? Or was it a longer duration off the brake, and it disengaged?

HighlandPete

[HighlandPete]

Originally Posted by planemad

I have a 320d ed with the sport auto gearbox.
The car is a March 13 and has 9k on the clock.

Over the last few weeks something is occurring that I have never felt before.

When pulling up and sitting idle "say at traffic lights" I stay in drive and hold it on the foot brake. I sit there for 5-10 seconds and whilst still idle after the 5-10 sec period the gearbox seems to change down a gear and the car jolts very slightly.

Has anyone come about this issue? or heard of it?

Thanks

Wonder if it is a glitch with NIC (Neutral Idle Control). Description is similar to a problem suffered in some ZF 6-speed autos.

If it does it often report it to the dealer, may be as simple as needing a software reflash/update.

HighlandPete

[nordberg]

Originally Posted by HighlandPete

Wonder if it is a glitch with NIC (Neutral Idle Control). Description is similar to a problem suffered in some ZF 6-speed autos.

If it does it often report it to the dealer, may be as simple as needing a software reflash/update.

HighlandPete

Volvos used to suffer badly from this. Often an ECU flash would correct it...

[dicky.hillary]

I have similar symptoms with my car, but mine also lurches forward when coming to a halt, it makes it nearly impossible to come to a stop smoothly. I have notice that the gear changes are not as "silky smooth" as BMW would have you believe. I think another trip to the dealer is in order.