Ducato Euro 6 Auto 2022 160bhp

[stevel]

Hi
I’d be interested to know if anyone who has a similar engine / transmission to ours has the same issue. Sometimes, and I can’t identify the exact conditions to repeat it, when going downhill and easing off the throttle the engine revs go from sub 2000 to 3500 in seconds whilst staying in the same gear. This has happened quite a few times recently and usually when cruise control is on, although it did happen today when I was not using cruise control. The only way I have of controlling the engine revs is to knock it into manual and upshift into a higher gear and then braking if necessary. To me, there seems to be a problem with the gearing ratio.

 

[lunarman]

I have a 2021 160 auto and it happened to me just the once. It was on the second time out we were in slow moving stop/start traffic the road dipped suddenly downhill and the traffic started moving I expected the gearbox to change up but the revs just increased and there appeared to be no engine braking the only way to control the speed was on the brakes. I had to stop at the bottom of the hill at traffic lights and then everything operated normally. It's never happened again

 

[Bessy765]

Sometimes an auto will not change up when going down hill if you foot is not putting any pressure on the accelerator?

 

[Russell's Dad]

Sometimes an auto will not change up when going down hill if you foot is not putting any pressure on the accelerator?

This. It's trying to help you slow down by engine-braking.

 

[Bessy765]

Excactly if you take your foot right off it will think you are trying to slow down so goes down if you rest your foot lightly on the pedal it will change up

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[Old Gibber]

Hi
I’d be interested to know if anyone who has a similar engine / transmission to ours has the same issue. Sometimes, and I can’t identify the exact conditions to repeat it, when going downhill and easing off the throttle the engine revs go from sub 2000 to 3500 in seconds whilst staying in the same gear. This has happened quite a few times recently and usually when cruise control is on, although it did happen today when I was not using cruise control. The only way I have of controlling the engine revs is to knock it into manual and upshift into a higher gear and then braking if necessary. To me, there seems to be a problem with the gearing ratio.

I'm puzzled by this, if the revs almost double in seconds, then it cannot stay in the same gear. With the pre-electronic dash, the Fiat auto doesn't actually tell you which gear it is in.

As has been said I suspect this is just normal auto gearbox reaction to going down a steep hill, where the box drops down a couple of gears to provide engine braking.

 

[rwg]

We have the 160 with the 9 speed auto and this is pretty normal - it holds a low gear and high revs when going down hill and your foot is off the accelerator. Unnerving the first few times, but it actually does provide a decent amount of engine braking. If you want to accelerate down the hill then just give it some accelerator and it will change up.

cheers,

Robin

 

[TrudeandDall]

As everyone says : it's just the auto box trying to control your downhill speed and with 3.5t pushing your speed up, then it's no surprise that the revs increase.
My engine is the new 2.2 -140 with AT9 and I have to say there is not a terrific amount of engine braking, but it never usually goes above 3500 rpm.
On the flip side, for those who expect the auto box to change up rather than limit the speed using engine braking. If this was to happen, would soon resemble a 'runaway train"......