cwtt

On my IS350 if I am cruising at 65mph and I touch the brake pedal the car will downshift into 5th gear and will continue to hang in 5th gear for quite some time even though I am still going 65mph with my foot off the break.

I am still on the gas and it sits in 5th gear for a while. I can see it is in 5th gear on the gear selector screen on the dash. If I push the "SNOW" button it will immediately shift into 6th gear.

I am just cruising in the normal mode, not the PWR or SNOW mode.

It almost seems like a software thing.

Any ideas?

tex2670

I've only noticed this when I'm going down a hill.

chikoo

IS - Intelligent sport

If you touch the brakes, it is anticipating slow down and shifts to a lower gear in case you hit the gas pedal and want a quick getaway.

Gville350

iTrader: (10)

It'll also down-shift two or three gears depending on the speed, brake pedal pressure applied, and the pecent of decline of the hill you are on.

cwtt

I can understand the theory and application, however it stays in 5th gear waaaay to long. I'm cruising going 65mph and it won't shift into 6th sometimes for 20+seconds and I am on level terrain.

Gville350

iTrader: (10)

Is this during the vehicles warm-up period?

KillaIS250

iTrader: (1)

You can try resetting the ECU so it relearns your driving patterns. Just disconnect the battery for a while and then plug it back in again.

JDKane527

iTrader: (10)

You can try turning off VSC/VDIM by holding the traction control button for sometime. Dumbs down the ECU a bit. I noticed it doesn't apply as much brake assist for you when you tap the brakes.

heyarms

iTrader: (5)

Way too long based on what? Fuel economy between the two in minimal. In 5th you can accelerate quicker and it's simply an ECU thing. I wouldn't lose sleep over something like this. It's just how the (or your) transmission works, based around your driving habits.

dmvp29

This is completely normal. It's just what you have to live with by choosing an automatic transmission.

And I agree, I don't think it actually serves any useful purpose. It's irritating and needlessly wastes extra gas.

08IS350

It happens to me too. Sometime it holds in 5th gear for a good couple of miles even on flat after downhill. It is annoying and we have to live with it, So yes i change it Snow to make it shift to 6th again. Sometime i was even driving 80mph in 5th.

heyarms

iTrader: (5)

Do y'all really find this offensive that the car holds 5th gear for XX amount of time that YOU think is unnecessary? I'm pretty sure our ECU's aren't so careless to do something that is inappropriate. And fuel consumption between the two gears (5 and 6) for the seconds (or a minute or two) is very negligible. It's an AUTOMATIC transmission. It's there to make your life easier, and it's doing just that, except you're bothered by the gear is it in for short amounts of time...

skillvsluck

put in S mode and it won't do that...

smokyis350

iTrader: (21)

when I go downhill, it would put it to 5th gear for couple miles. I just put it to neutral...

heyarms

iTrader: (5)

Sport mode is a gear limiter, not a gear shifter. So yes, it will still do it.