IS - 3rd Gen (2014-present) Discussion about the 2014+ model IS models

Stuck in 5th gear on cold start

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Old Dec 25, 2019 | 06:15 PM
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swaangin
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Default Stuck in 5th gear on cold start

When I drive my car around, I noticed when it's still cold (after idling for 1-2 min), on the highway when I am slowly getting to 40-60mph, the car will stay in the 5th gear. After it warmed up, it still stayed in 5th gear (have it on cruise / Eco mode) and it still stayed in 5th until the car got even warmer (needle was a quarter over the C).. is this normal?

2015 IS 250 AWD 40K miles
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Old Dec 25, 2019 | 07:49 PM
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Originally Posted by swaangin
When I drive my car around, I noticed when it's still cold (after idling for 1-2 min), on the highway when I am slowly getting to 40-60mph, the car will stay in the 5th gear. After it warmed up, it still stayed in 5th gear (have it on cruise / Eco mode) and it still stayed in 5th until the car got even warmer (needle was a quarter over the C).. is this normal?

2015 IS 250 AWD 40K miles
Short answer...Yes. The ECU is trying to keep the revs up so the vehicle will warm up faster. Once it's warm enough, then it will upshift to 6th.
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