Question about Hyundai Sonata

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New 2008 Hyundai sonata. undder 1300miles since we got his car every time you go 40 mph we hear a large humming sound coming from the passenger side as if the road is rough I we give alittle more gas the noise and the rouhd road stops

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  • bob Alice Aug 21, 2008

    thank you alot the dealer does not know this my third time aT THIS DEALER bob

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This behavior is due to the innovation of the ECT-i ( Electronic Controlled Transmission with intelligence). Major car companies are developing this type of transmissions nowadays. And, since they are in their early stages, is still not fine-tuned; ergo still under research. This doesn't mean the transmission will fail either.

The vibration indicates the car is in low revs when engaged in the last gear. Let's say it's a 5 speed auto trans... and the car is going about 35mph at 5th gear... even though the ecu in the car recognizes it should go to 4th gear, the only thing the car ecu can do is reduce the gas input, because the trans got it's own ecu, and it's not controlled by the main ecu anymore. When you
accelerate, increases revs, ergo downshifting to 4th gear and getting rid of the vibration. The powerplant in the vehicle is still OK. No need to worry about.

Posted on Aug 21, 2008

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