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Just this week my 2015 has started doing something weird. The best way I can think to describe it, is it's losing power. I notice it while driving highway speeds, every once in a while it will lose power (slow down) for just a few seconds and then it speeds up again. It doesn't matter if I use cruise or not. My last fuel fill up was Sunday at a top tier station. Any ideas what could be going on?

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loss of power

If it was bad fuel it would happen constantly. From previous posts the loss of power if I recall usually was due to a turbo failure issues. Do a search on the site for turbo failure etc...and see if it sounds similar to your issue ?
 

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Watch the tachometer, if it is rising and the car doesn't respond with increased speed, it could be the transmission slipping.

Lack of power can also mean that the turbo isn't providing boost when it should, sometimes caused by a stuck open waste gate.

If your car is under warranty take it to a dealer, if the dealer you have been going to isn't doing anything for you change dealers, you might find a more knowledgeable mechanic at another dealer.
 

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How many miles on the Trax? A loss of power then regaining power (surging at steady speed) could also be a dirty/restricted fuel filter, dirty air filter, restricted catalytic converter, or intermittent turbo malfunction. I did get one bad tankful of regular 87 octane top tier gas and it was pinging and losing power. I switched to premium 92 octane top tier fuel since then with no more problems.
 

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Discussion Starter #5
How many miles on the Trax? A loss of power then regaining power (surging at steady speed) could also be a dirty/restricted fuel filter, dirty air filter, restricted catalytic converter, or intermittent turbo malfunction. I did get one bad tankful of regular 87 octane top tier gas and it was pinging and losing power. I switched to premium 92 octane top tier fuel since then with no more problems.
It has 28,000 miles. I have been buying 87 octane and once a month I go to Krogers and use my points for discounted fuel. I'll try 92 octane next time I fill up. If that doesn't help, I'll take it in to the dealer.

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The dealer would have to fix it for no cost considering you'd still have warranty.

The octane thing could help, but if it doesn't, I'd be really interested to hear what the dealer has to say went wrong so keep us updated!
 
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