Cruise Control causes "Thud"?

[Zhangy]

I was driving 115km on high way. I was hard on cruise and held the cruise knob in the upper position for 2/3 seconds trying to get the car to 120km. 1st second no speed increase, 2nd second no speed increase then on the 3rd second “thud" ... and my car still did not increase to 120km after 3s of lever pressing. It felt as if the automatic transmission messed up or skipped a gear...

Anyone had similar experience?

[lukey86]

Originally Posted by Zhangy

I was driving 115km on high way. I turned on cruise and held the cruise knob in the upper position for a few seconds trying to get the car to 120km. Then “thud" ... anyone had similar experience?

Never had that happen before, I use cruise control al the time for boring highway driving too. What kind of thud? I'm trying to picture what it could be. Something with the electronic throttle possibly?

[Wise]

Was it an audible thud or just a felt thud?

Strong thud or slight?

A slight thud when taking your finger off the upper position is normal.

[WesleyG]

has it happened only once? maybe while paying attention to the cruise control you may have hit a small imperfection in the road? has happened to me before

[Zhangy]

Originally Posted by Wise

Was it an audible thud or just a felt thud?

Strong thud or slight?

A slight thud when taking your finger off the upper position is normal.

moderate thud, felt as if the transmission messed up, skipped a gear or something like that

[lukey86]

What Wise is talking about is normal. Not usually very noticable in these cars, when hard on the cruise control theres a tiny bit of engine braking just while everything settles, would'nt describe it as an audible "thud" though

[Wise]

Originally Posted by Zhangy

moderate thud, felt as if the transmission messed up, skipped a gear or something like that

What speed where you going and what gear was it in?

Auto or manual?

[lukey86]

With autos it'll sometimes go back a gear as you hit the cruise paddle, no different to normal acceleration...then it'll slide back into top gear once your off the paddle and it settles, it's possible that it's gone back a gear at about the same time as you've let go of the paddle, which is very normal. It will feel like it's skipped a gear as you described. Autos are very weird creatures under cruise control

assuming you do have an auto lol

[Zhangy]

Originally Posted by lukey86

With autos it'll sometimes go back a gear as you hit the cruise paddle, no different to normal acceleration...then it'll slide back into top gear once your off the paddle and it settles, it's possible that it's gone back a gear at about the same time as you've let go of the paddle, which is very normal. It will feel like it's skipped a gear as you described. Autos are very weird creatures under cruise control

assuming you do have an auto lol

yeah i do have an auto.. sometimes I feel like I have no throttle control. Maybe it's the same reason

[lukey86]

Originally Posted by Zhangy

yeah i do have an auto.. sometimes I feel like you have no throttle control. Maybe it's the same reason

Yeah, one of the reasons I got a manual. That moment when you wanna get hard on the throttle, you put your foot down and nothing lol


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[chubky]

This definitely happened to me. I was in cruise control and tried to accelerate, my rpms jumped all over the place. Haven't tried using cruise control since. None of my other cars ever did this in cruise control. Seems a bit off. I'm scheduled for a maintenance check soon. I was going to ask the dealer to take a look since my cars still under warranty

[Tcoat]

Originally Posted by chubky

This definitely happened to me. I was in cruise control and tried to accelerate, my rpms jumped all over the place. Haven't tried using cruise control since. None of my other cars ever did this in cruise control. Seems a bit off. I'm scheduled for a maintenance check soon. I was going to ask the dealer to take a look since my cars still under warranty

Better get it checked yes! I can do my whole 2 hour commute without touching the gas pedal once when I hit the highway. Cruise is smooth and responsive as I have ever had.

Sorry just realized you are AT and I am MT so not comparing apples to apples!

[Demandred7]

The only thing that I might characterize as any sort of thud is the transmission kicking down a gear or two on steeper inclines or if I resumed the cruise at a speed way below the set point. If it isn't these things, then get your car checked.