Car Guys - cruise control issue

[StormHawk42]

Just got done with a road trip with TBW. Our vehicle runs just fine; recently crossed 50k miles. Since we traveled a lot of interstate, I had the cruise on a lot. But whenever we went up even modest inclines, the cruise would rev up from about 2500 RPM to 3500 RPM and it would do it in rapid succession so it was very jerky.

Any ideas? Hopefully not a transmission issue. Oh and I know crap about cars so explain this to me like I’m five years old.

Here’s some butts for your trouble.

 

[Gimmered]

I would have your transmission serviced. New filter and fresh fluid at 50,000 wouldn't be a bad idea anyway. Possibly low on fluid, could be a vacuum issue. May just be the way the PCM is programed.

 

[ericram]

Yea time to upgrade to a better vehicle. This one is due to shit the bed soon.

 

[Urohawk]

What kind of vehicle? Our honda pilot did this and treated with transmission flush, but it sounds like tranny. My 06 mazda six did this with 80K miles and was done for.

 

[StormHawk42]

What kind of vehicle? Our honda pilot did this and treated with transmission flush, but it sounds like tranny. My 06 mazda six did this with 80K miles and was done for.

2018 Hyundai Kona

 

[The Tradition]

2018 Hyundai Kona

Shoot it like a horse with a broken leg.

 

[BGHAWK]

I wouldn't think of taking it to the dealer.

 

[QChawks]

 

[StormHawk42]

 

[Joes Place]

What kind of vehicle? Our honda pilot did this and treated with transmission flush, but it sounds like tranny. My 06 mazda six did this with 80K miles and was done for.

Better hope it's not the tranny.

There are now 28 states where those are banned.

 

[Joes Place]

I would have your transmission serviced. New filter and fresh fluid at 50,000 wouldn't be a bad idea anyway. Possibly low on fluid, could be a vacuum issue. May just be the way the PCM is programed.

Google hit says that vehicle wants a tranny fluid change at 30k

 

[The Tradition]

Google hit says that vehicle wants a tranny fluid change at 30k

The Tradmobile is approaching 250,000 miles and I've never changed the transmission fluid.

But it's a Honda.

 

[Joes Place]

The Tradmobile is approaching 250,000 miles and I've never changed the transmission fluid.

But it's a Honda.

Your wife probably did it.

 

[Gimmered]

I wouldn't think of taking it to the dealer.

They may very well have a bul

The Tradmobile is approaching 250,000 miles and I've never changed the transmission fluid.

But it's a Honda.

Must avoid tranny at all cost.😂

 

[JupiterHawk]

The Tradmobile is approaching 250,000 miles and I've never changed the transmission fluid.

But it's a Honda.

You would probably blow it up now with a flush.

 

[JupiterHawk]

2018 Hyundai Kona

You should be in year 5 of the warranty. I would take it in.

 

[bagdropper]

Welp...here's how I look at it. 2018 appears to have two powertrains - a 2L 147hp w) 6 speed AT - or a "Gamma" 1.6L 175hp turbo w) 7 speed dual clutch AT.

Doesn't appear those are CVT transmissions. Good ol' fashioned slush boxes. But what you're describing is a case where the computer doesn't know what gear to be in when the load on the engine/AT increases.

So...if your vehicle has a manual shift mode, use that. Downshift to a gear to make the climb where the engine pulls you up without issues - then shift back into drive once you level out.

6 speed? Try 5th. 7 speed, try 6th or even 5th gear. Just leave it in the gear it takes to make the climb, then once at the top - shift back into drive.

This stops the back and forth computerized shifting - which means less heat and overall stress on the AT. Every time an AT shifts, more heat is created - and excessive heat KILLS AT's. So...take the decision making out of the mix on climbs.

It ain't gonna hurt a thing as long as you remember to shift back into drive once the climb is completed.

BTW, I've been doing this ever since overdrive AT's came out, and have never, ever had a transmission fail on me. Hell, I've even had several vehicles with 700R4's and 4L60E's (notorious for failing over time)...

Never had one fail on me. Ever.

 

[Joes Place]

You should be in year 5 of the warranty. I would take it in.

If you didn't get the trans fluid changed at the recommended interval, the warranty ain't gonna cover it.

 

[Kelsers]

If you didn't get the trans fluid changed at the recommended interval, the warranty ain't gonna cover it.

If he did it's covered.

 

[JupiterHawk]

If you didn't get the trans fluid changed at the recommended interval, the warranty ain't gonna cover it.

30k intervals for transmission flushes seem pretty often to me. I am not sure if OP would be dinged especially when reporting a cruise control issue. Of course, it is the dealer...

 

[alaskanseminole]

Are the RPMs just spiking or is the car accelerating? ...thinking you may have a tranny transmission (dammit) problem.

 

[StormHawk42]

Are the RPMs just spiking or is the car accelerating? ...thinking you may have a tranny transmission (dammit) problem.

Since it’s going uphill, it’s not so much accelerating as it is trying to keep pace with what the cruise is set at.

 

[The Tradition]

Since it’s going uphill, it’s not so much accelerating as it is trying to keep pace with what the cruise is set at.

Have you considered not using cruise control when driving up hills?

 

[StormHawk42]

Have you considered not using cruise control when driving up hills?

Sure. I use the term hills loosely though. This was occurring with gentle inclines.

 

[Kelsers]

Just got done with a road trip with TBW. Our vehicle runs just fine; recently crossed 50k miles. Since we traveled a lot of interstate, I had the cruise on a lot. But whenever we went up even modest inclines, the cruise would rev up from about 2500 RPM to 3500 RPM and it would do it in rapid succession so it was very jerky.

Any ideas? Hopefully not a transmission issue. Oh and I know crap about cars so explain this to me like I’m five years old.

Here’s some butts for your trouble.

Has it changed recently?

 

[Colonoscopy]

bet all the gays were really excited upon first glance at this thread title

 

[Joes Place]

bet all the gays were really excited upon first glance at this thread title

I think his car is just unhappy being called the "male" name they use for it.

Slap a rainbow sticker on 'er and call her Caitlin-J and that tranny will be running just fine!!!

 

[binsfeldcyhawk2]

30k intervals for transmission flushes seem pretty often to me. I am not sure if OP would be dinged especially when reporting a cruise control issue. Of course, it is the dealer...

Yep...

 

[On Iowa]

Your tranny's gonna take a dump on you.

 

[soybean]

Just pour a readily available bottle of transmission treatment in it and that very often cures such problems. If you have never added any fuild to it over those 50K miles you might just need more fluid. With any vehicle always do the easy(and cheapest) cure first.

 

[hawkmart]

Maybe I missed it but does it do the same thing when going up similar inclines and the cruise control is not engaged? It could be a cruise control module or sensor.

Transmission fluid change isn't due yet. Your manufacturer's service manual says 80k if used under 'severe' conditions like hauling stuff with it and such. Otherwise they should just be inspecting the fluid at every oil change after 80k. So you should be fine if anything needs to be covered under a warranty with your cruise control issue. The every 30k from google is from dealers and such that of course would love to service the transmission that often for nice fee.

 

[Jimmy McGill]

You need a new Flux Capacitor

 

[Jimmy McGill]

You need a new Flux Capacitor

I love it when Trad gets my bad sense of humor.

 

[StormHawk42]

I called to confirm this morning but we had all the fluids flushed at 50k miles a couple months ago. Set an appointment with the dealer later this month. Fortunately have wrap coverage up to 100k miles so if it’s something really serious, should be covered.