2017 Santa Fe Sport

rjh1

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Location
Ohio
Make
Hyundai
Model
Santa Fe Sport
Year
2017
Miles
72,000
Engine
2.4 L
I may have asked this before ? But here goes. we have a 2017 santa fe sport 2.4L gdi. with the cruise control on and you start down a decline the engine races. But if your in manual mode it does not race the engine ? why does it race the engine in regular drive mode? Thank You in advance
 

billr

wrench
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Clarify: are there three different modes; "cruise-control", "manual", and "regular drive"?
 

rjh1

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normal is p-r-n-d then the gate moves to the right for shifting manual if you wish .. regardless of which you choose you can operate cruise control. in the regular mode the engine increases rpm when you go down hill . In the manual mode the vehicle coasts . why does the engine rpms increase in regular drive mode?
 

billr

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Can you view/log live-data? If you don't have a scanner that can do so, there are very inexpensive ELM327-type devices to connect the car to a PC, phone, etc. Your main expense will be the "learning curve" to use (free) software. I presume there are no OBD trouble-codes set.
 

rjh1

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Can you view/log live-data? If you don't have a scanner that can do so, there are very inexpensive ELM327-type devices to connect the car to a PC, phone, etc. Your main expense will be the "learning curve" to use (free) software. I presume there are no OBD trouble-codes set.
there are zero codes. . . . a scanner isn't going to do anything ? It have been that way since day 1 , dealer can't even give a good answer. no worries Thanks
 

billr

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Oh, you are saying it has been this way since it was new from Hyundai??? That may be simply a design "feature" or defect. Which, depends on whether you like it working this way.

Or, the dealer fed you BS way back then and it has been defective right from the beginning. I can think of no rational reason for having the engine change rpm more than the little bit needed to maintain the CC set-speed. Does the Owner's Manual mention this weird CC action at all?

Notice I said "rational" reason above. It may be that "feature" was a design necessity to meet emissions or CAFE mandates for this engine/vehicle

PS: with all the sensors and actuators that the PCM depends on, it would be a waste of time to try diagnosing this behavior, for either repairing it or just understanding it, without having live-data.
 
Last edited:

bob428

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Mine does the same. See below for explaination.

Engine braking hyundai cruise control​

Engine braking is a common feature in modern vehicles, including Hyundai cars equipped with cruise control. It’s a technique used to slow down the vehicle without using the brakes, which helps to reduce wear and tear on the brakes and improve fuel efficiency.
How Engine Braking Works in Hyundai Cruise Control
When you’re driving downhill or descending a steep slope, your Hyundai’s cruise control system can use engine braking to slow down the vehicle. This is achieved by downshifting the transmission to a lower gear, which allows the engine to slow down the vehicle without using the brakes. The engine braking feature is designed to work in conjunction with the transmission and the vehicle’s electronic control module (ECM) to ensure a smooth and controlled deceleration.
Is Engine Braking Normal in Hyundai Cruise Control?
Yes, engine braking is a normal and common feature in Hyundai cruise control systems. It’s a designed feature that helps to improve safety, reduce wear and tear on the brakes, and enhance fuel efficiency. Many Hyundai models, including the Santa Fe, Elantra, and Sonata, are equipped with engine braking capabilities.
When Does Engine Braking Happen in Hyundai Cruise Control?
Engine braking typically occurs when you’re driving downhill or descending a steep slope, and the cruise control system detects that the vehicle is losing speed. The system will automatically downshift the transmission to a lower gear to slow down the vehicle, using the engine to brake instead of the brakes.
Tips for Using Engine Braking in Hyundai Cruise Control
  1. Use it downhill: Engine braking is most effective when you’re driving downhill or descending a steep slope.
  2. Monitor your speed: Keep an eye on your speed and adjust your cruise control settings accordingly to avoid sudden braking.
  3. Use manual mode: If you’re driving in manual mode, you can use the clutch and gears to slow down the vehicle instead of relying on engine braking.
  4. Check your owner’s manual: Consult your Hyundai owner’s manual for specific guidance on using engine braking in your vehicle.
In summary, engine braking is a normal and designed feature in Hyundai cruise control systems, which helps to improve safety, reduce wear and tear on the brakes, and enhance fuel efficiency. By understanding how engine braking works and when it occurs, you can use it effectively to improve your driving experience.
 

billr

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Thanks for posting that. I don't agree that it is an altogether desirable feature, but the info you posted certainly makes clear for the OP that it is "normal" and how it can be expected to work.
 
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