Scotty - Thanks for your efforts - love your channel and the information you provide. I have a 2017 Sonata hybrid, that got the advertised 41-43MPG. When I brought the car to the dealer for a warranty repair (exhaust pipe flange failure), they installed their Engine Monitoring Logic (Campaign 966) due to pre-mature engine failures. When I got the car back, I had noticed major changes (engine runs 95% of the time, battery charging profile much different/keeps it higher, etc) and I now get 30-33MPG. I brought it back to the dealer three times with the request that they provide the car back to me in the condition they got it (41-43MPG). Their current response is that the car scans ok/nothing they can do with no failure codes. Any suggestions greatly appreciated. Thank you, Hank W.
You may take it to another dealer to check the car, but some people mentioned similar symptoms that you have after getting the recall done:
If they refuse to do anything you could always try to contact corporate. Unfortunately if nothing is showing wrong you might not get any where.
I wonder if the engine monitoring logic intentionally keeps the engine on 95% of the time, to prevent premature engine failure.
Yea, that’s probably what the monitoring logic update does. Just to add prospective on how keeping it running longer can help avoid damage: On many Hyundai-Kia Hybrids the engine would never reach operating temperature and would develop all kinds of different failures. (for some reason, they do not have a system that’d keep the engine oil at op-temp)
Also unlike Toyota with integrated motor-generators - Hyundai-Kia have one of the Motor-Generators in place of the alternator spinning up the engine for start using the accessory belt… this probably does also cause quite a bit of additional wear… (at least on the Kappa II power trains)
I genuinely see why keeping the engine running can help improve longevity. It’s a shame, I had very high hopes for their hybrid tech but as it seems - Toyota are the only ones that got it 100% at the moment.
Fascinating.
As it seems, Hyundai decided that’s what necessary to help avoid premature engine failure.
If you really want that 10MPG back, I’d try calling Hyundai dealerships to find one that’s willing to do a software downgrade although they’re probably not allowed to do that.
