11th Gen Civic Forum banner

[SOLVED] - Auto start stop not working on '22 Civic Si

15K views 28 replies 15 participants last post by  cryptolime  
#1 ·
I was travelling for a month which meant my 2022 Civic Si was left in my garage (in hindsight I should have disconnected my battery before leaving). After coming back, I noticed the auto start stop wasn't working. Maybe the battery had discharged quite a bit, but after a week of driving it still showed me the "System is warming up or charging" whenever I came to a stop. My battery also read 14.5V when the engine was on and 12.6V with the engine off, so it could not be a bad battery. Did some quick research online and someone on the older forums suggested to disconnect the battery for 10-20 seconds so that all the electronics/ECUs can reset, since the BMS might be having calibration issues.
I tried that, and voila!, the start stop started working again!
Putting this on a post to this forum in case anyone else has a similar issue with any electronics/calibration. The good old "turn it off and on again" solution just works sometimes. ;)
 
#3 ·
Lol, I forgot that some people hate that feature. Idk, try not driving it for a month and see what happens 😆. I'm curious though, do you not like it because it turns the engine off too often?
You could just drive it in sport mode too, but I don't know if the car remembers it should be in sport mode when it turns off.
 
#5 ·
Sport mode is not "remembered" between starts.

Auto stop/start is a relatively seamless feature with the CVT, but with a manual it can be annoying when it kills the engine JUST as you stopped for like <1 second.

Especially if it kills the engine with the clutch pedal halfway down, like if I had shifted into neutral with the engine idling to coast to a stop at a red light, but the light turned green exactly as I came to a stop. So I clutch in and shift into first gear, just as the auto kill says "hey, you came to a stop! kaput".

Now I have to release the clutch and press down again "from the top" - if I just continue pressing the clutch pedal down, the engine is still dead and I freak out!
 
#6 ·
In the CVT there’s a very easy Stop/Start bypass. Simply don’t press the brake all the way down when stopped. You can hold the car still without pressing the brake fat enough o engage stop start. This is because stop start won’t engage unless there’s enough pressure in the brake booster or something like that. If I stop and know the light is changing or about to change, I just don’t press the brake far enough to engage stop start

Not sure if this is the same trigger for the manuals but worth a try if you really hate it. Probably an easier habit to form than remembering to turn it off every time
 
#13 ·
I love when people push big numbers as a scare tactic, or outright misinformation instead of just saying "I just don't like how it feels". Stop start systems have been around for over a decade now, nothing to be afraid of from a reliability standpoint if you actually understand how the components are designed to work with the system
 
#14 ·
I don't like that it stops the engine in the middle of parking or the delay at a stoplight when it turns green and the guy behind me taps my bumper and I don't like that the thing that's hardest on the engine and oil pump happens more than it absolutely has to. It's government-mandated emissions standards that are forced down our throats.

I also don't like people who insist that auto start stop isn't harder on your engine and starter and battery, when the Auto Start Stop Starters had to be completely re-engineered because a standard starter would be worn out so soon. And people who say that it's not harder on a battery when virtually every maker had to upgrade the cold cranking amps and switch to AGM batteries because of the additional demand ASS puts on a battery. So, what we end up with is far more expensive starters and more expensive batteries because of the toll that ASS puts on the vehicle.

And that's just a few reasons I shut of the damn ASS. Every. Single. Time. The only cars that should have auto start stop are all-electric ones. But go ahead and enable yours. It's a free country. Mostly.

The Auto Start Stop reengineered starter
 
#23 ·
FYI: The manual states:
"ASS" (that's funny).... will not engage if:

  • The driver’s seat Auto belt is not fastened. (sitting in car not driving)
  • The transmission is in a position other than “D.” (sitting in car not driving)
  • Engine coolant and/or transmission fluid temperature is too high or low. (engine needs to cool it or heat it up)
  • The vehicle comes to a stop again before vehicle speed reaches 3 mph. (slow rolling stop/go traffic)
  • The battery state of charge is low, or the battery temperature is low. (needs charging)
  • The climate control system is on and the outside temperature is very cold. (personal comfort)

IMO, I don't think it's good overall for the engine even though engineers have re-designed the known components that are affected (starter, better battery and alternator, crank shaft bearing). Also probably not good for all the electronics/sensors that are needed for the new safety features being turned on and off or getting a voltage surge all the time.

I installed Idlestopper and it works great. I live in a big city and turn the "ASS" back on when in heavy traffic or when I feel it's appropriate.
 
#25 ·
I got used to it on my last vehicle (‘22 Jeep Cherokee). I didn’t mind it for the most part, except for the times when I’d forget to give it that extra half of a second to fire back up before trying to takeoff at a stop light. I don’t have to really worry about it in my Si. I always put it in sport mode which disables the feature anyways.
 
#26 ·
If I don't drive for a couple days I connect a Batteryminder to keep the battery charged. That seems to disable the auto start stop. The car says ASS disabled due to temp/charging until I disconnect the battery to reset the ecu. Seems to happen every time after charging for 5 days. Guessing the pulsing voltage from the desulphator is causing it.
 
#27 ·
I've had my 23 Civic for just over month, with just about 610 miles. Today for the first time I did get the error message of 'Idle Stop Temporarily Unavailable etc.' Black Beauty was only sitting for two days, I was doing errands while I noticed this message, I have always turned off the idle stop each time I start the car, which was off at the time of the message in which I was surprised to see the icon. I had only driven approx three miles who know, it may of been on sooner without my seeing till now, I did stop by the dealer, battery was tested all was O.K. After I left the dealership just after three-four miles the auto stop was working again. I even triggered the warning message of (To activate Idle Stop step on the brake completely). The SA did say it maybe temp related. It was a sunny 75 degrees outside, but inside the garage it was cooler around 65, but it has been cooler inside when outside is lot cooler.
 
#28 ·
I was travelling for a month which meant my 2022 Civic Si was left in my garage (in hindsight I should have disconnected my battery before leaving). After coming back, I noticed the auto start stop wasn't working. Maybe the battery had discharged quite a bit, but after a week of driving it still showed me the "System is warming up or charging" whenever I came to a stop. My battery also read 14.5V when the engine was on and 12.6V with the engine off, so it could not be a bad battery. Did some quick research online and someone on the older forums suggested to disconnect the battery for 10-20 seconds so that all the electronics/ECUs can reset, since the BMS might be having calibration issues.
I tried that, and voila!, the start stop started working again!
Putting this on a post to this forum in case anyone else has a similar issue with any electronics/calibration. The good old "turn it off and on again" solution just works sometimes. ;)
That's a great tip you shared, and it's amazing how sometimes the simplest solutions end up working wonders. Reminds me of my own story with my 2020 Mazda. I went for a two-week camping trip and left my car in an outdoor parking. On returning, I faced a similar issue with the infotainment system - it simply wouldn't boot up correctly. Checked all the fuses, connections, and even contemplated going to the dealership. However, before doing that, I decided to disconnect my battery for about 5 minutes. Reconnected it, and everything started working smoothly again. It's quite baffling how our advanced vehicles can sometimes be fixed with old-school tricks.

For those curious about the impact of the auto start-stop feature on battery life, I created a comprehensive article on that subject. Head over to my website CarzSpot.com to get a detailed understanding.

It certainly cleared up some myths for me. :D