# Automotive “Start/Stop” Systems -? **URL:** \ **Category:** Factual Questions\ **Created:** [June 18, 2025, 10:33pm UTC](https://boards.straightdope.com/t/automotive-start-stop-systems/1019820 "2025-06-18T22:33:48Z")\ **Posts on this page:** 6\ **Page:** 4
**Author:** ![N9IWP](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/n9iwp/32/3154_2.png) [@N9IWP](https://boards.straightdope.com/u/N9IWP)\ **Post date:** [June 20, 2025, 10:06pm UTC](https://boards.straightdope.com/t/automotive-start-stop-systems/1019820/61 "2025-06-20T22:06:15Z")
> [@Crafter\_Man](#): > > Let’s say you have the air conditioning on, and you’re stopped for a while. Will it automatically restart the engine if it senses the cabin temperature increasing? Depends on the car – I’m almost certain later model Priuses have an electric compressor for A/C. Eventually the battery will get low enough and the ICE will start to charge. Also worth mentioning that in the Prius (and similar systems) the ICE doesn’t just come off when stopping, it could also not run when going down a hill. Motive power is constantly switching between electric, ICE, or both, and the ICE can be moving the vehicle and/or charging the battery. The ICE is (I think) sped up considerably more than most ICE starters before ignition. Brian ---
**Author:** ![FinsToTheLeft](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/finstotheleft/32/2930_2.png) [@FinsToTheLeft](https://boards.straightdope.com/u/FinsToTheLeft)\ **Post date:** [June 20, 2025, 11:25pm UTC](https://boards.straightdope.com/t/automotive-start-stop-systems/1019820/62 "2025-06-20T23:25:07Z")
> [@hogarth](#): > > Hybrid diesel-electric buses are relatively common in Toronto (but there are still lots of pure diesel buses in service). And some full EV. I believe the diesels are all slated for retirement over the next few years. They also promised to electrify the UP Express since it opened but it remains a diesel service. ---
**Author:** ![pirviii](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/pirviii/32/3233_2.png) [@pirviii](https://boards.straightdope.com/u/pirviii)\ **Post date:** [June 21, 2025, 2:52am UTC](https://boards.straightdope.com/t/automotive-start-stop-systems/1019820/63 "2025-06-21T02:52:30Z")
The only time I notice is when I’m trying to squeeze into traffic and I need to move fast. The slight delay has almost caused me to crash. The same move when I turn the ASS off is no problem. ---
**Author:** ![bob\_2](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bob_2/32/3341_2.png) [@bob\_2](https://boards.straightdope.com/u/bob_2)\ **Post date:** [June 21, 2025, 8:48am UTC](https://boards.straightdope.com/t/automotive-start-stop-systems/1019820/64 "2025-06-21T08:48:50Z")
> [@Crafter\_Man](#): > > Let’s say you have the air conditioning on, and you’re stopped for a while. Will it automatically restart the engine if it senses the cabin temperature increasing? That’s what happens with mine. ---
**Author:** ![Bullitt](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bullitt/32/5725_2.png) [@Bullitt](https://boards.straightdope.com/u/Bullitt)\ **Post date:** [June 21, 2025, 12:26pm UTC](https://boards.straightdope.com/t/automotive-start-stop-systems/1019820/65 "2025-06-21T12:26:24Z")
> [@Crafter\_Man](#): > > Let’s say you have the air conditioning on, and you’re stopped for a while. Will it automatically restart the engine if it senses the cabin temperature increasing? > [@LSLGuy](#): > > Yes it will. Need for heat, or AC, or need to move the car. Any of the three will restart the engine. > [@Crafter\_Man](#): > > That’s what happens with mine. Same here. Mine’s a Subaru. Seems to be the standard behavior. ---
**Author:** ![Marvin\_the\_Martian](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/marvin_the_martian/32/2898_2.png) [@Marvin\_the\_Martian](https://boards.straightdope.com/u/Marvin_the_Martian)\ **Post date:** [June 21, 2025, 2:40pm UTC](https://boards.straightdope.com/t/automotive-start-stop-systems/1019820/66 "2025-06-21T14:40:34Z")
My Jeep even gives a dashboard message telling me that start/stop is disabled due to cabin needing cooling. [Previous page](https://boards.straightdope.com/t/automotive-start-stop-systems/1019820.md?page=3)