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'21 Ridgeline RTL-E, '07 Ridgeline, '08 997TT
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I made an interesting discovery on my 2021 with regard to “idle stop”. If I’m stopped at a light and I’d like the engine to restart before lifting off the brake, all I need to do is move the steering wheel very slightly (1mm or so) and the engine fires right back up.
 

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Discussion Starter #22
Yes - that's one of many conditions listed in the Owner's Manual under "The engine restarts even if the brake pedal is depressed when:" :)
 

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Discussion Starter #23
zroger73 said:
Does the engine remain off during idle stop when shifting to park?
Now that I own a 2021, I can confirm that it does, thankfully.
 

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OK, start/stop behavior when shifting to P is odd. I am on a long road trip today and after pulling off of a few hours of driving continuously into a gas station, I stopped in a spot and the engine stopped. So I shifted to P and held the brake and within 3 seconds, the engine started again. I would think the battery SOC would be well above acceptable to stop the engine for a while. Engine temp was obviously at operating temperature. I am a bit confused by how it behaves.
 

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Just adding more notes with my experience on a 2021 RTL-E.

There is a logic behind it. Sometimes it remains off, in other instances, it will turn back on.
Something else other than the brake pressure is being considered by the ECU.
Maybe door opening, voltage, etc. Who knows what else.
 

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Discussion Starter #26
  • Idle stop off switch pressed
  • Driver's seat belt unbuckled
  • ITM selection is changed from "normal"
  • Steering wheel is turned
  • Vehicle speed exceeds 0.6 MPH
  • Brake pedal is released
  • Accelerator pedal is pressed
  • Brake booster pressure falls too low
  • Defrost button is pressed
  • Set temperature is too far above or below outside air temperature
  • Blower is set to maximum speed
  • Battery voltages falls too low
  • AC outlet is switched on
 

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That is a bit weird... I don't think any of those situations would apply if I just pulled off of a 2+ hour cruise on the freeway, pull into a parking spot, shift to P and lift off of the brake pedal. Odd, that.
 
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