[JLH]

If that is normal for you vehicle after 24 hours, then you have a problem. I have let my 2020 Touring sit for over 15 days, no tender and it starts right up. SOC was down slightly but it was back to a full SOC with the drive I had to take.

When we were still going through the Covid lockdown, our Passport, which is pretty much just our road car, would often sit for 6-8 weeks at a time without getting started and never once even turned over slowly. I've never once since we bought it in Sept. of '21 had it on a Battery Tender. I do keep my Tiger Explorer on a Tender and my Cub Cadet Z Force S has a Tender hooked up to it from late November through March. Our Passport is the 4th 3.5L Honda since '06 and I've never had a charger or Battery Tender on any of them in over 300,000 miles. Zero issues.

 

[Bosetsu]

When we were still going through the Covid lockdown, our Passport, which is pretty much just our road car, would often sit for 6-8 weeks at a time without getting started and never once even turned over slowly. I've never once since we bought it in Sept. of '21 had it on a Battery Tender. I do keep my Tiger Explorer on a Tender and my Cub Cadet Z Force S has a Tender hooked up to it from late November through March. Our Passport is the 4th 3.5L Honda since '06 and I've never had a charger or Battery Tender on any of them in over 300,000 miles. Zero issues.

Really makes you wonder about the consistency of battery quality. I just changed my battery to a Duracell (made by East Penn) and noticed a more consistent idle start/stop compared to the OEM battery I had. Comparison between the two after the warranty update to the system. It could just be placebo though 🤷🏻‍♂️ I do see the new battery maintaining a higher voltage with barely any loss of charge checking with my multimeter.

 

[HarveyW]

Yes it is perfectly normal for the start/stop to self disable until the charging system catches up. If your vehicle sets 24 hours or 15 days you are going to experience this. The longer it sets the longer it will take for the charge system to catch up. A vehicle that's plugged in and has a full charge will rarely get the dash notification and the start/stop will work seamlessly.

I have 2 motorcycles and four 4 wheeled vehicles plugged in at all times when parked in my driveway and garage. Of course the ones that are driven throughout the day do not get plugged in until the evening. It takes less than 10 seconds to pop the hood and hook up.

I have no recommendations for a driver who has a problem with such an easy task. They will spend money and effort to install a device to disable the start/stop system when all it takes is a simple push of a button at startup. Yet will argue and complain about pushing a button or plugging in a pigtail. Makes zero sense.

It sat for 15 days and when I drove it, before it was charged up, the Auto Idle Stop functioned perfectly, so if your AIS disables after 24 hours with out being on a tender there is something wrong with your vehicle.

 

[jppelec]

Received this today in the mail. Also in a different Passport group people are receiving a different recall for the side view mirrors. Apparently the glass falls out of the mirrors.

 

[thezone3]

My dealer updated my PGM-FI software (Bulletin #23-008) during my usual maintenance stop last month. I cannot recall any situation or event while driving with this system enabled where I had to manually restart the engine.
According to the TSB, Honda tweaked the parameters on the Auto Idle Stop logic to engage the system less (or hardly at all) when the battery is nearing the end of its life cycle. Of course though, I wouldn't just assume they ONLY tweaked a parameter or 2. Including but not limited to ambient air temperature ranges.

Even with HVAC controls set to OFF, I couldn't get the system to engage on certain days or drive cycles. Tested in ambient temperature ranges from 23°F(-5°C) to 52°F(11°C) but I would take this conclusion with a grain of salt tbh.

Edited my reply because I just saw your post about TSB #23-009.

Honda Extending Warranty

This is from another Passport group. I received the same letter today.

www.passportforums.com

 

[PNWGarageDad]

Got my recall letter in the mail, glad I got the idlestopper device lonnng time ago!

 

[fx_chip]

Got my recall letter in the mail, glad I got the idlestopper device lonnng time ago!

Same here.

 

[HarveyW]

So glad I have had my idlestopper device for so-so many years now. Being one that dislikes uni-taskers, it has been helpful in ever so many ways. I actually have 10 of them, but this is the one I use the most.

 

[23Elite]

We just bought a '23 PP Elite. Do we have that letter to look forward to? lol

 

[fx_chip]

We just bought a '23 PP Elite. Do we have that letter to look forward to? lol

Considering the fact that this update was released in January your is likely updated from the factory. And just in case your Passport left the factory before the update, Honda instructed dealers to check and update vehicles on their lot before sale.

 

[kgilbertsen_1]

I just rec'd. the Warranty Extension letter today - that's a good thing 👍. I don't see anything directing me to have the software updated so I assume that is done on a case by case basis depending on what the dealer finds when the vehicle's in the shop.
Will a 'sytem warming up or charging' message be enough to have them update, or will they need to see a bad battery before they perform the fix?
In other words, do I need to stop disabling the Idle Stop every time I get in the car in order to have the software update done?

Today (20th) rec'd. another letter from Honda, this one for the PGM-FI Idle Stop Software Update. Stating to just call and get it done.
I wonder why they split this issue into 2 separate letters? They both talk about the 10 year warranty extension etc. Oh well..

 

[JLH]

We just received our 2nd one today also.

 

[BangBangBill]

Curious to know if the people who keep their PPs on a battery maintainer do that with all vehicles they own, lawn mowers, motorcycles, snow blowers, etc. I have an Idlestopper installed and my PP is only driven once or twice a week. The only time I have ever had an issue was a warning I got that actually prompted me to get the Idlestopper in the first place. I have never before had to keep a vehicle plugged in if I don't drive it daily. Having to do so would lead one to believe ther just might be an underlying issue. The issue I have perceived was corrected by the Idlestopper.

There are times where I am away from my vehicle for days at at time where no source of power exists, Camping, hiking, fishing, hunting, etc. Some of these activities occur during less than ideal conditions a battery will encounter.

My final thoughts are that a vehicle built by a manufacturer with the reliability that Honda is known for, that costs upwards of $50k should not have to be plugged in. All cars have quirks & weak points. I can fix it for a few bucks and 10 min so I did and will not worry about it any more. We all have irrational attachment to our cars and do what we think is the right thing. This is the route I took. It works great. For me. YMMV, FWIW, EIEIO, BR549 OU812.