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Discussion Starter #1
I know that colder climates aren't ideal for a hybrid, but we've had ours for about 2 months now and I've got a decent feel for the Pachy, and what it should feel like. I've heard that the ICE will run more frequently in colder weather, but I wouldn't expect it to start and stop 3 times in less than 6 seconds. I like to drive while having the Hybrid Information screen visible and I literally both listened and watched it start / stop 3 times in 6 seconds while sitting at a stoplight with about 40% battery left in 30-35 degree weather. I didn't post anything the first time that I noticed it, but now I've seen it do this 3 different times. It seems to happen after it's been warmed up for 15-20 minutes or so and the battery has been used down to 40% from a full charge. I would think that starting the ICE that many times in succession, that quickly would not be healthy for the Pachy.

Has anybody else experienced this?
Should I be concerned?
Should I take it to the dealer to look at even though no check engine lights or messages happened?

Thanks in advance for your replies.
Stach
 

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Starting 3 times in 6 seconds is definitely not normal. See if it’s reproducible. If not you’ll have a hard time convincing your dealership especially if they can’t find a code. I would still raise a concern with them.


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We've noticed similar behavior on 2 occasions now. Not quite so quick, but quick. Pull to a light and ICE will stop. 30 seconds later it will start for a couple seconds then stop again. Process repeats a couple of times.

I have noticed 2 things:

- both times it did this, the van was in fuel and oil refresh mode.
- both times it did this at a light, if the ICE was stopped and I took any pressure off the brake pedal (or let off to creep) it would instigate the rougher-than-normal start up - and shut back down momentarily after stopping again.

I haven't had this issue when not in oil and fuel refresh mode.

It's like the drive train loses all refinement in refresh mode.

In the mean time, if we're in refresh mode I've been making sure to stay put at a red light and not creep and it's helped reduce the ICE stop/starts (but not eliminate it). I'm guessing climate control has a bearing on the stop / starts too as it does in normal use but can't say for certain.

Note: I have an early build 2018 and haven't been back to the dealer since we bought it. I have not had the PCM recall done yet. I'm somewhat hopeful the update will help. Going to have it done at it's first service in the next month or so.
 

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I've seen this problem too, this only happens when:
- Its cold outside, say below -5C
- The van has been running for about 15-20 minutes
- In Park and the ignition turned on
After a while the ICE quickly cycles ON/OFF for short periods (2-3 seconds).
Restarting the van makes it stop, I'm not sure if it stops on its own eventually, I think driving it might.

This has happened multiple times already, but I have not been to the dealer for it as I don't have that much time to spend.
I have a 2018 Touring Plus, all recalls have been applied.
 

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I've also had this happen at various times, mostly in cold weather and with a any state of charge level on the drive battery (85%, even 0% a few times when I've noticed it) and it happens even if the coolant temp is plenty high enough for cabin heat (170F or so). Our van is not in maintenance mode or anything, it gets enough ICE use to avoid those modes altogether. I consider it 'normal' and ignore it.
 

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Discussion Starter #6 (Edited)
If others are experiencing minor variations on the same theme as me, then I will consider it a "normal" software bug that should get fixed. I can only imagine that it's not healthy for the starter, ICE, and other parts to cycle on/off multiple times over the span of a few seconds. I've also been driving down the road on battery only (again in colder weather) and the ICE will kick on once for only 2-3 seconds. I find it hard to believe that it is doing anything useful for those couple of seconds. It's definitely not related to refresh mode as we commute and drive on ICE regularly, and I don't see any notification on the display about a Refresh.

So what's the best way to make Chrysler aware of this, so that it could eventually get fixed???
-Stach
 

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If others are experiencing minor variations on the same theme as me, then I will consider it a "normal" software bug that should get fixed. I can only imagine that it's not healthy for he starter, ICE, and other parts to cycle on/off multiple times over the span of a few seconds. I've also been driving down the road on battery only (again in colder weather) and the ICE will kick on once for only 2-3 seconds. I find it hard to believe that it is doing anything useful for those couple of seconds. It's definitely not related to refresh mode as we commute and drive on ICE regularly.

So what's the best way to make Chrysler aware of this, so that it could eventually get fixed???
-Stach
Maybe make @ChryslerCares aware of this issue?
I've experienced exactly the same thing and it doesn't seem like a 'normal' behavior to me as well.
 

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Sorry, my experience is in the cold as well. Forgot to mention that.

This makes me wonder more if it's the climate control (heat demand) in cold weather fighting the engine stop / start fighting fuel / oil refresh mode.
 

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Discussion Starter #9 (Edited)
Basically a similar experience last night. 36F degrees out, battery at 31%, sitting at a stoplight and the ICE turns on for 5 seconds, then stops, waits for 15 seconds, and then the cycle repeats itself until the light turns green and I start moving. I can't imagine that anything useful is being done by the ICE or to the ICE by running it for a whopping 5 seconds every 15 seconds while stationary in a not so unreasonably cold environment.

I did send a PM to @ChryslerCares, but so far have heard no response. If this condition is concerning to you, I recommend that you do the same to raise their level of awareness.

-Stach
 

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Basically a similar experience last night. 36F degrees out, battery at 31%, sitting at a stoplight and the ICE turns on for 5 seconds, then stops, waits for 15 seconds, and then the cycle repeats itself until the light turns green and I start moving. I can't imagine that anything useful is being done by the ICE or to the ICE by running it for a whopping 5 seconds every 15 seconds while stationary in a not so unreasonably cold environment.

I did send a PM to @ChryslerCares, but so far have heard no response. If this condition is concerning to you, I recommend that you do the same to raise their level of awareness.

-Stach
Good idea, I did PM @ChryslerCares as well.
 

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I've also had this happen at various times, mostly in cold weather and with a any state of charge level on the drive battery (85%, even 0% a few times when I've noticed it) and it happens even if the coolant temp is plenty high enough for cabin heat (170F or so). Our van is not in maintenance mode or anything, it gets enough ICE use to avoid those modes altogether. I consider it 'normal' and ignore it.
Just made a thread about this with video. Looks like the same issue. I don't recall this happening last year so looks to be an issue with an update(?).

https://www.pacificaforums.com/forum/433-2017-chrysler-pacifica-phev-hybrid-general-discussion/41279-lots-random-issues-lately-engine-start-stop-rear-climate-access-etc.html
Hi All,

We are sorry to learn that you are all having a similar concern with your Pacificas. Please provide your VIN and mileage in a private message so that we can document this on your behalf and see how we can assist.

Darlene
Chrysler Social Care Specialist
 

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Here is a video I took today of this behavior. The vehicle was warm and had ran for 20 minutes. It cycled the ICE 4 times within a minute, it had already done more before I started the recording.

Since U94 is related to engine sync on start, I find this behavior concerning.

https://youtu.be/vA7n5Tr_UFo
 

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That might seem odd to a non-engineer but without knowing how the computer was programmed it could be normal. For example, if the coolant needs to be warmed up and the powertrain controller expects to be running the engine occasionally, perhaps it's cycling it on for short periods to heat up the catalytic converters while using as little fuel as possible. So while it potentially could be operating in the most efficient manner for conditions, sometimes the calibration programmers that create and tune the software have to take customer experience like this into consideration. They might be able to "fix" the behavior and alter programming so the engine runs longer at a time, but it might give up some fuel and energy efficiency.

I haven't had my 2019 too long but I have seen some similar behavior that would seem odd for a normal stop-start system, such as cycling the engine on for a brief moment, off, and then a very short period of time later power it on again during light acceleration from a stop. I can make educated guesses as to why it's doing it but without reverse engineering the programming and logic or getting an engineering insider at FCA on here, we probably won't know exactly what's causing it.

That's not to say a sensor could be bad or there's something specific about your conditions that is causing it to do something it shouldn't that slipped through testing. If a lot of other owners report seeing the same thing I wouldn't worry about it and trust that there's likely a reason, even if it seems like there's excessive stops and starts. It might be emission related, efficiency related or something else.
 

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I understand there might be a reason from an engineering perceptive, but for a reasonably informed user, it looks kind of pointless.
That said I don't have more I could add, other make it known here and to FCA.

I'll consider this a normal behavior. Some on the Facebook group also hint that this might be newly introduced in the new PCM version.
 

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I take it as normal too, happens here in cold Toronto. I find it more annoying than worrisome. Starting and stopping an engine won't damage it in my mind, it may wear the starter brushes (the starter for this car doesn't sound like any starter I've heard before) - but maybe this starter is built for this kind of on/off. I leave the coolant temp on my dash and am trying to correlate a min. temp but so far no discernible pattern.
 
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