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Hello!

Temps have fallen in Idaho as winter is approaching. I park my 4xe in the driveway overnight so it is exposed to whatever the temperature is outside. Last week the temperature was down in the upper 20's. The jeep was fully charged when I remote started it. The gas engine started up right away and stayed on for what seemed like 15 plus minutes as the windows slowly defrosted. I figured that it was using a lot of power to preheat the cabin and defrost the glass so it needed a boost from the gas engine. I'm not happy with this function. I bought this vehicle to feel a bit better about my impact on the environment. Seeing it spill exhaust in the cold morning air puts an exclamation on my dissatisfaction with this process.

I decided to leave the 4xe plugged in overnight so the next morning when I remote started it there should be no issues with battery load as it is still hooked up to our home. Just for note, we use a level 2 charger for the Jeep. However, the same thing happened as the gas engine fired straight up. So I want to know if there is a solution for this or do I have to deal with my vehicle spewing exhaust every winter morning as my car defrosts. This would be a total bummer.

I reached out to Jeep customer care but they had no idea what I was talking about and had no place to send me besides our local dealership who I have found to know little about the 4xe when I have questions.

Hopefully, there is a jeep 4xe program engineer out there that might weigh in on the question.

Thanks
Hi there.... have a somewhat similar situation. Have had my Jeep for about two weeks. Love it...except for...I can start in hybrid and electric and go until the motor kicks on - either through acceleration or battery depletion, and then the motor never turns off - even when in hybrid mode, and at a stop sign. Further, it will not let me go into electric mode after the motor has kicked on. I'm also getting the fuel and oil refresh, though I "thought" it would fix itself after I fueled up yesterday. Same results. I can get it to go back to electric mode if I turn it off and back on, but that's a pain, and not why I purchased the 4XE....

Fortunately, I have a great dealership to work with. Salesman came down last night and rode with me, so he could see what the problem was. Have an appointment with the dealer next week to have them look at it. Will report back. Anyone have similar events happening? It has gotten a little colder in Northern Utah the past week....so it's possible that has some impact. I just don't know at this point.
 

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@Sjbiss Thanks for pointing us towards that very informative article. After reading these were my takeaways. I do have a fairly fresh tank of gas and I recently changed the oil so there should not be any issues with fuel or oil refresh. With the typical distances, I drive per week, I usually run into the ICE starting at least once a week as well.

@Grimmjpr mentioned he is dealing with the same mid-20s outside temps then remote starting and he's not having the vehicle kick into ICE mode. I'm curious what the situation is for him.

It's very curious and again I can't understand why the engine needs to fire up if the jeep is plugged into a level 2 charger during warm-up.
My 4xe has a little over 2k miles, I have a little over 1k miles on this tank of fuel that was filled on Oct 2nd, 110 miles hybrid the rest electric. I plug into my Level 2 Grizzl-e classic after work and usually don't unplug till I'm leaving for work the following morning, some round town driving on weekends then plugging in. I don't charge at work, or any other places. Oil life is showing 75 percent I think. I took delivery September 17th. In my daily commute I use electric mode. Any hwy driving or high speed driving I run in hybrid. HTH
 

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Let me share what i noticed and what would be a nice feature (Jeep are you listening?). Over the past few days I have been in Fuel and Oil refresh, and surprise, surprise the average mileage appears to be better than the pure hybrid mode (no refresh), while keeping the electric almost topped off after a 16 mile commute (93% batt remaining from 98, and avg 25 mpg). Would love to invoke the Fuel and Oil refresh programming mode and use it as a long trip hybrid mode. Add this as another E Save option to select from. "Long distance driving E-Save"
Thoughts?
 

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This is directly from Dan Fry one of the brains behind the insides of the 4xe which he posted on the Facebook group Jeep 4xe Fans.

Cold Weather Operation of the Wrangler 4xe

Remote start and regular button start will both work, with an EVSE plugged in. That’s a great way to warm the battery and the cabin using energy from the wall. The Jeep will not shift out of Park until you remove the charge handle, to prevent accidentally driving off while plugged in. The plug icon in the cluster gives you a heads up.

You might see Fuel/Oil Refresh more frequently in cold weather. That’s because short engine runtimes in cold temperatures are most conducive to fuel dilution into the engine oil. If this happens, the solution is to get the engine warm and keep it running for up to an hour and a half to evaporate the fuel out of the oil… or change the engine oil.

Here’s what to expect as mornings get colder. All of this logic is true, whether an EVSE is plugged in or not:

Above ~32°F, and with sufficient battery and fuel, the vehicle will usually power up silently (ICE not running). The exception is if you have a very high HVAC demand.

Below 32°F but above 10°F, the ICE engine will also run at startup. You can select Electric mode to shut it off, relying instead on the electric heaters. There will be a range penalty. If you use remote start in a cold garage, take note exhaust will be emitted.

Below 10°F, the engine will always run until various systems are up to operating temperature. Electric mode will be unavailable during warmup. At these temperatures, the electric heater really isn’t an efficient way to heat the cabin, and your EV range would be greatly reduced by that anyway. The same is true of BEV’s, but they don’t have an ICE to help.

If it’s below ~5°F outside when you shut down, the instrument cluster will advise you to plug in an EVSE to maintain battery temperature. This is only strictly necessary in case the battery temp falls below -20°F overnight. Level 1 or Level 2 are suitable.

All the way down to -20°F, the Jeep can start unassisted (without an EVSE connected). This is the same capability as other Wranglers and most ICE vehicles.

If outside temperature is likely to fall below -20°F, you definitely want to connect an EVSE overnight. The Jeep will wake up periodically and warm and circulate coolant to facilitate a restart. It’s not necessary to also connect a block heater.

With an EVSE connected, the Jeep can start as low as -40°F. This is the same performance a other Wranglers and the best production ICE vehicles - they require block heaters in these temperatures.

Happy Snow-Jeeping! 🙂
 
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