Low Voltage Issue on the 2.0L - Turbo Boost Lag

[Kidder212]

I think once the battery is at full charge 13.6 is a float charge. AGM batteries charge different and are more susceptible to failure if over charged. The 48v system has a DC to DC converter that charges in a step charge. If you watch the charge cycle you will notice first charge at 14ish then 13.8 and rests at 13.6

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[OffroadTreks]

Most vehicles just bulk charge their batteries with single-stage charging. I'd expect the BSG to actually be a smart charger.

When I do the winch, I'm adding a dual battery setup.

 

[Engmoreau]

I think once the battery is at full charge 13.6 is a float charge. AGM batteries charge different and are more susceptible to failure if over charged. The 48v system has a DC to DC converter that charges in a step charge. If you watch the charge cycle you will notice first charge at 14ish then 13.8 and rests at 13.6

My battery is at
12.7v when off
14v when engine running
13v during ESS

Is a dramatic drop from 14 to 12.7

Jeep has 8 months 16k miles.

 

[AnnDee4444]

My battery is at
12.7v when off
14v when engine running
13v during ESS

Is a dramatic drop from 14 to 12.7

Jeep has 8 months 16k miles.

This is nothing to be concerned with. A 12V system should measure around 12V with no load or not charging.

 

[JeepCares]

@JeepCares here is another buyer stranded in the woods. What’s the solution from FCA?

Hi Engmoreau,
Thank you for tagging us. We ask that anyone experiencing this please send us a private message and we'll gladly assist you in getting this inspected by your dealer.

Lydia
Jeep Social Care Specialist

 

[DesertFox]

This is nothing to be concerned with. A 12V system should measure around 12V with no load or not charging.

This is so not true! Fully charged the battery should run well over 13 volts.



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[OffroadTreks]

This is so not true! Fully charged the battery should run well over 13 volts.
.

That actually depends on the battery.

 

[FUHL]

This is so not true! Fully charged the battery should run well over 13 volts.



.

12.6 volts is nominal for a lead acid car battery. 2.1 volts per cell. Anything over that is a surface charge.

 

[Kidder212]

I believe all the new jeeps have AGM batteries in them, so the voltage should be around 13.2ish. AGM batteries also need smart charge technology to get the best life out of them. AGM has very low internal resistance so they don’t play well together with mixed battery sizes and types.

 

[Engmoreau]

So what would be considered low voltage in this vehicle? Trying to draw the land on the sand of when to be concerned

 

[Kidder212]

If it was me.......less than 13.6 I would be a little concerned. If I have the EES and AC going, the engine starts when the voltage drops to 13.1VDC and charges at 13.6-14.1VDC.

 

[Engmoreau]

If it was me.......less than 13.6 I would be a little concerned. If I have the EES and AC going, the engine starts when the voltage drops to 13.1VDC and charges at 13.6-14.1VDC.

I tested the ESS to see how quickly it will turned back on with the AC and radio on. It lasted over 3mins at 12.7v, it lasted the same as radio and AC off. I actually got tire of waiting and started the car.

So I’m still thinking what is considered a low voltage....

 

[Kidder212]

I also wonder how accurate the gauge is. The low voltage threshold my very a by a volt. Mine always restarted at 13.1 volts. When the engine stopped the voltage was reading 13.6 volts I really don’t trust automobile gauges much. It would be good to set up real instruments that measure voltages.

 

[Prowlers]

I want to know what accessories you guys are running and what other conditions were at play? I wheeled at altitude over 7500 in 4low for several hours this weekend and never did the voltage drop below 13.9 - there has to be a logical explanation for these issues. Especially the fact that something is draining down your batteries.

Also, are you running 38's there? You re-gear at all?

Accessories, 2 phone chargers, nothing else.
I'm geared at 4.11 now. Speedometer is programmed and I have no power loss only losing 1.5 mpg. The dealer pulled the codes and every sensor threw the 'Low Voltage'. I have not had an issue since then. Prior to this low voltage incident I was wheeling the same trail 25 days earlier and the day before this happened. I highly doubt a lift and 38s would cause this issues. It's been running excellent since. Moab and Buena Vista mid September.

 

[Prowlers]

For the past 6 days I have been in and out or 4lo and 4hi. I have noticed the my charge voltage has been around 13.6. I have have had no problems. As far as turbo lag.... I have been wheeling in northern New Mexico and Colorado and have been at 9000-11000 feet I can tell you there is some noticeable lag at those elevations. Take some getting used to. Once the turbine spools I do not feel any loss of power. I have traveled around 700 miles total in the back country of northern NM and Southern CO and love the turbo.

I love the turbo! Quick, 4Lows hard, I just pre-ordered the Mishimoto catch can which I believe is the lag junk issue. Weird my first crawl on Chinaman Gulch 1200 miles on speedo did great, then at the end of Wheeler Lake 9000 miles speedo my second trip is when I had to slightly rev to clear out the spent oil/fuel? Chinaman I was stuck in the Gulch! Jeep repaired itself. Currently have 12,001 miles. My voltage stays at about 13.6, 14.2 if I let'er sit a few days.

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