4Xe wont start - no clicks or codes

[pcsquared]

My '21 wrangler 4xe that started a few hours prior wont start now. Searched around but "wont start" is too broad of a phrase

JScan says battery is at 14.2v, no codes, panel has normal "press brake and hit start button" message but nothing happens.

Replaced key fob battery a while ago so think that's unlikely. Remote start double tap on the fob results in one flash of the blinkers but no attempt to start - no clicks or anything.

My best guess is aux battery but curious if other people have run into this.

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[TrentYoung]

4Xe doesn't have an auxiliary battery

 

[pcsquared]

4Xe doesn't have an auxiliary battery

Well, glad I didn't spend too much time looking into that then

 

[KIZEMAN]

Maybe try moving the shifter? Could be thinking it's not fully in park?

 

[alphawolff]

Disconnect negative terminal and try again. The scanner should have some codes if its an actual no start with a 4xe

 

[pcsquared]

Disconnect negative terminal and try again. The scanner should have some codes if its an actual no start with a 4xe

Yeah, in this case it seems like it's not even trying to start. I'll have to try that and a different fob later today since it's parked a few miles from me.

 

[kah.mun.rah]

Hopefully this isn't the case but my 4xe did that when it was a few days old. It had to be towed to the dealership where they had to wait for a pin number from the mother ship to reset the system. After the reset it worked fine. One reason why I would never take a 4xe off-road out of the range of a tow truck.

 

[pcsquared]

Kicking myself for not disconnecting/reconnecting the battery last night at 1am, but then again I didn't have a wrench on me. With no codes and no other indicators I figured that would be a waste of time!

Started right up after disconnecting/reconnecting the negative.

 

[alphawolff]

Hopefully this isn't the case but my 4xe did that when it was a few days old. It had to be towed to the dealership where they had to wait for a pin number from the mother ship to reset the system. After the reset it worked fine. One reason why I would never take a 4xe off-road out of the range of a tow truck.

For reference if anyone sees this post in the future, he's referencing a contactor welded shut DTC. They removed our ability to reset welded contactor DTCs as it's a massive safety issue. Star allows the contactors to be reset once before outright replacing the battery pack. A welded shut contactor means the battery cant ever power down, meaning the 400v system is always live.

 

[kah.mun.rah]

For reference if anyone sees this post in the future, he's referencing a contactor welded shut DTC. They removed our ability to reset welded contactor DTCs as it's a massive safety issue. Star allows the contactors to be reset once before outright replacing the battery pack. A welded shut contactor means the battery cant ever power down, meaning the 400v system is always live.

Thanks for the info. Is it something that I should be concerned about?

 

[alphawolff]

Thanks for the info. Is it something that I should be concerned about?

Nope, if it happens again you'll just get a new battery pack. It's mainly a safety issue for the technician, as the HV system shouldn't be opened during normal vehicle operation anyway. Could technically be an issue in a crash, though?

 

[THAW]

JScan says battery is at 14.2v, ...

A better metric for checking the status of the 12V CR[an]K battery using JScan is "Intelligent Battery Sensor State Of Charge" (in the Live Data for the Body Controller).

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