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Old 02-18-2014, 03:09 PM   #1
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Dash lights up like a Christmas Tree

Here's one for all you DIY mechanics and troubleshooters out there. I have a 2013 JKU with 6200 miles. About four months ago I started having an intermittent problem. What happens is the ABS, brake, and traction control warning lights flash on the dash. While that's happening the speedo drops to zero and then back to the rate of speed. Sometimes it will go 100+ miles without happening. Other times it happens every couple of minutes. I've seen this issue in other threads but there is never a definitive answer.

Today while driving this happened numerous times. When I plugged in my SuperChips I got the following error codes.

P0573 Brake Switch 1 Stuck Off
U1412 Implausible Vehicle Speed Signal Received
U1408 Implausible Brake Signal Received

Has anyone experienced this before? Some assistance would be greatly appreciated. The next step is to take it to the dealership. Like everyone else, that's the last thing I want to do.
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Old 06-25-2014, 06:43 PM   #2
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Did you ever figure out what was the cause and what to fix/replace?

This problem just began today with me in my 2012, exactly how you described it.

Thanks

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Old 06-25-2014, 09:14 PM   #3
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Just a question for ya...Did you happen to jump or pull power and or splice into any power source to power any mods or lights maybe? These JK's have computers and sensors detecting voltage drops?? You should never jump power off a hot lead!!!
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Old 06-25-2014, 09:42 PM   #4
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Quote:
Originally Posted by AndrewsJeep View Post
Just a question for ya...Did you happen to jump or pull power and or splice into any power source to power any mods or lights maybe? These JK's have computers and sensors detecting voltage drops?? You should never jump power off a hot lead!!!
I just run everything off of my battery, no splicing into the CANBUS for that exact reason. I got error codes P0573 and U1408... disconnected both battery terminals for 15 seconds, reattached and took it for another drive. So far so good, so we shall see. It's never done that before though...it's just out of the blue.
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Old 06-26-2014, 06:44 AM   #5
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If that happened I would take it in I connected KC lights just wired to the Battery and a body ground and mine went nuts about a month later and would not start had to have it towed to dealer tech said it was a bad battery my wiring had nothing to do with it just a bad Batt from fact if you wired it like you said I would have no problem taking it in that sort of elect problem would scare the hell out of me WHATS NEXT & WHEN after Warrantee is over not on my dime . good luck and keep us updated.
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Old 07-09-2014, 08:37 PM   #6
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It is a ground issue - I think

I had the same exact problem, and was told to take off my battery wires, and use a pair of pliers to "crush" (attach firmly) the wire connectors. Reattach wires to the battery securely.

I'm starting to see a lot of people reporting this problem. How do we start an effort to have Jeep issue a recall to fix it? I took my 2012 JKU to a dealership and they had no idea what it was.

Let us know if this fixes your problem. It worked for me.

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Old 07-20-2014, 02:12 PM   #7
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I was trying to find the thread that helped me when I had the Christmas tree dashboard. It had a link to an external site that stated that a loose negative terminal appeared to be the culprit. I went to the dealership to see if there were any codes and mentioned what I had read. One of the advisors was actually experiencing the same issue. He hadn't figured it out yet and said he'd lose his mind if a loose negative terminal was the cause. A tech came out and was extremely skeptical. Guess what... yeah, my terminal was barely finger tight if that. He said he still didn't believe it was the problem and checked for codes. There were two and I have it printed off and in the glove box. Something like an overcharging or something.. I forget. Main reason I'm posting is that the problem hasn't happened since the terminal was tightened. That was about a month ago. The problem was frequent over the two previous days so I'm confident that it's been resolved.
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Old 07-22-2014, 10:45 PM   #8
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The link you were looking for is on my blog.
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Old 07-22-2014, 10:49 PM   #9
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I had the exact same problem as the OP. I disconnected the battery cables for 30 mins and checked all the ground wires were tight. It's been 3 months and not another issue.
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Old 07-23-2014, 09:55 AM   #10
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Quote:
Originally Posted by scottmphoto View Post
The link you were looking for is on my blog.
Yep! That's the one! Thanks for the help and I'm sorry that I didn't note where I got the info.
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Old 08-19-2016, 01:26 PM   #11
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Resurrecting an old thread.

I've been having this issue off and on for the last few weeks. Finally put it on the chip reader and pulled the codes. Went to my Chilton manual and got thoroughly overwhelmed thinking I've got a wiring issue after the battery between the PCM and ABS Module. Googled again, found this thread and think I have the answer now. Will be checking all the battery connections tonight when I get home.

I do love fixing junk myself rather than have the dealer give me the three visit shuffle playing poke and hope to get me on the road, all on my dime. Knowledge is power people.
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Old 08-19-2016, 09:54 PM   #12
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I had similar issues with about 7k on her about three weeks ago. It was that the alternator was making too much juice. Dealer replaced alternator and fixed the problem.
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Old 08-20-2016, 11:56 AM   #13
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As alluded to in the various resolutions, it's either alternator or battery. I had a battery going bad and had this issue and it also ran very oddly where I couldn't get it to keep going down the road. Bad battery. Got a ride to the store, bought a new AGM battery, and 10min later problem solved

One thing I learned is for vehicles that sit for a week or more at a time between use is to put a smart charger on the battery to keep it healthy. Did this to a Harley and the battery was still good 9yrs later when I sold it. YMMV. I've done the same to my Grand Cherokee and that stock battery with a 2010 build date is still rock solid. My Wrangler sits for a week or two at a time, sometimes longer, and that's what killed my battery because I never put a smart charger on it when it sat (never got around to it). Smart charger on it now.

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