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ABS & ESP lights on and Hill Descent flashes at start

18K views 33 replies 6 participants last post by  jagerhelix 
#1 ·
Hey guys. Anyone seen this? The ABS & ESP lights are on constantly and the hill descent icon flashes 5 times then stays out.

In the vid I turn key to accessory, let it clear the other lights, then start it at ~10secx
https://youtu.be/DCdsL00vWHI
 
#2 ·
Oh yeah, I pulled the neg battery for about an hour - still does it.
Went to Advanced Auto and they stuck the OBD reader on it - no error codes.
 
#5 ·
I had the exact same issue in my 2014 JKU sport and it was the passenger side rear wheel speed sensor. Have an auto parts shop pull the code and I bet you it's one of the 4 wheel speed sensors. The rear sensors are pretty much in the open and fail very regularly. A failing front one on a 2014 might mean you've got a bad seal in the hub as they're protected way back inside there.

I ruined the stock connector trying to disconnect it so I ended up having to buy the sensor and connector, so be careful about breaking the little plastic retaining clip when you remove it if you're doing the work yourself.
Thats what I wa thinking, but the Advanced Auto OBD reader didn't come up with any codes. I will try another place and all else fails the dealership
 
#4 ·
I had the exact same issue in my 2014 JKU sport and it was the passenger side rear wheel speed sensor. Have an auto parts shop pull the code and I bet you it's one of the 4 wheel speed sensors. The rear sensors are pretty much in the open and fail very regularly. A failing front one on a 2014 might mean you've got a bad seal in the hub as they're protected way back inside there.

I ruined the stock connector trying to disconnect it so I ended up having to buy the sensor and connector, so be careful about breaking the little plastic retaining clip when you remove it if you're doing the work yourself.
 
#9 ·
You need a shop that has a reader that reads abs codes. I've run into this several times when trying to determine which sensor is out. I had good luck at autozone. Although you may have to ask them to check abs as some of the "techs" may not be aware of this. Speed sensor costs around 25 bucks from the dealer.
 
#10 ·
You need a shop that has a reader that reads abs codes. I've run into this several times when trying to determine which sensor is out. I had good luck at autozone. Although you may have to ask them to check abs as some of the "techs" may not be aware of this. Speed sensor costs around 25 bucks from the dealer.
This. Not all the readers will read ABS codes. The girl at Autozone reading mine at first didn't find anything. But then she found the ABS section on their scan tool and they showed up.
 
#14 ·
Did the hold the trip reset button then ignition trick and got:
C124.7
L91.5
cF.9

The three switching of the ign on/off don't work, I googled it to death
 
#18 ·
OK got a INNOVA reader (does ABS).
Top on is from the DTS and the bottom is the ABS sections


Replaced the passenger rear sensor and did a reset via the reader and still comes on.
Drove about 20 miles to see if it takes time, still does it

Question when they say Right are they talking passenger (as in driver seat) or driver (looking from front)?
 
#19 ·
Right rear means the rear passenger side wheel on a LHD vehicle

"implausible" means the computer is seeing a wheel speed at that tire that does not match what it feels are appropriate compared to the other 3. That code is set by the TCM. The other code is set by the PCM I believe. My guess is that you didnt clear the code correctly.

Another possibility, I have not heard of it happening on a JK, but inspect the tone ring as best you can. Pull off the sensor with the tire off the ground and have someone spin the tire while you look inside the hole with a flashlight.

How did the old speed sensor look? was the end chewed up?

This is basically what is going on under there.
 
#20 ·
Right rear means the rear passenger side wheel on a LHD vehicle

"implausible" means the computer is seeing a wheel speed at that tire that does not match what it feels are appropriate compared to the other 3. That code is set by the TCM. The other code is set by the PCM I believe. My guess is that you didnt clear the code correctly.

Another possibility, I have not heard of it happening on a JK, but inspect the tone ring as best you can. Pull off the sensor with the tire off the ground and have someone spin the tire while you look inside the hole with a flashlight.

How did the old speed sensor look? was the end chewed up?

This is basically what is going on under there.
]

Thanks for the info, esp the pic! When I used the reader to clear the code, I saw the idiot light saying BRAKE light up and I think a ding or beep. I'm just going to unhook the battery over night and see whats happens

Here is the old sensor, part number matches
 
#21 ·
I had that same implausible speed code when mine went out. After replacing the sensor it was still on. I had broken the plastic retaining clip on the harness so it wasn't getting a good connection. Did everything go back together ok? Did you unhook the battery while you were installing the new sensor? Any issues with the clip on the factory harness? Might just reach under there and give the harness a pull to see if it's connected securely.
 
#26 ·
Yea, when I was building my ABS system, I used a bluetooth reader and torque pro. It is able to show wheel speed in real time. All I had to do to verify that a sensor was working was disconnect all the other sensors and turn the hub. I just set my cell phone on the ground and watched the speed as I turned it. If I got a speed that was consistent with how fast I was rotating it, I knew it was good.
 
#27 ·
The reader will do real time mph, but I dont know where it picks its source from. Since there is 2 rear speed senders, I think it would be from somewhere else.
 
#28 ·
It gets it from the computer, the same place the dash gets it. Unplug all 3 other sensors and it should show speed of that sensor only.

It takes 1 working sensor to show speed, 3 working sensors for the transmission to shift properly, and 4 working sensors to have no crazy lights on the dash.


but really if it is under warranty, let them deal with it.
 
#31 ·
Got to the bro-in-laws garage and tried some more troubleshoolting
Wheel & rotor off, no broken teeth or super dirty


Jumpered the sensor end


went to the ABS module and got a 11k ohm reading (seen on net somewhere 9-13K is good)


lil vid of the sensor and ring in action
http://youtu.be/1cVjiUIRg1Y


Still have lights going to check the codes shortly
 
#33 ·
Well Willy is fixed. About 3 times since this all started, while driving the hill decent light would come on and the Jeep would stutter once or twice. Anyway, there was a pinched wire "around the gas tank" and it finally broke. The dealership did the work under warranty. So Willy is right again!!

Thank to all the posts and information from ya'll!
 
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