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Old 10-16-2018, 03:50 PM
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ABS & Traction light & running poorly

I've searched, and even responded on other threads. The issue I am having is slightly different than any others I have seen.



When I first start my 2015 JKU, its fine. As I begin to accelerate to pull out of the driveway the engine bogs down, spits and sputters, then the ABS light and Traction control light come on. Sometimes the downhill grade green light comes on in the speedo cluster. I can sometimes hit the traction control button and it will start running ok, but the lights will be on. Other times, it will just eventually start running right on its own. Usually, the lights will go off on their own within a few minutes, but sometimes they never go off. I cleaned the two rear wheel speed sensors and it seemed to help it for approximately 2-3 days. I took them out again and they are still clean. Oriellys ran a scan on an OBD I and II with ABS and didn't show any codes even though the lights were on. Are there more speed sensors on the front wheels? They didn't look like the rear wheels. Any suggestions on how to get this sorted out? I made no changes to it or did anything to it when it started these issues. It has been lifted since new, and has had an amp, and backup camera for over a year. Thanks for any help.

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Old 10-16-2018, 05:43 PM   #2
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Yes, there is one on each wheel. Check the electrical connectors as well. It sounds like one has an intermittent fault that is messing with the signal, so that the computer thinks you have lost traction.



When that happens, it applies brake to the 'spinning' wheel, & if that doesn't help enough, it cuts power from the engine until the tyre regains traction. This sounds like what you are experiencing, except for the actual spinning wheel. Hence, suspect sensor.


Can you see if any of the wiring from then may have been pinched or chafed through? Or for a loose or dirty connector.

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Old 10-17-2018, 06:39 AM   #3
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First check the battery terminal clamps. Make sure you have no electrical accessories connected to the clamping nuts. Then make sure the clamping nuts are nice and tight.
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Old 10-19-2018, 09:09 AM
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Thanks. I'll check the connectors. The rear ones looked okay but I didn't pay close attention to them. The front ones are just completely different so I will have to look into how to get those sensors and connectors out.



I did disconnect my accessories and tightened the battery terminal. Didn't help.
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Old 10-19-2018, 09:46 AM   #5
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I know when my ABS and traction control lights were on after I did my lift and new brake lines, it went into "limp home" mode. Have you checked the ABS sensors? done any work to the Jeep lately?
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Old 10-19-2018, 07:58 PM   #6
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From memory, the connectors for the front ones are on the back of the shock tower, so you need to flex the plastic inner guard out of the way to get to them.
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Old 10-20-2018, 07:58 AM   #7
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My ABS and traction control lights came on yesterday when I pulled out from a stop. There was some sound in the rear when they came on. I got home 2 miles later and tried to read the codes using the ignition. It only showed dOne.

I plugged in my OBDII scanner and U140C showed up on the scanner. I went to www.CanOBD2.com and looked it up. Implausible Right Rear Wheel Speed Signal Received.

O'Reilly Auto Parts had the part in stock for about $22. An 8mm socket and ratchet, screwdriver to pry (break) that stupid red tab holding the sensor in place is all it took.. Went for a drive and the lights went out in 30 seconds. Fixed.

Oh, I called the local Jeep dealership to see when they could check the Jeep and the soonest available date was 29 Oct. That's crazy. 10 day wait?
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Old 10-20-2018, 10:11 AM
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It looks like some type of wire/hose/line goes directly into the front hubs. It then connects to some wiring behind the shock tower up high near the engine compartment. Do I need to take the hub off to get to the front wheel sensor? I would rather not. There is not a cotter pin and it looks like only one large nut is holding it on. I assume it will be pretty tight and I don't have a very strong impact wrench for taking it off or getting back on tight enough.
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Old 10-20-2018, 10:55 AM
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Nevermind. Took the wheel off, and brake caliper, then took off the rotor and could get to it. Didn't have to take off the hub
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Old 10-20-2018, 09:08 PM   #10
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That large one is the axle nut. The hub is held on by 3 12 point bolts on the back.
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Old 11-04-2018, 08:13 AM   #11
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Originally Posted by allikanbe View Post
My ABS and traction control lights came on yesterday when I pulled out from a stop. There was some sound in the rear when they came on. I got home 2 miles later and tried to read the codes using the ignition. It only showed dOne.

I plugged in my OBDII scanner and U140C showed up on the scanner. I went to www.CanOBD2.com and looked it up. Implausible Right Rear Wheel Speed Signal Received.

O'Reilly Auto Parts had the part in stock for about $22. An 8mm socket and ratchet, screwdriver to pry (break) that stupid red tab holding the sensor in place is all it took.. Went for a drive and the lights went out in 30 seconds. Fixed.

Oh, I called the local Jeep dealership to see when they could check the Jeep and the soonest available date was 29 Oct. That's crazy. 10 day wait?
Responding to my own info. So I put the new wheel sensor on and drove for about 20 seconds and the ABS and traction lights went out. All good until 2 days ago and the same thing happened. The crunching/griding sound from the right rear, loss of engine power, and ABS and TC lights back on. I removed the same sensor that I intalled about a week earlier and went back to O'Riellys. They gave me a new sensor for free. I installed it yesterday and all is good. Now the wait.
What would make the same wheel sensor fail in such a short time?
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Old 11-04-2018, 02:29 PM   #12
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Responding to my own info. So I put the new wheel sensor on and drove for about 20 seconds and the ABS and traction lights went out. All good until 2 days ago and the same thing happened. The crunching/griding sound from the right rear, loss of engine power, and ABS and TC lights back on. I removed the same sensor that I intalled about a week earlier and went back to O'Riellys. They gave me a new sensor for free. I installed it yesterday and all is good. Now the wait.
What would make the same wheel sensor fail in such a short time?
so, today, I pull out of the driveway and the grinding/crunching sound and engine rpm drop happens again. This time the sounds is coming from the front. I put my obd scanner on and nothing. The ABS and traction control lights are on, but there is no code showing. I drive to the local advance auto to see if they can read the code,but they only scan for engine codes. i pull out of the parking lot and more crunching/grinding sounds from the front and the engine loses power. I'll take it to the dealershp. Hopefully, they wont tell me its's a 10-day wait again.
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Old 11-13-2018, 05:31 AM   #13
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Have you checked to make sure the lug nuts on all 4 wheels are torqued appropriately?

A loose wheel could produce the noise and dash lights that you’re reporting.
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Old 11-13-2018, 02:33 PM   #14
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This is why I just joined this forum. My wife's Jeep has been nothing but a computer nightmare. This it the latest issue, we have the traction control light and throttle control light come on randomly about 5 times in the last month. Jeep starts missing like crazy and you have to coast off to the side of the road. Turning the ignition off and back on resets it and everything is fine, until the next time. It's a 2017 with 20k on it. Very frustrating.
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Old 11-13-2018, 10:34 PM   #15
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This is why I just joined this forum. My wife's Jeep has been nothing but a computer nightmare. This it the latest issue, we have the traction control light and throttle control light come on randomly about 5 times in the last month. Jeep starts missing like crazy and you have to coast off to the side of the road. Turning the ignition off and back on resets it and everything is fine, until the next time. It's a 2017 with 20k on it. Very frustrating.
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Old 11-14-2018, 01:58 PM   #16
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Originally Posted by WifeWantedaJeep View Post
This is why I just joined this forum. My wife's Jeep has been nothing but a computer nightmare. This it the latest issue, we have the traction control light and throttle control light come on randomly about 5 times in the last month. Jeep starts missing like crazy and you have to coast off to the side of the road. Turning the ignition off and back on resets it and everything is fine, until the next time. It's a 2017 with 20k on it. Very frustrating.
Hi WifeWantedaJeep,
I can imagine why this would be frustrating. If you decide to have your dealer look into this, you may also send us a private message and we would be happy to assist in having these concerns addressed.
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Old 11-19-2018, 12:59 PM   #17
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I hope everyone has solved their problems with this issue by now. I had something very similar happen to my 2007 Jeep Wrangler. ABS, Traction Control lights on, RPMs dropped, Jeep became hard to drive, etc. Tried replacing speed sensors and didn't solve the problem. I did some research online and it turned out I had a bad wheel bearing hub assembly. The large heavy wheels and tires we love to put on our Jeeps can cause accelerated wear on the hub assemblies. I considered it an easy repair job to do. Only special tool I needed to purchase was a 36mm socket to get the wheel hubs off. I replaced both of the front ones and it completely solved the problem. At $200 for parts I considered it an inexpensive repair. Of course this may not be the solution to your problem. I had a friend who was experiencing similar symptoms too and it turned our they had a loose battery cable that was the cause.

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