ABS and brake lights on dash, and.....

woodtick · **Posted:** Sat Oct 25, 2014 9:40 am

So yesterday I ran a couple places after work, and the brake and ABS lights lit up on the dash. I parked for a while, came back and drove off no lights at start up, however they came on shortly. Parked it at home. This morning, I took a drive of about 35 miles and the lights were on the whole time. That's when I happened to notice the trip and odometer were not adding miles as I drove. Made a stop, and when I fired it up no lights and odometer and trip working.
So what's wrong?

papaindigo · **Posted:** Sat Oct 25, 2014 11:22 am

Bad wheel speed sensor(s) or on an 05 a broken wire inside, hence invisible, going to and near the rear wheel speed sensor which is apparently on top of the differential. Note if this was an 06 there would be wheel speed sensors at both rear wheels.

woodtick · **Posted:** Sat Oct 25, 2014 12:13 pm

It is an '05. So its the wire or the sensor?

woodtick · **Posted:** Sat Oct 25, 2014 12:17 pm

BTW the speedo works fine.

papaindigo · **Posted:** Sat Oct 25, 2014 12:23 pm

See what others say as I've not personally dealt with this problem. IIRC it can be any one or more of the 3 sensors (2 front and 1 rear on the 05) and a dealer scan tool may be able to tell you which one. If the back sensor shows bad that can be either a bad sensor or the broken wire I mentioned. The wire problem cannot be "seen" because the break is inside the insulation, apparently the wire is rather small and fragile, but I presume a wire break can be checked with a volt/ohm meter at the appropriate wiring end points wherever they are.

flash7210 · **Posted:** Sat Oct 25, 2014 3:09 pm

If your speedo works then I would suspect a front wheel sensor is bad.

It happened to me after I did my front brakes.

woodtick · **Posted:** Sat Oct 25, 2014 3:56 pm

flash7210 wrote:

If your speedo works then I would suspect a front wheel sensor is bad.

It happened to me after I did my front brakes.

The only thing that stop working is the trip and the main odometer.

Are they easy/ cheep to replace? Is there a write up on replacing them?

woodtick · **Posted:** Sat Oct 25, 2014 9:03 pm

DOC4444 · **Posted:** Sat Oct 25, 2014 10:36 pm

Have experience with this. With the symptoms you describe, the single rear speed sensor signal is not being read, either because it has died, or the wiring has. You need to test the wiring to the sensor and find the problem, or if there is nothin wrong, replace the sensor.

DOC

woodtick · **Posted:** Sun Oct 26, 2014 7:47 am

Thanks Doc!

I will need to figure out where/ how to test the wire so in know what to replace.

Jsbarks · **Joined:** Sun Jul 21, 2013 9:42 pm **Posts:** 13

My abs harness was loose, caused a check engine light, abs lights, killed speedo and tach.

gave it a jiggle and no symptoms yet again

geordi · **Posted:** Sun Oct 26, 2014 10:52 pm

rear sensor. The wires break near the plug, you will need the repair kit, I *think* the dealers have that... Its been a looooong time since I fixed mine.

woodtick · **Posted:** Thu Jun 25, 2015 1:39 pm

Well, I replaced the rear sensor and plug end (finally) and no change :furious:

So what else would cause this?

flash7210 · **Posted:** Thu Jun 25, 2015 5:12 pm

Looks like you need to replace one or both of your front wheel sensors.

funnyman06 · **Joined:** Sun Jul 06, 2014 7:46 pm **Posts:** 180

Funny i had this happen to me yesterday except it went back out and has been fine ever since. We both probably need the repair kit geordi was talking about. Its a known issue that when the rear sensor has an issue, both the ABS and brake light turn on and the ODO stops counting, but the speedometer still works. From what I have read only the rear sensor going back will cause these exact symptoms, but I could be wrong.

flash7210 · **Posted:** Thu Jun 25, 2015 6:13 pm

When my front ABS sensor went bad, the ABS and brake lights came on and odometer quit working.
So I guess it doesn't matter which ABS sensor goes out. They all show the same symptoms.

In my case, it was easy to find the culprit. I removed the left front wheel and immediately saw where the wire from the ABS sensor had been rubbing against the wheel.

woodtick · **Posted:** Thu Jun 25, 2015 9:58 pm

Well, I made it worse. I decided to pull the front wheels and inspect the front sensors. Pulled the front left one out of the hub and it appeared fine. Resembled. Then pulled the other side apart and the sensor broke. So now I get to replace the hub assembly too. :roll:

Crap. Well, I have ordered a new hub, as I don't believe I can drill out the balance without the debris getting into the hub and causing a bearing failure in the not so distant future.

bugnout · **Posted:** Fri Jun 26, 2015 9:29 am

I danced this dance before, and in my case the wiring broke within the insulation about an inch up from the connector to the diff speed sensor. Absolutely no external indication that the wire had broken. I cut about a foot of wire out and spliced in a new connector.

I chased this issue for about 2 months and 2 trips to the dealer. I did have them change the brake fluid and purge the ABS unit which was due, but I hate paying for an inspection before they will touch the Jeep.

nicktb · **Joined:** Mon Oct 28, 2013 12:52 pm **Posts:** 65

You can get the remaining ABS Sensor plastic out of the front hub(s). I have done it several times. Spray it down with PB blaster and let it soak. Drill a small hole in the center of the plastic sensor and run a small screw into the hole you drilled. Then gently pull up on the screw to extract the plastic part of the sensor that broke off...

woodtick · **Posted:** Sun Jun 28, 2015 9:29 am

Yes, your right. I did get it out with a small drill, a coarse thread screw, and a small pry bar for.leverage. Unfortunately, I still have the abs and brake lights on. :roll:

So, trace the remaining sensor and hope for the best or pay for the stealership for diagnosis?

ABS and brake lights on dash, and.....

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