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 Post subject: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Thu Jan 02, 2014 4:21 pm 
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A week ago I had all these come on at once. The transfer case switch would not function to change from 2WD to 4WD. I took it to my dealer, who diagnosed a broken wheel sensor connector. Now repaired, all warning lights are gone. I did find one interesting phenomenon. Assuming the Liberty was in 2wd, if I set the transfer case switch to 4wd BEFORE starting the engine, the 4WD "engaged" display would show, and 4WD traction would operate. If I shut off the engine and reset the switch to 2WD, then started it again, the 4WD display would extinguish, and 2WD traction would operate. I mention this in case someone else suffers a switch failure-it seems you can still operate the transfer case this way. Who-da-thunk-it? :D


2008 Jeep Liberty North Edition 3.7


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 Post subject: Re: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Fri Jan 03, 2014 9:28 pm 
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Location: Detroit, MI
I had a similar issue caused by a bad wheel speed sensor. $15 and 15min under the back and it hasn't happened again.

What happens is the ABS computer sees the sensor acting up, so it knows it can't trust the readings, so it shuts down, which lights up the ABS, ESP/BAS, and Trac lights. The ABS module is constantly communicating with the Final Drive Control Module (FDCM), so when the ABS module stops talking, the FDCM freaks out too, which sets the Serv 4WD light.

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 Post subject: Re: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Tue Aug 11, 2015 7:39 pm 
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Does anybody have a part number or write up for correcting this issue?

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 Post subject: Re: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Wed Aug 12, 2015 8:48 am 
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Location: Detroit, MI
Front: 68004019AC
Rear: 52125003AB

These are for a 2008. The rears are pretty easy, just disconnect the wiring and unbolt the sensor using a 10mm. Takes all of 5 min and you don't even need to lift it.

The fronts are a bit more involved. You need to remove the front rotor to get access, but from there it's just as easy.

If you can find a code reader that can read abs codes, you'll know which one is bad.

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 Post subject: Re: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Wed Aug 12, 2015 10:13 am 
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ajohns1288 wrote:
Front: 68004019AC
Rear: 52125003AB

These are for a 2008. The rears are pretty easy, just disconnect the wiring and unbolt the sensor using a 10mm. Takes all of 5 min and you don't even need to lift it.

The fronts are a bit more involved. You need to remove the front rotor to get access, but from there it's just as easy.

If you can find a code reader that can read abs codes, you'll know which one is bad.


The code I'm getting from my Hypertexh programmer is C102B, which from everywhere I've read is the right rear ABS sensor. My symptoms are exactly like the OP's. Thanks!

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K&N CAI
Airaid TBS
Dynomax Ultra Flo Catback Exhaust
Hypertech Econ Tuner
245/75r16 Hankook Dyanpro ATMs
16x7 Cragar D Windows
OME HD Front and Rear Springs
Bilstein Shocks and Struts
ATH Front Winch Bumper


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 Post subject: Re: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Wed Aug 12, 2015 12:12 pm 
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Wheel speed sensors, very easy fix and cheap part. Mine did it once too.


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 Post subject: Re: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Fri Aug 14, 2015 12:53 pm 
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Super easy, literally done in 5 minutes. Dealer wanted $160! I don't think so, Tim.

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K&N CAI
Airaid TBS
Dynomax Ultra Flo Catback Exhaust
Hypertech Econ Tuner
245/75r16 Hankook Dyanpro ATMs
16x7 Cragar D Windows
OME HD Front and Rear Springs
Bilstein Shocks and Struts
ATH Front Winch Bumper


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 Post subject: Re: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Sun Nov 29, 2015 2:05 pm 
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Location: Erie, PA
sounds like a fairly common problem. mine is doing the same thing.... what code readers read abs?? My Bully Dog GT did a dignostic read and nothing came up... any place that rents one out that can or is that strictly a dealer thing?

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 Post subject: Re: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Wed Sep 25, 2019 11:27 pm 
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I've had that combination come up. Shutting the engine off and restarting cleared it. Once I had to do that twice. It never happened after that.


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 Post subject: Re: What causes ABS, ESP/BAS and SERV 4WD lights to light
PostPosted: Sat Jan 25, 2020 3:34 pm 
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In my case was s broken connector to the rear right ABS sensor... Mopar sells the part...

Good luck!!!!ImageImage

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