ABS Light / Speedo problem
Thread Starter
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Junior User
Joined: Oct 2003
Posts: 50
Likes: 2
From: Columbus, OH
ABS Light / Speedo problem
I've got a 2000 3.0L 4x4 5-speed ext. cab (just turned 60k) and I'm having my first real problem with it. I put on 31" Michelin's after the Firestone recall so my speedometer hasn't been accurate for 2 years ... not a problem, my mental speedo has been doing just fine 
However, this past week, after about 15-20 mins of driving, the needle will jump (coinicidentally) to my actual speed ... from 65 to 70 without actually speeding up my truck. The tac. isn't affected. The ABS light also kicks on immediately after this happens. And in just the past couple of days, the ABS light will sometimes come on right at startup. I know the speedo is run via the ABS system but I have no idea where to start looking for the problem. I've talked to Autozone who will pulll check engine light codes but they can't do ABS light codes. Is there any way to pull ABS codes without an OBDII meter which I don't have access to and am not planning on buying?? I've been reading this forum since my problem started a week ago and it looks like you guys may be the only resource around competent enough to give me a definite answer.
I'd greatly appreciate any help you can provide on this as I'm supposed to drive to Charlotte next Fri. night for the NASCAR race ... would hate to have that annoying orange glow on my cluster for 8 hours. Thanks!!
However, this past week, after about 15-20 mins of driving, the needle will jump (coinicidentally) to my actual speed ... from 65 to 70 without actually speeding up my truck. The tac. isn't affected. The ABS light also kicks on immediately after this happens. And in just the past couple of days, the ABS light will sometimes come on right at startup. I know the speedo is run via the ABS system but I have no idea where to start looking for the problem. I've talked to Autozone who will pulll check engine light codes but they can't do ABS light codes. Is there any way to pull ABS codes without an OBDII meter which I don't have access to and am not planning on buying?? I've been reading this forum since my problem started a week ago and it looks like you guys may be the only resource around competent enough to give me a definite answer. I'd greatly appreciate any help you can provide on this as I'm supposed to drive to Charlotte next Fri. night for the NASCAR race ... would hate to have that annoying orange glow on my cluster for 8 hours. Thanks!!
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Hello, welcome to Ford Truck Enthusiasts!
Based on the symptons you describe, the first thing that comes to my mind as a possible cause is the rear anti-lock brake sensor which is mounted on the top of the rear differential case on your truck. That is the sensor that controls your ABS system and also provides vehicle speed data to the PCM (and hence controls the speedo).
If you do a search in this forum you will find some previous threads on the subject. Replacing the sensor is something that can easily be done yourself, if necessary.
Hope this helps...good luck.
Based on the symptons you describe, the first thing that comes to my mind as a possible cause is the rear anti-lock brake sensor which is mounted on the top of the rear differential case on your truck. That is the sensor that controls your ABS system and also provides vehicle speed data to the PCM (and hence controls the speedo).
If you do a search in this forum you will find some previous threads on the subject. Replacing the sensor is something that can easily be done yourself, if necessary.
Hope this helps...good luck.
Freshman User
Joined: Jun 2003
Posts: 44
Likes: 0
From: DESTIN FL
I had same problem speed sensor is in the top of diff, all you need is a 10mm wrench and $20 to fix the problem. I also went a extra step and change my diff fluid ,it was low when I changed the sensor.
Thread Starter
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Junior User
Joined: Oct 2003
Posts: 50
Likes: 2
From: Columbus, OH
Thanks guys! That did the trick. All around an easy job ... 20 mins. Would have been 15 but it was actually a 3/8 bolt (but who's counting). I even got charged less than retail for the sensor. Thanks again for all the help!
