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ABS light cannot go over 50

Tiny
TJ NAYLOR
  • MEMBER
  • 1998 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000,000 MILES
Check out wheel speed sensor one was torn in half all the others were fine. Also checked sensor rings, they were clean. But still the light is on and can't push it over 50 abs 0 to 50 in 3 days and fuses were fine.
Monday, September 9th, 2019 AT 7:44 PM

15 Replies

Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
Hi and welcome back to 2CarPros. Lets see if we can help here.

First, your post is kind of written in short hand. Could you give me a detailed description of your problem because I am not sure what 1/2 of your post is saying.

Thank you, Rich.
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Tuesday, September 10th, 2019 AT 2:13 PM
Tiny
TJ NAYLOR
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  • 14 POSTS
So I have a 1998 Jeep Grand Cherokee that has a ABS light on and it won't go over 50mph no matter how hard I pushed it. So I checked the front wheel speed sensors and the passenger side was torn in half and the ends were touching so I replaced it and tested it with a voltage meter and it aced it so I thought for sure that would fix all my problems, I thought wrong light is still on and can't go over 50mph no improvement what so ever. I also here some rotor rubbing from the rear, so I think I tested the back sensors with a voltage meter I saw on machinic collage aka YouTube it told me to lift up the back seats and there is a ABS thing underneath the carpet in the middle so I disconnected the wire and tested that out and it passed but it makes no sense there is one wire and two sensors. So not sure if that was the correct wiring because there are two separate wires coming up from right underneath it that looks like the wires I'm looking for but not for sure. And if I test the right thing then I don't no were to go from there.
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Tuesday, September 10th, 2019 AT 7:20 PM
Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
Thank you for being more clear. I have two more questions for you if you don't mind.

1: The ABS light is on, what codes have you pulled from it? This link will give you instructions on how to retrieve the codes if you don't know how.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

2: When you are doing 50 mph how many RPM's is your tachometer reading?

Rich.
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Tuesday, September 10th, 2019 AT 8:44 PM
Tiny
TJ NAYLOR
  • MEMBER
  • 14 POSTS
I been having a hard time finding someone that can pull the codes for me so I haven't read the codes yet. The tachometer reads 2,000 to 2,500 rpm's when going a steady 50 mph.
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Wednesday, September 11th, 2019 AT 1:08 PM
Tiny
TJ NAYLOR
  • MEMBER
  • 14 POSTS
So I had it ran for codes and it did not look good. Three wheel speed sensors are out. That would explain the lack of speed.
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Wednesday, September 11th, 2019 AT 2:14 PM
Tiny
TJ NAYLOR
  • MEMBER
  • 14 POSTS
So I had it ran for codes and it did not look good 3 wheel speed sensors are out that would explain the lack of speed. But I just changed the front passenger side.
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Wednesday, September 11th, 2019 AT 2:16 PM
Tiny
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  • MECHANIC
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Okay, get those taken care of and we'll see where yer at.

Also 2500 RPM at 50 is a bit high. You may have a high gear transmission issue or maybe the converter isn't locking up.

Rich
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Wednesday, September 11th, 2019 AT 7:30 PM
Tiny
TJ NAYLOR
  • MEMBER
  • 14 POSTS
Can you help me figure out what the codes mean? Except the wheel speed sensors. There is a couple of codes I'm not familiar with.
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Wednesday, September 11th, 2019 AT 7:45 PM
Tiny
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  • MECHANIC
  • 680 POSTS
Absolutely, Give me all the codes and I will look them all up.

Rich
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Wednesday, September 11th, 2019 AT 8:55 PM
Tiny
TJ NAYLOR
  • MEMBER
  • 14 POSTS
G switch not prossiable. Cab power feed circuit. Right front speed circuit failure. The rest are speed sensors I'm not sure if bad speed sensors can trigger all if that.
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Thursday, September 12th, 2019 AT 2:14 AM
Tiny
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  • MECHANIC
  • 680 POSTS
Do you have the P, C or U code numbers?

Rich
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Thursday, September 12th, 2019 AT 7:26 PM
Tiny
TJ NAYLOR
  • MEMBER
  • 14 POSTS
No, I don't but I do have a update it did not have anything to do with ABS it turned out that I had a plugged catalytic converter I couldn't get out my upstream sensor. So I took a shot in the dark and drilled two holes through the catalytic converter and bam problem gone. Now it's loud as heck so it's time for a new catalytic converter.
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Friday, September 13th, 2019 AT 8:28 PM
Tiny
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  • MECHANIC
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I am glad you figured it out. Make sure you replace or punch that catalytic converter. A plugged catalytic converter will get your exhaust manifold glowing red and may not only cause engine damage but will start a good fire eventually.

Rich
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Friday, September 13th, 2019 AT 8:36 PM
Tiny
TJ NAYLOR
  • MEMBER
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Good to know. Yeah I punched, but going to get it replaced as soon as I get a free check. Thanks for your help buddy.
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Friday, September 13th, 2019 AT 9:15 PM
Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
Any time, that's why we are here. Have a great day.

Rich
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Friday, September 13th, 2019 AT 10:15 PM

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