ABS and Brake light on. What does it mean?

slick75
0

Asked by slick75 Feb 08, 2010 at 02:26 PM about the 2001 GMC Sierra 1500 SL Standard Cab LB

Question type: Maintenance & Repair

My abs light and my brake light is on, I heard this is a pretty common issue with these trucks. What
are some recommendations on a starting point for troubleshooting.

19 Answers

Matthew Huttema
275

I have the same thing on my truck. what year is yours? i got it checked out at the shop and they said that i would have to replace the abs computor which is about $2500 CDN

26 out of 26 people think this is helpful.
Sam Salameh
100

i had that same problem and all my car need was break fluid .. i guess thats the cars way of telling u you need break fluid !! hope it helps

10 out of 10 people think this is helpful.
97drexelgrad
335

In many cars and trucks, the abs sensor is built into the wheel bearings of each wheel. These thin wires can become corroded and break, especially if you live in the Northern states where road salt is a plenty in the winter. As the previous reply stated- check the fluid first. If all is good, you could contact a GM dealership and have them scan your system with a Tech2 scanner. That would be able to tell you exactly what wheel is causing the trouble and DTC. ( diagnostic trouble code). Or you could pull each wheel, disconnect the bearing harness, hook up a continuity tester to the two leads and spin the bearing. If the meter changes its reading, then that bearing is good. If it stays at 0, then the wire internally is broken, causing an open circuit, therefore causiung the ABS/brake light to illuminate. Good Luck

29 out of 29 people think this is helpful.
Glenn Clingenpeel
960

Mine sometimes comes on when I start the truck, and sometimes when I am moving at constant speeds. Sometimes, it can be a month or more, before seeing the light come on. I have read the wheel sensors may be dirty. How does one clean them? Does the wheel hub, or wheel sensor need to be diassembled, in order to clean it?

96 out of 96 people think this is helpful.
Josepi Locascio
165

what happen to mine was it came on and off and i hooked up the scanner and it said the speed sensor so i changed the wheel bearing and it fixed the problem

10 out of 10 people think this is helpful.
KevDizz
510

Im having a problem on my 2004 sierra where my abs light comes on when i hit bumps in the road. but then it will go away either on its own or when i turn the truck off and back on. this all started happening after i got my tires aligned. ive already replaced the front two wheel bearings this year as well

51 out of 51 people think this is helpful.
Loztcauze
150

KevDizz, that's the same thing that's happening to me except I never had the tires aligned. I replaced the sensor that the code came up for and still comes on and goes off when it wants to.

14 out of 14 people think this is helpful.
Jeremy Lancaster
30

Or could mean u need to change your brakes

3 out of 3 people think this is helpful.
Obey Cool
270

I have a question abs because it pop up my dashboard and I am driving a GMC ENVOY THE ON MY TRUCK IS A 2000 WHAT SHOULD I DO

27 out of 27 people think this is helpful.
You think this is helpful.
2004Sierra
70

I have a 2004 GMC Sierra Truck. The transfer case will not engage into four wheel drive. I took it to a GMC dealer and they are saying that is internal, but can not diagnois it until it is taken apart. Anyone have any suggestions?

7 out of 7 people think this is helpful.
Barbara Turner
80

I have a 98 Blazer. My husband just had the clock spring, both airbag sensors front driver and passenger replaced, vacuum hose, front sway bar, all front brakes - rotors, hub assemblies, calipers and that was just to get it inspected! Since I got it back however the abs light was coming on and off and the left front brakes would bddddtttt grab and make an awful ffflllllpppp sound and scare me to death. Took it to Auto Zone and the girl put the code diagnostic on it and showed me it was the left front brake with a code of 225 and 227, the speed sensor. Took it and got that fixed this morning and that fixed the braking problem but now the ABS light is on and won't go off at all. They told me that I needed to have the complete system diagnosed for all codes and wires, etc. could be bad or something wrong. HELP! Does anybody have any other cheaper ideas! I'm on full disability, my husband just laid out $1,500 to get all I talked about above fixed, I laid out $184.00 for the speed sensor. I'm being drained fast! WHAT could it be?! Thanks!

5 out of 5 people think this is helpful.
Loztcauze
150

I replaced the speed sensor and it still came on so then I ordered a new hub assembly which came with a speed sensor(didn't know that) so I put that on and haven't had a problem since, been about ten months now. Now I have an extra sensor. Wish I could help more, was yours a repairable or in a flood or something.

1 out of 1 people think this is helpful.
Barbara Turner
80

Loztcauze: My husband as I said in my post had all rotors, hub assys, calipers, ALL of it replaced brand new. No it was garage kept for the entire life of the vehicle prior to my purchase. It's in basically mint condition. Thanks anyway!

2 out of 2 people think this is helpful.
jessegm1991
10

the cause for the abs light and brake light to come on is because of your master cylinder is on its way out i had it happen on my truck replaced the master cylinder and the lights have not come back on it common for this to happen if had to replace it in a couple of vehicles of mine the are gm modeled vehicles

1 out of 1 people think this is helpful.
Barbara Turner
80

@ jessegm1991 - Actually, my husband who used to build cars and was 1 year away from rookie NASCAR status when we married checked all around my Blazer and the MC was and is fine! What it turns out to be is simply an open circuit when I had the codes checked. So thanks for your expertise.

1 out of 1 people think this is helpful.
jessegm1991
10

ok that something i looked into before i replaced it there wasnt open circuit it was bad but i also found out that my hub is bad everything in it it hasnt been replaced im doing that today

Barbara Turner
80

Are you talking about the ABS computer unit, those run about $300.00 where I live. Everything works fine but just the abs light on. It passed inspection and they told me not to worry about it. The ABS brake sys works fine, stops on a dime.

temple62
0

There is nothing mechanically wrong with your GMC truck. This is a GM engineered ploy to get you to take your vehicle to the dealer for a remedy. I did and it cost $45 and a tolerance of morons at the dealer telling me there was "water" in the fuse box? I paid the bill, started the truck and the ABS light and ding dong came on as it had before. 2 years later it is still coming on about every other time I start the truck! With 33,000 city miles on it, the ABS has never been used since I do not drive on the interstate for longer than 10 miles. Gotta love GM, they'll try anything to scare the customer into giving them more business!

Seth Hartman
0

could a wheel speed sensor being disconnected during an alignment cause it to pull to one side? 97 GMC Yukon

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