GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 LastLast
Results 1 to 10 of 17
  1. #1

    Default 2000 Sonoma ABS lights

    The ABS and Brake warning lights come on at times.

    When starting the truck in the morning the warning lights on the dash behave as you would expect, light momentarily then go off.
    After reaching normal operating temperature, turn off engine then restart, the warning lights come on and stay on. (like a trip to the store for example).
    Of course this doesn't happen all the time, some days the warning lights don't stay on.
    The 4 wheel disc pads have been replaced, they were worn but still had life left. The emergency brake was adjusted but the pads were not replaced. The ABS system seems to operate correctly in that I can feel the pulsing when they activate on a slippery surface. (regardless of whether the warning lights are on or off)
    This problem was occuring before brake pad replacement.
    What tests can I perform to isolate the cause prior to a visit to the repair shop?

    Bill

  2. #2

    Default

    You can borrow an OBII reader at most parts stores and see if it’s throwing any codes.

    It could just be that it needs brake pads.

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesn’t.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
    86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
    See a Pattern yet?

    15 year GM assembly line worker.

  3. #3

    Default

    You could disconnect battery see if that clears any silliness the computer is getting up too.

    or put tape over lights and adjust radio volume accordingly



    Sorry I'll stop...



    Jamie

    2007 Ford E250(Work van) (Ya, Ya, shut up!)
    1996 GMC Sierra SLE 1500 5.7L/4L60E

  4. #4
    Legend
    TrailLeadr's Avatar
    Join Date
    Jun 2005
    Location
    Coventry, Rhode Island
    Posts
    3,103

    Default

    Quote Originally Posted by Cableguy View Post
    You could disconnect battery see if that clears any silliness the computer is getting up too.

    or put tape over lights and adjust radio volume accordingly



    Sorry I'll stop...
    Jamie, I can't believe you're making me say this...

    I know the dealers charge a lot, but it's not worth it to ignore the light.
    Either have the codes pulled, or take it in for service. It's not safe for your vehicle to be on the road while that light is on.
    It doesn't matter if it works properly as far as you can tell. Something is amiss, and it should be taken care of ASAP.

    I feel as though I say this too often, but ABS light doesn't mean it won't work when needed, it also means it could activate when not needed leaving you with nearly no braking power.
    Patrick
    Rhode Island


  5. #5

    Default

    I'm sorry you know you really are right here. If codes are coming up from time to time only, does the computer store that to be read later by the reader. I've always wondered that? Even if light is out when being read?



    Jamie

    2007 Ford E250(Work van) (Ya, Ya, shut up!)
    1996 GMC Sierra SLE 1500 5.7L/4L60E

  6. #6

    Default

    Quote Originally Posted by TrailLeadr View Post
    Jamie, I can't believe you're making me say this...

    I know the dealers charge a lot, but it's not worth it to ignore the light.
    Either have the codes pulled, or take it in for service. It's not safe for your vehicle to be on the road while that light is on.
    It doesn't matter if it works properly as far as you can tell. Something is amiss, and it should be taken care of ASAP.

    I feel as though I say this too often, but ABS light doesn't mean it won't work when needed, it also means it could activate when not needed leaving you with nearly no braking power.
    Thank you all for your responses, I fully intend to take the truck in for service, but was thinking there must be routine checks that I could make to eliminate the "oh it was just a loose connection" kind of repair. The dealer's labor costs may be slightly higher than an independant shop but I think the dealer technicians have a higher experience level for a specific vehicle which could result in a lower labor cost overall.

    Thanks again,
    Bill

  7. #7

    Default

    Quote Originally Posted by Cableguy View Post
    You could disconnect battery see if that clears any silliness the computer is getting up too.

    or put tape over lights and adjust radio volume accordingly



    Sorry I'll stop...
    I tried the tape route but the light is so bright I had to cover the whole instrument panel to prevent it from being a distaction. Now I don't see the lights but I keep getting speeding tickets cause I can't see the speedo......

  8. #8
    Legend
    TrailLeadr's Avatar
    Join Date
    Jun 2005
    Location
    Coventry, Rhode Island
    Posts
    3,103

    Default

    Quote Originally Posted by Bill B View Post
    I tried the tape route but the light is so bright I had to cover the whole instrument panel to prevent it from being a distaction. Now I don't see the lights but I keep getting speeding tickets cause I can't see the speedo......
    LOL...not a good situation.

    I know that on some of the vehicles with ABS, magnetic particles will gather around the end of the sensor. Your issue sounds like it has more to do with heat than anything else.

    To help narrow it down, have you ever started the vehicle, and let it idle for a while so the engine compartment gets nice and warm, and then shut it off and see if it happens without the vehicle being moved.
    This way you can see if the problem is at the control module, or if it's at the wheels, or a short in the line.

    If it happens without the vehicle moving then it's something in the module, more than likely heat related.

    If not, then it's probably either a short in the line, or heat at the wheels from the brakes affecting a bad sensor, or a sensor that's on it's way out.
    Patrick
    Rhode Island


  9. #9

    Default

    Quote Originally Posted by TrailLeadr View Post
    LOL...not a good situation.

    I know that on some of the vehicles with ABS, magnetic particles will gather around the end of the sensor. Your issue sounds like it has more to do with heat than anything else.

    To help narrow it down, have you ever started the vehicle, and let it idle for a while so the engine compartment gets nice and warm, and then shut it off and see if it happens without the vehicle being moved.
    This way you can see if the problem is at the control module, or if it's at the wheels, or a short in the line.

    If it happens without the vehicle moving then it's something in the module, more than likely heat related.

    If not, then it's probably either a short in the line, or heat at the wheels from the brakes affecting a bad sensor, or a sensor that's on it's way out.
    Good advice! My question up top kinda got missed. Does the fault code get stored in ECM memory even if light is out on dash? At time you put reader on?
    I guess that goes for my work van too Patrick?



    Jamie

    2007 Ford E250(Work van) (Ya, Ya, shut up!)
    1996 GMC Sierra SLE 1500 5.7L/4L60E

  10. #10
    Legend
    TrailLeadr's Avatar
    Join Date
    Jun 2005
    Location
    Coventry, Rhode Island
    Posts
    3,103

    Default

    Quote Originally Posted by Cableguy View Post
    Good advice! My question up top kinda got missed. Does the fault code get stored in ECM memory even if light is out on dash? At time you put reader on?
    I guess that goes for my work van too Patrick?
    Sorry, I thought you were thinking out loud.
    I'm pretty sure they were not retained if the light went back out in OBDI. I'm guessing that was changed with OBDII, but I can't say for sure.
    Sorry.
    Patrick
    Rhode Island


Page 1 of 2 12 LastLast

Similar Threads

  1. Sonoma Chevrolet Review - Sonoma, CA
    By Chevy Dealer Reviews in forum Car Dealer Reviews
    Replies: 0
    Last Post: 01-08-2011, 08:08 PM
  2. 2003 GMC Sonoma fog lights
    By 61hawk in forum Chevy Truck Tech Forum
    Replies: 2
    Last Post: 10-31-2010, 12:18 PM
  3. Replies: 0
    Last Post: 01-10-2010, 10:20 AM
  4. 2000 Silverado Fog Lights Out?
    By Velocity1 in forum Audio, Video & Gadget Tech
    Replies: 2
    Last Post: 11-11-2009, 06:50 PM
  5. Changing the driveshaft on a 2000 Sonoma
    By jgooder in forum General Chevy & GM Tech Questions
    Replies: 3
    Last Post: 11-17-2008, 05:09 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •