Jump to content

ABS/Brake light Service Brake system Error Message

LouieC

By LouieC
in Ask A GM Technician

Recommended Posts

LouieC Enthusiast

LouieC

Posted
Posted

:chevrolet: Ok I could really use some help with this one ....I am getting the error message brake system needs service I hooked up my Tech 2 and got the code for a mismatched wheel speed checked the "speed vs. Spedo and I start out at 3 mph not moving at low speed the abs sensors and spedo are within 1-2 mph the front to rear is also within 1-3 mph at a little higher speed I am almost a full 10 mph difference front to rear but the rear is dead on with the spedo I have the same size tires on the front and rear 275-65-20s I am just having a problem thinking that BOTH front speed sensors have gone bad at the same exact time.... Cant figure what I am missing

 

2004 Silverado LT 5.3 "T" 2wd

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

You have to follow the code and not assume anything is "bad" I use "failed" but whatever floats your boat

 

No guessing is my point ,

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Have you verified air pressures in all 4 tires with the same gauge? Keep in mind that the speed difference is actually in a percentage. 3mph out at 30mph is the same as 6mph at 60mph. If it is showing any speed when not moving, that should be pointing you at the issue.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,962
    Total Members
    8,960
    Most Online
    contrabombarde
    Newest Member
    contrabombarde
    Joined

  • Who's Online   1 Member, 0 Anonymous, 897 Guests (See full list)

  • Latest Articles

  • Posts

    • jgaudet99
      Tire psi

      By jgaudet99 · Posted

      Thanks for all the help so far!   I did try right from 2026 right down to 2021, and only from 2023 down lets me select the option for tire psi change, but I get the vehicle not supported error!   I'll definitely try it under Chevrolet after work today, and I'll get the sensor number from gm for my truck tire sensors. And I'll let you know if it works for me under Chevrolet!   And if that doesn't work, I'm going to guess that what @Atlas said about maybe I have a different body control module could be true!  
    • Jsdirt
      2010 Avalanche 5.3 not running correctly after engine swap.

      By Jsdirt · Posted

      From where I'm sitting this sounds like a compatibility problem. I'm assuming the 2007 was a 900-series truck, and not an 800-series (they were sold side-by-side in dealerships that model year), since it starts and runs.   This is why I HATE post-2006 vehicles. Everything becomes a huge problem when you try to keep the thing running for longer than the manufacturer has designed it to.    I can't remember when Global-A architecture started - either '10 or '11. For your sake, you had better hope it's '11, or you're going to be spending some BIG money to correct this cluster-eff. That's something you need to find out before doing anything else. You may have several computers bricked ... but the fact that it runs tells me you MIGHT be ok here.     EDIT: Just did a quick refresher. You're screwed. This is Global-A. The 2 systems are NOT compatible in the slightest. Once you get the correct engine in there that IS compatible, you're going to need to see how many computers are locked. Absolute NIGHTMARE to straighten out, too. Your buddy might be better off cutting his losses and finding something else.   Welcome to post-2006 vehicle electronics. This is why I quit the industry, and drive nothing built after 1994. This stuff takes all the fun out of wrenching!  
    • bwiese
      Show Us Your 2019 & Up T1 Pictures !

      By bwiese · Posted

      Recently acquired new 2026 Silv. 1500 WT  - L3B + 4WD,  std cab + std bed, in (duh!) Sierra White. Upgrades: replaced 'steelies' w/  Vision "Flow" black alloys,  17x8.5"; HDX nerf bar w/steps (black powdercoat); Weatherguard large/deep alloy saddle toolbox; Michelin fitted bedmat (sale, perfect fit) Weathertech door sill guards TBD: rear wheebox liners 4x black fender arch trim - searching for best  (Putco: chrome only; not looking for flares either!) -Bill    
    • Chuck FB
      Tire psi

      By Chuck FB · Posted

      True, hard to say what differences there may or may not be between Chev and GM as well as a production year or mid year part change either.    I just found it odd that under the Sierra choice on the Autel that many of the last few years of production year did not include the choice of changing the tire pressure but if that is an Autel thing or a GM thing as to why the choices were not there. Knowing what tpms sensors are on the truck should give some guidance into which choices on the tool even make sense to try as I wouldn't give up just yet with the tool but I guess he will see what if anything he comes up with if he finds out a bit more info and tries a few more things on the Autel. 
    • davester
      Needing this part.

      By davester · Posted

      I'm sure if you went to a junkyard where you go in and pull the part off the truck yourself, not a used part place where they do it for you, you can get that part on it's own.  Depending on if and what else you would be buying, and time of day, they might even just skip over adding it as a item to the bill.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...