ABS Light on

[Yazowski]

Thanks, j cAT.
Had the vehicle into the GMC dealer yesterday and into Monroe a few days earlier. Monroe said "no codes" stored. GMC reported on the codes that WERE stored. GMC says everything is within tollerances but that hub may be bad nonetheless and replacement is $680+ for the one side (left). That one was confirmed replaced by my private mechanic about 15k miles ago in June 2010 (no, I do not drive the truck much). Rust IS the issue here in Central New York, especially, it seems, on the 2003=- model year vehicles - not just Chevy. The amount of rust underneath this '03 suggests to me the "why" GM went bankrupt and Obama's office bailed out them and other manufacturers.
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I hope to take this thread printout and another thread's printout to my other (now) mechanic for telling them: these are the things I want you to try to fix the ABS issue on THIS truck -- I'm paying you to do THIS.

[j cAT]

Originally Posted by Yazowski

Thanks, j cAT.
Had the vehicle into the GMC dealer yesterday and into Monroe a few days earlier. Monroe said "no codes" stored. GMC reported on the codes that WERE stored. GMC says everything is within tollerances but that hub may be bad nonetheless and replacement is $680+ for the one side (left). That one was confirmed replaced by my private mechanic about 15k miles ago in June 2010 (no, I do not drive the truck much). Rust IS the issue here in Central New York, especially, it seems, on the 2003=- model year vehicles - not just Chevy. The amount of rust underneath this '03 suggests to me the "why" GM went bankrupt and Obama's office bailed out them and other manufacturers.
.
I hope to take this thread printout and another thread's printout to my other (now) mechanic for telling them: these are the things I want you to try to fix the ABS issue on THIS truck -- I'm paying you to do THIS.

The rust belt here where we live is quite a PITA.
I just pick up my 2000 SIL 1500 4X4 from the frame repair shop. the rear crossmember was rotted to nothing where the tank passes over it.

GM used that wax coating over the frame / components. as this lifts off the metal it traps the corrosives , my inspection last month I only saw a small 6 inch long crack. when I was done , that wax coating removed the crossmember was 2/3 gone. very lucky for me I found this before the fuel tank fell off.

The frame shop was surprised that the vehicle is in excellant condition except for that metal tube !

I have done these hubs and some testing reveals whats up. the dealer should have found ABS codes. If the light is on you must have a failure. with those codes I can tell you whats wrong.

The hubs come with the sensor. this is because they are matched to provide proper output. the distance from the hub encoder gear to the magnetic speed sensor pick up determines the voltage. now since this is a magnet any rust in the hub/grease will cause the sensor to not produce a voltage.

the timken hubs at auto zone cost about 190.oo . I got some chinese hubs for 70.00 ea and they suddenly failed and I could not stop. the ABS just kept operating killing the brakes. lucky for me I had a 2 yr warr and got my cash back.

now that I have the timkens the vehicle is perfect .

It is quite surprising that these so called mechanic experts just don't understand these electronic systems.

working on transportation vehicles with these controls since the 1970's it is no big deal.

that frame work that was just done cost 400.oo. they did a very good job . excellant welding quality. better than GM !

[Gavin Curtis]

Yakowski,

Check the ground connection of the abs module. It's a heavy wire terminal under a sheet metal screw near the ABS unit on the frame rail. Clean and make sure you have a good electrical connection. If you still have the ABS fault and you are in a rustbelt area, send BOTH the pump and module pack to modulemaster.com

If only orange ABS light, you have a hub/sensor problem. If BOTH ABS and red BRAKE, then module and possible pump are the problem.

Module will be 100% restored. We need to inspect the pump motor internals as corrosion will penetrate it as well. Motor will be sealed to protect it against that crappy salt and mag chloride. It destroys the motor endplate and brush pack.