ABS Light on

[Ruger9mm]

I have a 99' silverado and last night the ABS light came on and will not go out. Does anyone have any ideas what I need to look for. Also the emergancy brake is way out of adjustment. I can put the emergancy brake on and it goes to the floor, however it doesn't really hold. I'm really concerned about the ABS light.


it is a 1500 5.3liter


Thanks

Ruger

[Flatrater]

Only way to find out your problem is to hook up a scanner and read the codes! Its a hit or miss with the proper info to fix it!

[Ruger9mm]

Thanks Flatrater, I'm going to have a freind hook it up to a code machine that he has at the shop he works for... Hopefully it will not be to bad.

[Ruger9mm]

Well I had my truck put on a machine and it gave me a code of

U1041 Loss of EBCM Communication

Can anyone tell me what this means and how can I find out if there is a recall for brakes or anything else for a 1999 Silverado

[bowtiebandit]

First make sure all the ABS fuses are good, second check for power and ground at the ABS module just below the drivers door mounted to the frame.
Do you have a strange motor type noise all the time? These modules are know to continue to run and set the light off.

[Ruger9mm]

Well I ended up taking the truck to the shop and it took them 2 days to pin point the problem and they say it is the EBCM (electronic brake control) module went out. They want to charge me $900. Does anyone know where I can get a used one or somewhere else cheaper. It is for a '99 silverado 1500 2 wheel drive


Thanks

[thrilla92]

the reason why this might be happing is because the abs sensor to one of the backing plate on back of brakes is rubbing against your tire or wheel

[Gavin Curtis]

If you had to pull the fuse because of the pump motor running all of the time, you can have it permanently fixed for about $100 instead of buying a new one. The replacement ABS controllers still have the same problem, but the repaired ones have an upgraded part and should not go bad again.

The pump motor control switch (electronic) originally equipped in the ABS module has a 75 amp contact rating and the "contacts" weld together from the pump motor starting current. The new switch that is intalled has a 104 amp "contact" with a 360 amp surge capacity.

They asked not to advertise peoples services here, so email me for more information on who to contact.

This repair can save a person a lot of money.

[Gavin Curtis]

Ruger,

The ABS controller is a full blown computer that communicates to the engine control computer and several others in your truck. They communicate on a two wire serial data system.

Either the communication electrical connections between the engine control computer and ABS controller are bad, the ABS has no power at all or remotely possible the voltage regulator in the abs module has failed (if the ABS fuse is intact and in place and the module is getting power).

Try disconnecting the battery then unplug/plug the communications/logic power connector from the ABS control unit. The communications connector is the larger rectangular plug with many small wires and not the two smaller oval shaped ones with the large wires.

After reseating the communications plug, connect the battery to see if serial communications have been re-established.

Has the ABS fuse pulled because of the constantly running pump motor? If so, the unit can be repaired (no need to replace).

[EdCrabb]

I have a similar problem. I just bought a 1999 Silverado LS 1500 5.3L. The Brake and ABS lite stay on all the time. Checked the fuses, and they were good. Took it to the local Chevy dealer, and asked the Service writer ( a firend of mine) what he thought it was. He replied the ABS pump was shot. I dont have a running pump sound at all.

If I can replace the pump for $100.00 with a rebuilt unit I would love to know where to get it.

Thanks,


Ed Crabb
Molalla Oregon
[email protected]

[Bubba14]

I had a similar problem with my ABS, it is now fixed and working well.
I sent mine to Circuit Solutions. I sent it to them on Tuesday
and recieved it back on Friday. (I used Fed Ex overnite) They saved me a bundle of money and the ABS works fine. I highly recommend them to anyone. Check them out at out www.circuitsolutions.info
Bubba14

Originally Posted by EdCrabb

I have a similar problem. I just bought a 1999 Silverado LS 1500 5.3L. The Brake and ABS lite stay on all the time. Checked the fuses, and they were good. Took it to the local Chevy dealer, and asked the Service writer ( a firend of mine) what he thought it was. He replied the ABS pump was shot. I dont have a running pump sound at all.

If I can replace the pump for $100.00 with a rebuilt unit I would love to know where to get it.

Thanks,


Ed Crabb
Molalla Oregon
[email protected]

[EdCrabb]

Originally Posted by Bubba14

I had a similar problem with my ABS, it is now fixed and working well.
I sent mine to Circuit Solutions. I sent it to them on Tuesday
and recieved it back on Friday. (I used Fed Ex overnite) They saved me a bundle of money and the ABS works fine. I highly recommend them to anyone. Check them out at out www.circuitsolutions.info
Bubba14

I looked up the information and it looks like I can repair the module my self. Its a matter of replacing a not so heavy duty relay/switch in the module with a real heavy duty (higher amperage) unit. Since I am an electronics engineer, I should be able to take care of it,

Thanks Buba!

Ed Crabb
Molalla Oregon
[email protected]

[Gavin Curtis]

EBCM communication failure is most likely due to a bad serial data transceiver IC. The EBCM can be repaired for $100.

[Yazowski]

2003 Silverado 1500 LD 4x4.
Same issues with ABS. On-going for over 2 years.
Some have suggested just pulling the ABS fuse and tollerating the ABS light staying on. May do that out of frustration.
Dealer suggests "possible" fix is replacing the hub assembly. That was done in a prior attempt in 6/2010, "fix" lasted about a month to three months as I recall. Has been a constant issue before that and since that.
I'm interested in the idea of "fixing" the module by changing out the relay to a more stronger rated one.
Where do I: send the module? or buy the stronger relay? or have the fix accomplished (what do I tell my mechanic that I want done (so that I avoid many costly attempts to fix that do not fix)?

[j cAT]

If you live in the rust belt the front hubs are #1 cause of this ABS light being on.

If the output of the front hub sensor is not there ,the ABS lt will stay on.

other things may also cause this to occur so an OEM ABS brake code scanner will get you to the correct solution.

the front hubs need be replaced with timken bearing hubs. If aftermarket chinese hubs were installed it is normal for failure after a few months.
been there done that.

other tests and inspections can reveal the hub condition. rotating the hubs and measuring the output voltage .375 volts AC or more.

removal of the sensor and checking the grease for rust. if the grease is rusted then the grease seals have rusted out causing sensor/hub failure.

since the light is on you need not remove the fuse because you have no ABS. with the sensor output being intermittent then you would need to remove the fuse because of ABS activating causing you to not being able to stop.

could be the relay also inside the abs conrol module.
codes will tell..