ABS Hydraulic Unit runs continuously

mack1001 · 09-09-2009, 04:49 PM

2003 4WD Sierra -- the hydraulic unit on my ABS system runs continuously, even with the ignition off & key removed. Started after running through some wet mud. No visible damage to speed sensor wires. Any ideas???

Crmzendrgone · 09-09-2009, 06:19 PM

You have got something wet that shouldn't of got wet is my guess. Connectors, inside the connectors. Maybe disconnect the battery see if that will reset the system.

mack1001 · 09-09-2009, 07:16 PM

That doesn't work. It's my son's truck -- he's been disconnecting the battery every time he stops since the weekend -- no change. Today I unplugged the Hyd. Unit so he doesn't have to do that. Now he's driving with his ABS light glaring and obviously without ABS capability. Found some more info that says it's probably the circuitry in the Hydraulic unit. Costs in the $1000 range from a dealer. Gonna check into options...

leolkfrm · 09-09-2009, 08:04 PM

Make sure he understands the way to brake without the abs(the old way)

Crmzendrgone · 09-09-2009, 08:10 PM

Quote:

Originally Posted by leolkfrm

Make sure he understands the way to brake without the abs(the old way)

Good point. I am glad I grew up without ABS. Hit the brakes and hope you don't hit it.

scavanger · 09-09-2009, 08:14 PM

If you can open it up try drying it out. might just be an internal connection still wet.

Scav.

Wyley87 · 09-09-2009, 08:41 PM

well i've been doing some research on the net about the abs on my truck. i ran across these guys but they could not help me cuz i got a 96 but maybe you can get somthing out of it. The abs pump running continuously is vary common, they claim they can fix them.

ABSFIXER.COM / ABS EBCM Repair

crabtruck · 09-09-2009, 09:49 PM

mack1001 you should just pull the ABS fuse - that's seperate for motor and doesn't totally kill system.
Tranny and ECM are tied in so better disconnecting as little as possible.
Also with that fuse out you may still be able to get a helpful code read.
Disconnecting battery will wipe out some but probably you can get good info
with ABS (EBCM) plugged in and ABS fuse out (60A on underhood block)

Crmzendrgone · 09-10-2009, 01:13 AM

Quote:

Originally Posted by crabtruck

mack1001 you should just pull the ABS fuse - that's seperate for motor and doesn't totally kill system.
Tranny and ECM are tied in so better disconnecting as little as possible.
Also with that fuse out you may still be able to get a helpful code read.
Disconnecting battery will wipe out some but probably you can get good info
with ABS (EBCM) plugged in and ABS fuse out (60A on underhood block)

Man either you know your stuff or Shhh you are a jedi master.

crabtruck · 09-10-2009, 02:55 AM

Quote:

Originally Posted by Crmzendrgone

Man either you know your stuff or Shhh you are a jedi master.

Definately know my stuff, if "stuff" is a euphemism,
but other than that, you meant it literally.

So,THERE to those who say I don't know stuff !

09-09-2009, 04:49 PM	#1
mack1001 Junior Member Join Date: Sep 2009 Posts: 2	ABS Hydraulic Unit runs continuously 2003 4WD Sierra -- the hydraulic unit on my ABS system runs continuously, even with the ignition off & key removed. Started after running through some wet mud. No visible damage to speed sensor wires. Any ideas???

09-09-2009, 06:19 PM	#2
Crmzendrgone Senior Member Join Date: Apr 2009 Location: Arizona Posts: 1,420	You have got something wet that shouldn't of got wet is my guess. Connectors, inside the connectors. Maybe disconnect the battery see if that will reset the system. __________________ ENGINES PRODUCE POWER. MOTORS RECEIVE POWER. https://lastroundbestround.com/Home_Page.html

09-09-2009, 07:16 PM	#3
mack1001 Junior Member Join Date: Sep 2009 Posts: 2	Won't reset That doesn't work. It's my son's truck -- he's been disconnecting the battery every time he stops since the weekend -- no change. Today I unplugged the Hyd. Unit so he doesn't have to do that. Now he's driving with his ABS light glaring and obviously without ABS capability. Found some more info that says it's probably the circuitry in the Hydraulic unit. Costs in the $1000 range from a dealer. Gonna check into options...

09-09-2009, 08:04 PM	#4
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	Make sure he understands the way to brake without the abs(the old way) __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

09-09-2009, 08:41 PM	#7
Wyley87 Senior Member Join Date: Jul 2009 Location: Arlington, Tx Posts: 519	well i've been doing some research on the net about the abs on my truck. i ran across these guys but they could not help me cuz i got a 96 but maybe you can get somthing out of it. The abs pump running continuously is vary common, they claim they can fix them. ABSFIXER.COM / ABS EBCM Repair __________________ 96-GMC C1500 305ci 2WD K&N FIPK Cold Air Intake Rebuilt Motor (should have gone 350) and Trans 05 Nissan Xterra 4.0 V6 No mods so far Cost money to go fast...How fast do you wanna go?

09-09-2009, 08:14 PM	#6
scavanger Senior Member Join Date: May 2007 Posts: 262	If you can open it up try drying it out. might just be an internal connection still wet. Scav.

09-09-2009, 09:49 PM	#8
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,366	mack1001 you should just pull the ABS fuse - that's seperate for motor and doesn't totally kill system. Tranny and ECM are tied in so better disconnecting as little as possible. Also with that fuse out you may still be able to get a helpful code read. Disconnecting battery will wipe out some but probably you can get good info with ABS (EBCM) plugged in and ABS fuse out (60A on underhood block)

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