Chevy - ABS Brake light comes on intermittently

I know there are some whiz Chevy guys on this board. My 2000 Silverado Z71 ABS and Brake lights are coming on from time to time. Looking for a little advice before I start buying and swapping parts.

Thanks,
Mike

had a lot of problems with water internaly getting into the ebcm. brake module along the left frame rail.

Document ID# 1587153
2000 Chevrolet Chevy K Pickup - 4WD


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Subject: Product Safety - Front Wheel Speed Sensor Corrosion #04094 - (01/25/2005)



Models: 1999-2002 Chevrolet Silverado

2000-2002 Chevrolet Tahoe, Suburban

2002 Chevrolet Avalanche

1999-2002 GMC Sierra

2000-2002 GMC Yukon, Yukon XL

Located in Ontario, Quebec, Newfoundland, New Brunswick, Nova Scotia, Prince Edward Island




--------------------------------------------------------------------------------

Condition
General Motors has decided that a defect which relates to motor vehicle safety exists in certain 1999-2002 Chevrolet Silverado, 2000-2002 Chevrolet Tahoe, Suburban, 2002 Chevrolet Avalanche, 1999-2002 GMC Sierra, 2000-2002 GMC Yukon, Yukon XL vehicles located in Ontario, Quebec, Newfoundland, New Brunswick, Nova Scotia, and Prince Edward Island. These vehicles may have a condition permitting corrosion to occur between the front hub/bearing assembly and the wheel speed sensor. If the brakes are applied while the vehicle is travelling at a speed of greater than 6 km/h (3.7 mph) but less than 16 km/h (10 mph), the corrosion may cause an unwanted anti-lock brake system (ABS) activation. If this condition occurred where stopping distance is limited, a crash could occur.

Correction
Dealers are to clean and treat the affected area, and in some cases, replace the front wheel speed sensor.

Vehicles Involved
Involved are certain 1999-2002 Chevrolet Silverado, 2000-2002 Chevrolet Tahoe, Suburban, 2002 Chevrolet Avalanche, 1999-2002 GMC Sierra, 2000-2002 GMC Yukon, Yukon XL vehicles located in Ontario, Quebec, Newfoundland, New Brunswick, Nova Scotia, and Prince Edward Island and built within these VIN breakpoints:

Year
Division
Model
From
Through

2002
Chevrolet
Avalanche
2G100036
2G363592

1999
Chevrolet
Silverado
X1100020
X1299247

XE100004
XE256732

XZ100011
XZ214525

2000
Chevrolet
Silverado
Y1100133
Y1405970

YE100163
YE433798

YZ100149
YZ371921

2001
Chevrolet
Silverado
11100142
11407113

1E100192
1E336884

1F106141
1F211164

1Z100191
1Z334358

2002
Chevrolet
Silverado
21100156
21419297

2E100444
2E305421

2F100374
2F240815

2Z100416
2Z348298

1999
GMC
Sierra
X1500012
X1571383

XE500003
XE555865

XZ500005
XZ540992

2000
GMC
Sierra
Y1100181
Y1403129

YE100251
YE433795

YZ100185
YZ371911

2001
GMC
Sierra
11100139
11407805

1E100214
1E336874

1F106143
1F211229

1Z100174
1Z335044

2002
GMC
Sierra
21100194
21419089

2E100809
2E305888

2F100538
2F241040

2Z101557
2Z348466

2000
Chevrolet
Suburban
YG100061
YG229022

YJ100468
YJ211389

2001
Chevrolet
Suburban
1G104020
1G280557

1J100301
1J292755

2002
Chevrolet
Suburban
2G126599
2G317898

2J101267
2J318178

2R232620
2R300009

2000
Chevrolet
Tahoe
YJ100026
YJ211859

2001
Chevrolet
Tahoe
1J100026
1J309634

1R100402
1R218091

2002
Chevrolet
Tahoe
2J100983
2J325817

2R116414
2R313418

2000
GMC
Yukon
YJ100166
YJ211823

2001
GMC
Yukon
1J103611
1J292565

1R100509
1R203664

2002
GMC
Yukon
2J184383
2J309025

2R116570
2R302224

2000
GMC
Yukon XL
YG100003
YG210566

YJ100393
YJ210566

2001
GMC
Yukon XL
1G101568
1G279527

1J101870
1J292644

2002
GMC
Yukon XL
2G127091
2G326479

2J100796
2J337991

2R232816
2R300196


Important: Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) before beginning recall repairs. [Not all vehicles within the above breakpoints may be involved.]

For dealers with involved vehicles, a Campaign Initiation Detail Report containing the complete Vehicle Identification Number, customer name and address data has been prepared and is being furnished to involved dealers. Dealers that have no involved vehicles currently assigned will not receive a report with the recall bulletin.

The Campaign Initiation Detail Report may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose other than follow-up necessary to complete this recall is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this program.

Parts Information
Parts required to complete this recall are to be obtained from General Motors Service Parts Operations (GMSPO). Please refer to your "involved vehicles listing" before ordering parts. Normal orders should be placed on a DRO=Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO=Customer Special Order.

Note: Very few vehicles will require front wheel speed sensor replacement; if required, order appropriate part from GMSPO.

Part Number
Description
Qty

89022218
Lubricant, Rust Penetrating (will service 50+ vehicles)
1

00993037
Lubricant, Wheel Bearing (will service 25+ vehicles)
1


Service Procedure
The following procedure provides instructions for repairing a corrosion condition where the front wheel speed sensor mounts on the front wheel bearing assembly.

Raise the vehicle on a suitable hoist and support as necessary.
Remove both front tires and wheels.



Compress the front brake caliper pistons.
3.1. Install a large C-clamp over the top of the caliper housing and against the back of the outboard pad.

3.2. Slowly tighten the C-clamp until the pistons are pushed completely into the caliper bores.

3.3. Remove the C-clamp from the caliper.





Important: It is not necessary to remove the front brake caliper from the bracket when removing the bracket in the next step.

Remove the two bolts that attach the front brake caliper mounting brackets to the knuckle.
Notice: Support the brake caliper with heavy mechanic's wire, or equivalent, whenever it is separated from its mount and the hydraulic flexible brake hose is still connected. Failure to support the caliper in this manner will cause the flexible brake hose to bear the weight of the caliper, which may cause damage to the brake hose and in turn may cause a brake fluid leak.

Remove the brake caliper and bracket as an assembly and support it with heavy mechanic's wire or equivalent. DO NOT disconnect the hydraulic brake flexible hose from the caliper.
Mark the relationship of the rotor to the bearing hub.
If equipped, remove the rotor retaining push nuts from the wheel studs.



Remove the rotor.



Remove the bolt (1) that attaches the wheel speed sensor to the bearing hub.
Notice: Carefully remove the sensor by pulling it straight out of the bore. DO NOT use a screwdriver or other device to try to pry the sensor out of the bore. Prying will cause the sensor body to break off in the bore.

Remove the wheel speed sensor from the bearing hub assembly.



Important: The mounting surface on the sensor must be flat in the next step in order to be mounted correctly on the bearing hub assembly. If the mounting surface on the sensor is warped or bent, the sensor must be replaced.

Inspect to see if the mounting surface on the sensor is flat. Check the mounting surface on the sensor head for flatness by placing it on the edge of a metal machinist's scale or other suitable straight edge to measure the flatness. Check the sensor for flatness in multiple positions/directions (minimum 3).
• If the sensor mounting surface is NOT flat (1), the sensor must be replaced. Proceed to the next step and replace the sensor.

• If the sensor mounting surface IS flat (2), the sensor IS to be reused. Proceed to Step 16.





Remove the wheel speed harness mounting clips from the knuckle (4) upper control arm (3) and frame (2).
Disconnect the wheel speed sensor electrical connector (1) from the vehicle wiring harness.
Connect the new wheel speed sensor harness electrical connector to the vehicle wiring harness.
Attach the wheel speed sensor harness to the frame, upper control arm, and the knuckle.



Temporarily plug the wheel speed sensor hole (1) in the bearing hub to prevent debris from entering it when you clean it.
Important: All rust and corrosion must be removed from the wheel speed sensor mounting surfaces on the bearing hub in the next step.

Using a wire brush, sandpaper, emery cloth, scotch brite, or equivalent, thoroughly clean the wheel speed sensor mounting surface (2) on the bearing hub to remove any rust of corrosion.
Using compressed air, remove all debris from the bearing hub surface.
Using a clean shop towel, clean the sensor and the O-ring.
Important: While the corrosion is drying in the next step, begin performing Steps 3-20 on the opposite side front wheel speed sensor.

Apply (spray) two thin coats of the specified rust penetrating lubricant (corrosion inhibitor) listed in this bulletin, to the complete sensor mounting surface on the bearing hub. Allow to dry for 3-5 minutes between coats.
When the corrosion inhibitor is dry to the touch (about 10 minutes), apply a light coating of the specified grease to the complete sensor mounting surface on the bearing hub and to the sensor and O-ring.
Remove the temporary plug from the hole in the bearing hub.
Install the wheel speed sensor in the bearing hub and install the bolt. Ensure that the sensor is seated flat against the hub.
Tighten
Tighten the wheel speed sensor mounting bolt to 18 N·m (13 lb ft).

Disconnect the front wheel speed sensor connector and place a digital volt meter (DVM) across the terminals of the wheel speed sensor connector. Rotate the bearing at approximately one revolution per second. The minimum reading should be at least 350 ACmVs. If the reading is less than 350 ACmVs, the wheel speed sensor must be replaced. Follow Steps 12-15 for instructions on replacing the wheel speed sensor. This step must be repeated after the new sensor has been installed.
Notice: Whenever the brake rotor has been separated from the wheel bearing flange, clean any rust or foreign material from the mating surface of the rotor and flange. Failure to do this may result in increased lateral runout of the rotor and brake.

Important: If the rotor was removed using the jack screw method, you must ensure that the hub flange is free of nicks or marks caused by this procedure. Remove all raised nicks or marks before installing the rotor.

Align the rotor to its original position on the hub and install the rotor.
Install the caliper and caliper mounting bracket assembly.
Perform the following procedure before installing the brake caliper bracket mounting bolts.
27.1. Remove all traces of the original adhesive patch.

27.2. Clean the threads of the bolt with brake parts cleaner, or the equivalent, and allow to dry.

27.3. Apply threadlocker to the threads of the bolts.

Install the caliper bracket mounting bolts.
Tighten the brake caliper mounting bracket mounting bolts to the specification listed below.

Tighten

• 1500 Series vehicles -- 175 N·m (129 lb ft)

• 2500 Series vehicles -- 300 N·m (221 lb ft)

Install the front tire and wheel assembly.
Tighten
Tighten the wheel nuts to 190 N·m (140 lb ft).

Complete Steps 21-30 on the opposite side front wheel speed sensor.
Lower the vehicle.
With the engine OFF, gradually apply the brake pedal to approximately 2/3 of its travel distance.
Slowly release the brake pedal.
Wait 15 seconds and repeat Steps 32-33 until a firm pedal is obtained. This will properly seat the brake caliper pistons and brake pads.
Customer Reimbursement - For Canada
Customer requests for reimbursement of previously paid repairs to correct the condition addressed in this bulletin are to be submitted by January 31, 2006.

All reasonable customer paid receipts should be considered for reimbursement. The amount to be reimbursed will be limited to the amount the repair would have cost if completed by an authorized General Motors dealer.

When a customer requests reimbursement, they must provide the following:

• Proof of ownership at time of repair.

• Original paid receipt confirming the amount of repair expense(s) that were not reimbursed, a description of the repair, and the person or entity performing the repair.

Claims for customer reimbursement on previously paid repairs are to be submitted as required by WINS.

Important: Refer to the GM Service Policies and Procedures Manual, section 1.6.2, for specific procedures regarding customer reimbursement verification.

Courtesy Transportation
The General Motors Courtesy Transportation program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranty. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product recall is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines.

Claim Information
Submit a Product Recall Claim with the information indicated below:

Repair Performed
Part Count
Part No.
Parts Allow
CC-FC
Labour Op
Labour Hours
Net Item

Inspect Wheel Speed Sensor (Inc. Cleaning)
0
N/A
N/A
MA-96
V1256
0.8*
***

Add: Vehicles with 8-lug nut wheels
0.1

Inspect & Replace One or Both Wheel Speed Sensor (Inc. Cleaning)
1-2
--
**
MA-96
V1257
0.9*
***

Add: Vehicles with 8-Lug Nut Wheels
0.1

Courtesy Transportation
N/A
N/A
N/A
MA-96
****
N/A
*****

Customer Reimbursement (Canadian & Export Dealers/US CAC)
N/A
N/A
N/A
MA-96
V1258
0.2
******

* -- For Recall Administrative Allowance, add 0.1 hours to the "Labour Hours".

** -- The "Parts Allowance" should be the sum total of the current GMSPO Dealer net price plus applicable Mark-Up for the front wheel speed sensor needed to complete the repair.

*** -- The amount identified in the "Net Item" column should represent the sum total of the current GMSPO Dealer net price plus applicable Mark-Up for the actual cost of lubricants needed to perform the required repairs, not to exceed $0.68.

**** -- Submit courtesy transportation using normal labor operations for courtesy transportation as indicated in the GM Service Policies and Procedures Manual.

***** -- The amount identified in the "Net Item" column should represent the actual dollar amount for courtesy transportation.

****** -- The amount identified in the "Net Item" column should represent the dollar amount reimbursed to the customer.


Refer to the General Motors WINS Claims Processing Manual for details on Product Recall Claim Submission.

Customer Notification
General Motors will notify customers of this recall on their vehicle (see copy of customer letter included with this bulletin).

Dealer Recall Responsibility -- All
All unsold new vehicles in dealers' possession and subject to this recall MUST be held and inspected/repaired per the service procedure of this recall bulletin BEFORE customers take possession of these vehicles.

Dealers are to service all vehicles subject to this recall at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward.

Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Recall follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter.

In summary, whenever a vehicle subject to this recall enters your vehicle inventory, or is in your dealership for service in the future, please take the steps necessary to be sure the recall correction has been made before selling or releasing the vehicle.

January 2005
Dear General Motors Customer:

General Motors has decided that a defect which relates to motor vehicle safety exists in certain 1999-2002 Chevrolet Silverado, 2000-2002 Chevrolet Tahoe, Suburban, 2002 Chevrolet Avalanche, 1999-2002 GMC Sierra, 2000-2002 GMC Yukon, Yukon XL vehicles located in Ontario, Quebec, Newfoundland, New Brunswick, Nova Scotia, and Prince Edward Island. These vehicles may have a condition permitting corrosion to occur between the front hub/bearing assembly and the wheel speed sensor. If the brakes are applied while the vehicle is travelling at a speed of greater than 6 km/h (3.7 mph) but less than 16 km/h (10 mph), the corrosion may cause an unwanted anti-lock brake system (ABS) activation. If this condition occurred where stopping distance is limited, a crash could occur.

Your dealer will clean and treat the affected area, and in some cases, replace the front wheel speed sensor. This service will be performed for you at no charge.

You may be contacted by a dealer other than the dealer who sold or is currently servicing your vehicle. Please be advised that you may take your vehicle to the General Motors dealership of your choice to have the recall service work completed. Please contact your dealer as soon as possible to arrange a service date.

If parts are required, ask your dealer for details regarding their availability. If parts are not in stock, they can be ordered before scheduling your service date.

This letter identifies your vehicle. Presentation of this letter to your dealer will assist their Service personnel in completing the necessary correction to your vehicle in the shortest possible time.

If you have already paid for some or all of the cost to replace the front wheel speed sensor(s) due to corrosion, and you have not received reimbursement under a Vehicle Service Contract, you should contact your dealer to seek reimbursement. Please provide your dealer with your original paid receipts or invoices verifying the repair, the amount charged, proof of payment, the date of payment of those charges, and proof of ownership of the vehicle at the time of the repair. Your request for reimbursement, including the information and documents mentioned above, must be received by your dealer by January 31, 2006. Reimbursement may be limited to the amount the repair would have cost if completed by an authorized General Motors dealer.

We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your safety and continued satisfaction with our products.

Customer Support Department

General Motors of Canada Limited

04094



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


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Document ID# 1587153
2000 Chevrolet Chevy K Pickup - 4WD

First thing that needs to be done is to scan it.

The first thing I'd do is check the brake fluid level. Then what everyone else said.

Of course the fluid is full, but I did double check it to avoid a "DOH" (Homer Simpson) moment...

Nothing comes up on my generic OBD II scanner, my buddy just picked up a new SnapOn scanner, it is supposed to have some advanced scanning capabilities, I'll take it by his shop sometime next week.

I have had a wheel sensor fail on my Jeep, causing ABS activation at low speeds. I actually forgot the install the sensor rings when I changed the axles...

The ABS is not engauging at low speeds so I don't believe I am experiencing what doc #1587153 is describing. It's also a California truck with very little corrosion on anything so I am reluctant to tear into the sensors... However I sincerely appreciate your post Salty oysters, thanks!

My inclination is that the ABS control board may be failing? I seem to recall it being a source of problems for this vintage of truck?

Please keep the suggestions coming.

Thanks,
Mike

(Message edited by mikeski on November 24, 2007)

I had the common ABS module board failure in my '99 Silverado Z71. When it went out, the ABS pump started running constantly, and would not shut off until I pulled the relay. Doesn't sound like you are experiencing any symptoms other than the light, though?

GM replaced it for free, but the truck was around 3 yrs old / 50k miles at the time. I'm sure you could convince them it's a safety issue, though.

Come to think of it, I don't think my ABS or brake idiot lights ever even came on when the board died.

My boxers chewed the wire going to the wheel speed sensor on the passenger front side. That caused my abs light to come on.

Document ID# 1988903
2000 Chevrolet Chevy K Silverado - 4WD


--------------------------------------------------------------------------------


Subject: ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) #04-05-25-002D - (06/14/2007)



Models: 2004-2007 Buick Rainier

2002-2006 Cadillac Escalade, Escalade EXT

2003-2006 Cadillac Escalade ESV

1999-2007 Chevrolet Silverado Classic

2000-2006 Chevrolet Suburban, Tahoe

2002-2006 Chevrolet Avalanche

2002-2007 Chevrolet TrailBlazer, TrailBlazer EXT

2003-2006 Chevolet SSR

1999-2007 GMC Sierra Classic

2000-2006 GMC Yukon, Yukon Denali, Yukon XL

2002-2007 GMC Envoy, Envoy XL, Sierra Denali Classic

2004-2005 GMC Envoy XUV

2002-2004 Oldsmobile Bravada




--------------------------------------------------------------------------------

This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 04-05-25-002C (Section 05 -- Brakes).


--------------------------------------------------------------------------------

Condition
Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module.

Cause
A poor connection at the EBCM ground is causing unnecessary replacements of brake modules.

Important: The EBCM Ground is different for each application. Refer to the list below for the proper ground reference:

• Midsize Utilities = Ground 304

• SSR = Ground 400

• Fullsize Trucks and Utilities = Ground 110


Correction
DO NOT REPLACE THE BRAKE MODULE.

Perform the following steps to improve the connection of the EBCM Ground:

Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire.
Clean the area, front and back, using a Whiz Wheel®.
Install the ground, then the washer and then the bolt to the frame.
Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish.

Install a washer and nut to the back side of the frame.
Tighten
Tighten the nut to 9 N·m (79 lb in).

Cover the front and back side of the repair area using Rubberized Undercoating.
An additional check can be made to ensure a good connection for the Battery Cable to Frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above.

Parts Information
FULL-SIZE TRUCKS, SUVs AND H2

Part Number
Description

11588564
Bolt

15650962
Washer

15672934
Nut

12378398

(in Canada, 10952414)
Rubberized Undercoating -- Paintable

MIDSIZE SUVs

Part Number
Description

11517555
Bolt

15650961
Washer

11503749
Nut

12378398

(in Canada, 10952414)
Rubberized Undercoating -- Paintable


Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

N9502
Ground Repair - EBCM Ground
0.2 hr




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------

you will need to check abs codes with a tech2Document ID# 1988903
2000 Chevrolet Chevy K Silverado - 4WD


--------------------------------------------------------------------------------


Subject: ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) #04-05-25-002D - (06/14/2007)



Models: 2004-2007 Buick Rainier

2002-2006 Cadillac Escalade, Escalade EXT

2003-2006 Cadillac Escalade ESV

1999-2007 Chevrolet Silverado Classic

2000-2006 Chevrolet Suburban, Tahoe

2002-2006 Chevrolet Avalanche

2002-2007 Chevrolet TrailBlazer, TrailBlazer EXT

2003-2006 Chevolet SSR

1999-2007 GMC Sierra Classic

2000-2006 GMC Yukon, Yukon Denali, Yukon XL

2002-2007 GMC Envoy, Envoy XL, Sierra Denali Classic

2004-2005 GMC Envoy XUV

2002-2004 Oldsmobile Bravada




--------------------------------------------------------------------------------

This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 04-05-25-002C (Section 05 -- Brakes).


--------------------------------------------------------------------------------

Condition
Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module.

Cause
A poor connection at the EBCM ground is causing unnecessary replacements of brake modules.

Important: The EBCM Ground is different for each application. Refer to the list below for the proper ground reference:

• Midsize Utilities = Ground 304

• SSR = Ground 400

• Fullsize Trucks and Utilities = Ground 110


Correction
DO NOT REPLACE THE BRAKE MODULE.

Perform the following steps to improve the connection of the EBCM Ground:

Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire.
Clean the area, front and back, using a Whiz Wheel®.
Install the ground, then the washer and then the bolt to the frame.
Important: It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish.

Install a washer and nut to the back side of the frame.
Tighten
Tighten the nut to 9 N·m (79 lb in).

Cover the front and back side of the repair area using Rubberized Undercoating.
An additional check can be made to ensure a good connection for the Battery Cable to Frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above.

Parts Information
FULL-SIZE TRUCKS, SUVs AND H2

Part Number
Description

11588564
Bolt

15650962
Washer

15672934
Nut

12378398

(in Canada, 10952414)
Rubberized Undercoating -- Paintable

MIDSIZE SUVs

Part Number
Description

11517555
Bolt

15650961
Washer

11503749
Nut

12378398

(in Canada, 10952414)
Rubberized Undercoating -- Paintable


Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

N9502
Ground Repair - EBCM Ground
0.2 hr




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------

thanks Salty!

It definately acts like a grounding problem. That's an easy fix, I will try to clean up the ground and see it that helps.

Mike

Get your buddy to scan it before you disconnect anything. The latest software in the Snap-on scanner has full capabilities, no need for a Tech 2. You can then watch and if it is a Modis or Solus Pro graph out the wheel speed sensors etc. to see what is failing. Of course the codes may lead you in a completely different direction.

If you need factory type info send me an email (In my profile) and I will get you set up.

salty... Dont want to stir up any bad feelings here but I know you are trying to help out but your gonna get your but in a sling if the general finds out you are posting their info off SI...it is copy right infringment. I would keep the copy then pasting on a down low and just give advise. Just my suggestion. I also work for the general.

10-4 , scotter