Service Stability And Engine Light Codes

[dmjohnson]

Here is my issue: While driving my 2005 Yukon Denali at 30 mph, ALL the following lights came on and started dinging: 1. "Service stability" message, 2. ABS light, 3. Parking brake light 4. traction control light. They have remained on.

 

I took it in to have the engine codes lights read. They gave me 2 codes. PO856 Traction Control Torgue Request, and U1041 Loss of EBCM/EBTCM Communication.

 

Can you give me some ideas on where to start troubleshooting this?

[ChevyTech77]

Check power and ground supplies to the ebcm using a halogen headlamp bulb as a test light.

[OKLAGMCRUISER]

CHECK fuses first...

[dmjohnson]

CHECK fuses first...

 

Cigarette lighter fuse was out,I replaced. not sure how to test with bulb,or if I have correct wires. I removed 12 Gauge wire and cleaned terminal and frame, no difference. please advise and Thanks!!

[ChevyTech77]

CHECK fuses first...

 

Cigarette lighter fuse was out,I replaced. not sure how to test with bulb,or if I have correct wires. I removed 12 Gauge wire and cleaned terminal and frame, no difference. please advise and Thanks!!

 

Try and NOT take this the wrong way but if you don't know how to check for power and ground to the module, how do you expect us to help you? Please, just take it to a reputable repair facility.

[Duelin]

Document ID# 1734167

2004 Chevrolet Chevy C Silverado - 2WD

 

 

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Subject: ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) #04-05-25-002C - (11/23/2005)

 

 

 

Models: 2004-2005 Buick Rainier

 

2002-2006 Cadillac Escalade, Escalade EXT

 

2003-2006 Cadillac Escalade ESV

 

1999-2006 Chevrolet Silverado

 

2000-2006 Chevrolet Suburban, Tahoe

 

2002-2006 Chevrolet Avalanche

 

2002-2005 Chevrolet TrailBlazer, TrailBlazer EXT

 

2003-2005 Chevolet SSR

 

1999-2006 GMC Sierra

 

2000-2006 GMC Yukon, Yukon Denali, Yukon XL

 

2002-2005 GMC Envoy, Envoy XL

 

2002-2006 GMC Sierra Denali

 

2004-2005 GMC Envoy XUV

 

2002-2004 Oldsmobile Bravada

 

 

 

 

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This bulletin is being revised to provide further diagnostic information and add 2006 model year full-size vehicles. Please discard Corporate Bulletin Number 04-05-25-002B (Section 05 -- Brakes).

 

 

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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

[mikeyfz35027]

How about a 2005 Tahoe showing dash lights with traction control diasabled, e brake engaged and display saying "service brake system" "stablility system disabled".. this happenes when the brake pedal is compressed all the way to the floor. Brake is also soft

[gmtech4]

you have codes that need to be diagnosed ,,,,,

 

read owners manual for more info on DIC messages and lights on IPC