Traction Control System

Have it scanned by a pro it may be a calibration problem with abs unit or steering wheel sensor like a bent terminal or poor connection on that. See pic

Forgot there are a couple tsb's on this

Bulletin No: 05-05-25-008

Date: October 05, 2005

TECHNICAL

Subject:
Service Stabilitrak(R) Message or Intermittent Stabilitrak(R) Activation During Normal Driving, Diagnostic Trouble Code (DTC) C0455 (Inspect/Repair Steering Wheel Position Sensor (SWPS) Connector and Reprogram Electronic Brake Control Module (EBCM))

Models:
2004-2006 Cadillac Escalade Models
2004-2006 Chevrolet Avalanche, Suburban, Tahoe
2004-2006 GMC Yukon Models

with Control, Active Brake (RPO JL4)

Condition

Some customers may comment on a Service Stabilitrak(R) message or intermittent Stabilitrak(R) activation during normal driving.

When interrogating with the Tech 2(R), the technician may find a DTC C0455.

Cause

There are multiple possible causes for this issue. This bulletin will address the two most likely causes.

A bent terminal or poor connection at the SWPS may be one possible cause.

The vehicle stability enhancement system (VSES) electronic brake control module (EBCM) calibration may be the other possible cause.

Correction

1. Remove the SWPS connector located at the base of the STRG column.

2. Inspect the SWPS connector terminals for bent of loose terminals.

3. Inspect the SWPS terminals for bent or loose terminals.

Important:
DO NOT replace the SWPS or connector if bent or loose terminals are found.

4. If either the SWPS terminals or SWPS connector terminals are bent or loose, repair the terminals.

5. Reprogram the VSES EBCM with TIS version 9.0 released on 9/04/05 or later.

Warranty Information

Bulletin No: 04-08-49-006C

Date: January 05, 2005

TECHNICAL

Subject:
Service Stability Message Displayed, DTC C0550 Set (Reprogram EBCM)

Models:
2004-2005 Cadillac Escalade, Escalade ESV, Escalade EXT
2004-2005 Chevrolet Avalanche, Suburban, Tahoe
2004-2005 GMC Yukon, Yukon Denali, Yukon XL

Supercede:

This bulletin is being revised to correct the Subject line. Please discard Corporate Bulletin Number 04-08-49-006B (Section 08 - Body and Accessories).

Condition

Some customers may comment that while driving downhill and making a turn, the Service Stability message will display in the Driver Information Center (DIC). This will occur prior to ABS activation and once stopped, the message will go off.

Upon investigation, the technician may find DTC C0550 stored in history.

Cause

The cause of this condition may be that the "Long Accel Gain" parameters in the EBCM are sensitive to certain driving conditions.

Correction

Technicians are to reprogram the EBCM with an updated software calibration. This new service calibration was released with TIS satellite data update version 9.5 available September 20, 2004. As always, make sure your TECH 2(R) is updated with the latest software version.

Both involve reprogramming of the computer

You will need to find a shop with a scan tool capable of scanning the suspension system to retreive any trouble codes that are causing the system to disable. The computer is seeing a problem somewhere and shutting it down, pulling the codes is the only way to pinpoint the problem, there are too many possibilities to just guess

Check the fuel pressure, change the fuel filter, and then check the engine vacuum. If you have 15 " of vacuum at idle you may have a plugged converter.

Scan abs unit for a problem a pro will have to do this. When abs goes out it knocks out stability system and traction control.

The truck has to be scanned to see what's wrong then fixed and scan tool has to take out the code when done.

How did you verify the ecbm was bad? Codes never identify bad parts, just failed systems.

You need to check all wiring.
I will look up the code and send you the diag tree for this.

Roy