Error codes and lots of B.S.

[f5fstop]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Planohummer:
stab syst/trac failed can be a simple brake switch adjustment. Both of those with the 4wd failure message and 4wd buttons not lighting up is a different issue. for some reason, cold weather snaps aggravate the condition. GM and Borg-Warner(xfer case mfr) are ACTIVELY involved at this point. Even when TCCMs are replaced, problem still pops up at times. </div></BLOCKQUOTE>

Correct if the brake light switch is out of adjustment, normally only the stab error is flashed (indicator lights are not affected). (This is from a GM PI: A large number of brake stop lamp switches are being returned to the Warranty Parts Return Center for the customer complaint of Stabilitrak light on and a DIC message of service Stabilitrak system. The stop light switches are found to be functional. Please assure that the switch is properly adjusted as outlined in SI document number 1605842 prior to replacing the switch.
In addition, another problem could be a the program internal to the TCCM. Bulletin #05-04-21-006 covered this problem, but for the reprogram, the following codes would be displayed: B0790, B2725, C0359, and the vehicle would have been built before two specific VINs (depending on content).
I do know from a friend, the TCCM, BCM and Encoder modules are being replaced when not necessary. There are other things such as bad connectors, loose connectors, etc., that can cause the same problems. Service engineering is working on the problem, but so far from what I can find out, nothing has been locked in as the root cause of these problems. Eventually, the warranty will rise to the point that an engineering Red X team will take over and work on just this one item until the root cause is found, that the problem repaired.

Normally, but not necessarily true at all times, if the four wheel drive message is also displayed, it is the encoder motor, if only stab and traction with no lights, it is the TCCM. But that is not always been true, so a tech who knows how to perform the required diagnostics to locate the actual problem is required.
Some dealers are getting so frustrated, they are throwing parts at the problem, and the problem might have been a connector not seated properly, but when the component is replaced, the tech then installs the connector properly and they believe the part was bad.
When returned to the WPC, no trouble is found. This only happens when a tech does not check all the connections when troubleshooting.

As for the brake switch adjustement:
1. Rotate the switch counterclockwise, allowing the retainer to release.
2. Pull the brake pedal rearward to full stop.
Important: Do not move the brake pedal during switch adjustment as this will cause an over-adjusted switch which could cause brake drag.


3. While holding the brake pedal FIRMLY in position rearward, push the switch inward fully until the switch body contacts the brake pedal arm striker plate. At this point the plunger in the switch should be pushed in.
4. Rotate the switch clockwise until a "click" is heard.
5. The switch is properly adjusted when there is 7 mm (0.028 in) clearance between the end of the switch barrel and the striker plate on the brake pedal arm.

If I'm not mistaken the brake switch is the switch on the left, the right switch is for TCC Brake/Cruise release.