STS RWD V8-4.6L VIN A (2006)
Suspension Control Module: All Technical Service Bulletins
Suspension - Groaning/Shuddering On Low Speed Bumps
Bulletin No.: 06-03-11-001
Date: June 13, 2006
TECHNICAL
Subject:
Groaning or Shuddering Noise At Low Speeds When Driving Over Low Profile Bumps (Update Electronic Suspension Control Module Software)
Models:
2005-2006 Cadillac STS
with Electronic Suspension Control (RPO F55)
Condition
Some customers may comment on a groaning or shuddering noise at low speeds when driving over low profile bumps.
Cause
This condition may be caused by the Electronic Suspension Control (ESC) system overcompensating at slow speeds due to road inputs. The groaning
noise occurs in the ESC shock absorbers due to excessive fluctuating commands.
Correction
To prevent this condition from occurring, a new software application and calibration have been released. This software update will modify the
ESC activation rates at lower speeds, preventing the ESC from overcompensating when driving over gradual bumps at low speeds. This software
update will improve performance at slow speed but maintain the current performance during normal driving conditions. The new
software/calibrations will not affect the response or safety of the vehicle's suspension system.
Technicians are to reprogram the ESC module with an updated software calibration. The new calibration will be released beginning with TIS
satellite data update version 6.5 to be available on June 12, 2006. As always, make sure your Tech 2® is updated with the latest software version.
Warranty Information
For vehicles repaired under warranty, use the table.
