Drivetrain - Driveline Clunk When Stopping
Bulletin No.: 03-07-30-028Date: June 27, 2003
TECHNICAL
Subject:
Driveline Clunk When Stopping (Reprogram Powertrain Control Module (PCM))
Models:
2003 Cadillac Escalade, Escalade ESV, Escalade EXT
2003 GMC Yukon Denali, Yukon Denali XL
2003 HUMMER H2
with 6.0L Engine (VINs N, U - RPOs LQ9, LQ4) and 4L65E Automatic Transmission (RPO M32) and AWD Transfer Case (RPO NR3)
or
2003 Chevrolet Suburban, Tahoe
2003 GMC Yukon, Yukon XL
with Stabilitrak System (RPO JL4) and 4WD Transfer Case (RPO NR4)
Condition
Some customers may comment on a clunk noise when stopping. This noise may occur on a 3-2 downshift at approximately 24 km/h (15 mph) and may be more noticeable on quicker stops.
Cause
This condition may be caused by lash in the driveline.
Correction
A revised calibration has been released that will eliminate the 3-2 downshift and create a 3-1 downshift instead.
Reprogram the PCM using the new service calibration, which was available from Techline starting June 2, 2003 on the TIS2000 version 6.0 or later. This calibration is an electronic calibration and is not available from GMSPO.
Warranty Information.
For vehicles repaired under warranty, use the table.
Disclaimer