For 1990-2009 cars only
Driveline Clunk When Stopping (Reprogram Powertrain Control Module (PCM))
| 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:
Labor Operation | Description | Labor Time |
|---|---|---|
K5364 | Transmission Control Module (TCM) - Reprogram | 0.4 hr |
Add | To Diagnosis | 0.0 -- 0.3 hr |
