Allison Transmission - Vehicle Shudder When Driving in 6th Gear Range (Reprogram Transmission Control Module (TCM))
| Subject: | Allison Transmission -- Vehicle Shudder When Driving in 6th Gear Range (Reprogram Transmission Control Module (TCM)) |
| Models: | 2006 Chevrolet Silverado 2500 (¾ Ton) and 3500 (1 Ton) Series |
| 2006 GMC Sierra 2500 (¾ Ton) and 3500 (1 Ton) Series |
| with 6.6L Diesel Engine (RPO LBZ/LLY) and Allison Transmission (RPO MW7) |
Condition
Some customers may comment on a shudder that is only present at vehicle speeds between 74 km/h (46 mph) and 79 km/h (49 mph) when driving at constant speed in 6th gear range in Four-Wheel High mode.
Correction
A new calibration has been released to correct this condition. This new calibration will change the minimum powered 6-5 downshift point to approximately 82 km/h (51 mph), allowing the transmission downshift to occur prior to the speed and load range that causes the shudder.
Reprogram the transmission control module (TCM) with the new service calibrations contained in TIS version 6.0 or later, which was released on May 28, 2006.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
K5364 | Transmission Control Module - Transmission Reprogramming with SPS | 0.4 hr |
