K 3500 Truck 4WD V8-6.6L DSL Turbo VIN 1 (2001)
PROM - Programmable Read Only Memory: Customer Interest
A/T - Allison 1000 Series Shift Busyness
File In Section: 07 - Transmission/Transaxle
Bulletin No.: 01-07-30-034
Date: November, 2001
TECHNICAL
Subject:
5-4 Shift Busyness (Excessive Shifting) While Using
Cruise Control and Towing (Reprogram PCM)
Models:
2001 Chevrolet and GMC C/K 2500/3500 (3/4 and 1 Ton)
Series Pickup Models (Silverado and Sierra)
with 6.6L Diesel Engine (VIN 1 - RPO LB7)
and Allison(R) Series 1000 Automatic Transmission (RPO M74)
Condition
Some customers may comment on 5-4 shift busyness (excessive shifting) when towing a trailer and using cruise control. This condition usually occurs on
roadways with an up and down (hilly) surface grade.
Correction
To improve excessive shifting, reprogram the Powertrain Control Module (PCM) using the new calibration listed below.
Calibration Information
This calibration is an electronic calibration and is NOT available from GMSPO. It will be available from Techline starting October 2001, on the
TIS2000 version 10.0.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
