For 1990-2009 cars only
5-4 Shift Busyness (Excessive Shifting) While Using Cruise Control and Towing (Reprogram PCM)
| 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® 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
Calibration Number | Description |
|---|---|
15097103 | New Calibration to Address Excessive Shifting with Cruise On and Idle Surge |
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:
Labor Operation | Description | Labor Time |
|---|---|---|
J6355 | Powertrain Controller -- Reprogram | 0.4 hr |
