For 1990-2009 cars only
LP1/LY7 Intermittent Engine Chuggle at Highway Speeds During Light Throttle Load (Reprogram Transmission Control Module (TCM))
| Subject: | LP1/LY7 Intermittent Engine Chuggle at Highway Speeds During Light Throttle Load (Reprogram Transmission Control Module (TCM)) |
| Models: | 2004-2005 Cadillac CTS, SRX, STS |
| with 2.8L or 3.6L V6 Engine (VINS T, 7 -- RPOs LP1, LY7) and Automatic Transmission |
Condition
Some customers may comment on an intermittent engine chuggle at highway speeds (typically above 100 km/h (62 mph)) during light throttle load.
Cause
This condition may be due to engine torque variation when the torque converter clutch (TCC) is at full lock.
Correction
A new transmission control module (TCM) calibration update has been released to correct this condition. This new calibration changes TCC full lock operation to a higher vehicle speed. Reprogram the TCM using SPS. This new calibration is available on TIS2WEB.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
K5364 | Transmission Control Module Reprogramming with SPS | Use Published Labor Operation Time |
