Condition
Some customers may comment on a flat spot or hesitation between 35-50 mph (56-80 km/h) speed range.
Cause
The existing transmission calibration is programmed to maximize fuel economy and requires a greater throttle input than some customers would prefer to provide acceleration in this speed range.
Correction
A new calibration is available. This new calibration increases the speed required to obtain upshifts and removes TCC apply from 2nd to 3rd gear, thereby reducing engine lugging and improving vehicle response to accelerator input.
Important: This calibration will have a negative impact on fuel economy of 0-1.2 L/100 km (0-2 mpg) combined driving.
| — | Current Calibration | New Calibration | ||||
| Shift | MPH | KPH | MPH | KPH | ||
| 1–2 | 8 | 13 | 12 | 19 | ||
| 2–3 | 18 | 29 | 20 | 33 | ||
| 3–4 | 24 | 40 | 31 | 50 | ||
| 4–5 | 32 | 53 | 43 | 69 | ||
| 5–6 | 44 | 71 | 56 | 90 | ||
| TCC Applied | 2nd, 3rd, 4th, 5th, 6th | 4th, 5th, 6th | ||||
Applicable Models:
2007-’08 Saturn Outlook
2007-’08 GMC Acadia
2008 Buick Enclave
Courtesy of MotoLOGIC® Repair & Diagnostics
