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Hesitation or Flat Spot Between 56-80 km/h (35-50 mph) (Reprogram Transmission Control Module)

Subject:Hesitation or Flat Spot Between 56-80 km/h (35-50 mph) (Reprogram Transmission Control Module)

Models:2008 Buick Enclave
2007-2008 GMC Acadia
2007-2008 Saturn OUTLOOK
with FWD or AWD



This bulletin is being revised to correct the formatting of the table for the paper version of this bulletin. The electronic version in SI was correctly formatted. Please discard Corporate Bulletin Number 08-07-30-022 (Section 07 -- Transmission/Transaxle).


Condition

Some customers may comment on a flat spot or hesitation between 56-80 km/h (35-50 mph) 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.

To obtain this calibration, contact Techline (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French). Techline will reconfigure the vehicle to make this calibration the default calibration for this vehicle.

The table below shows the Shift Pattern Change at Light Throttle.

--

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

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation

Description

Labor Time

K5364

Transmission Control Module Reprogram with SPS

Use Published Labor Operation Time