GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T60-E 🢒 High or Low Upshift or Downshift Speed

High or Low Upshift or Downshift Speed for Buick Century 1999

1-2 Shift Speed - High or Low

Checks

Cause

Definition: Shift speeds outside the calibrated range.

Refer to Shift Speed .

VSS rotor

Incorrect tooth count on VS Sensor Rotor

PCM calibration

Incorrect PCM calibration

Final drive

Final drive ratio or model incorrect