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Full Throttle Detent Downshift

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place the gear selector in the O/D position.
  2. Accelerate the vehicle to speeds of 40-55 MPH in 4th gear.
  3. Quickly increase throttle angle to 100 percent.
  4. Verify the following:
    • The TCC releases.
    • The transaxle downshifts immediately to 2nd gear.
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