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Manual Downshifts

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.

The shift solenoid valves do not control the 4-3 manual downshift. The 4-3 manual downshift is hydraulically controlled. The 3-2 and 2-1 manual downshifts are electronically controlled. The solenoid states will change during or shortly after a 4-3 downshift is selected.

4-3 Downshift

  1. Place the gear selector in the O/D position. Accelerate the vehicle to 40-55 MPH in 4th gear. Release the throttle while moving the gear selector to 3rd.
  2. Verify the TCC releases, the transaxle downshifts immediately to 3rd gear, and the engine slows the vehicle.

4-2 Downshift

  1. Place the gear selector in the O/D position. Accelerate the vehicle to 40-45 MPH. Release the throttle while moving the gear selector to 2nd.
  2. Verify the TCC releases, the transaxle downshifts immediately to 2nd gear, and the engine slows the vehicle.

4-1 Downshift

  1. Place the gear selector in the O/D position. Accelerate the vehicle to 40 MPH. Release the throttle while moving the gear selector to 1st.
  2. Verify the TCC releases, the transaxle downshifts immediately to 2nd gear, the engine slows the vehicle, and the transaxle downshifts to 1st gear at the calibrated speed, typically 30-40 MPH.
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