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Home >> GMC >> 2005 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 222 (Automatic Transmission - 5L40-E/5L50-E - Service, Diagnosis & Trouble Shooting) >> Road Test Procedure >> Full Throttle Detent Downshift

Full Throttle Detent Downshift

WARNING: This page is about a different car, the 2005 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Accelerate the vehicle to speeds of 64-88 km/h (40-55 mph) in FIFTH gear.
  2. Quickly increase throttle angle to 100 percent (WOT).
  3. Verify the following:
    • The TCC releases
    • The transmission downshifts immediately to THIRD gear
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