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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 155 (Automatic Transmission - 6L50/6L80/6L90 - Service, Diagnosis & Troubleshooting) >> Road Test >> Part Throttle Detent Downshift

Part Throttle Detent Downshift

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Cadillac Escalade EXT, 2007 Cadillac Escalade ESV, and 2007 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Place the gear selector in the DRIVE position.
  2. Accelerate the vehicle to 64-88 km/h (40-55 mph) in 6th gear.
  3. Quickly increase throttle angle to between 25-30 percent.
  4. Verify the following:
    • The TCC releases.
    • The transmission downshifts immediately.
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