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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1734 (Automatic Transmission - 6L45/6L50/6L80/6L90 - Symptom Troubleshooting And Diagnosis) >> Shift Indicator Indicates Wrong Gear Selection

Shift Indicator Indicates Wrong Gear Selection

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Checks Causes
Shift Cable
  • Inspect for damage.
  • Verify proper attachment to shifter.
  • Verify cable is locked into shifter bracket.
  • Verify cable is properly attached to the transmission.
  • Verify that the cable is locked into the transmission bracket.
Manual Shaft
  • Verify shift lever is properly attached to the manual shaft.
  • Verify manual shaft is not twisted or damaged.
Manual Shift Detent Lever with Shaft Position Switch Assembly, IMS Verify proper operation. Refer to Transmission Internal Mode Switch Logic .