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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 362 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> No Second and Sixth Gear

No Second and Sixth Gear

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No Second and Sixth Gear

Checks Causes
A/Trans Fluid Pan Assembly (29) Verify proper fluid level and condition, inspect transmission assembly for leaks.
Control Valve Upper Body Assembly (304) Inspect for sticking, damaged, or worn 2-6 clutch regulator valve (334) and spring (326).
Control Solenoid (w/Body and TCM) Valve Assembly (314) Pressure control solenoid 4 commanded/failed LOW (off) or leaking - Perform solenoid valve assembly function test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
Center (with 2-6 Low and Reverse Clutch) Support Assembly (67)
  • Inspect for proper installation of the 2-6 clutch return spring retaining ring (455).
  • Inspect for damaged 2-6 clutch piston assembly (457), spring (456), retaining ring (455), and center support housing (459).
  • Inspect for worn or damaged 2-6 clutch plates (451-453).
Center Support Fluid Passage Seal Assembly (20)
  • Inspect for worn, cut, or damaged seals.
  • Inspect for proper seal (20) size (6L45/50E MYA/MYB) vs (6L80/90E MYC/MYD).
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