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Home >> Pontiac >> 2008 >> Grand Prix Base >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transaxle - 4T65-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Diagnostic Information and Procedures >> Second Gear Only

Second Gear Only

Second Gear Only

Checks Cause
DEFINITION: The transmission only provides second gear in Drive range. The vehicle accelerates from a stop in second gear and does not upshift. Second gear ratio is 1.568:1.
Control Valve Body Assembly
  • The 1-2 shift valve (318) is stuck or binding.
  • Debris is found in the control valve body (301) or the control valve body spacer plate and gasket assembly (396)
Input Carrier Assembly
  • A damaged input sun gear (668)
  • Damaged input carrier (672) planetary pinions
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