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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 920 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Diagnostic Information And Procedures >> Transmission Will Not Make a Specific Shift

Transmission Will Not Make a Specific Shift

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Transmission Will Not Make a Specific Shift

Condition Action
Low engine power Correct the engine condition.
Extreme fluid temperature Inspect the cooling system and fluid level. Refer to Transmission Fluid Check .
Faulty speed sensor/circuit Repair the circuit or replace the speed sensor or sensors. Refer to Speed Sensor Replacement .
Faulty temperature sensor/circuit Inspect for a temperature reading which inhibits shifts.
Faulty or misadjusted shift selector Repair the shift selector.