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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 37 (Automatic Transmission - ALLISON - Service, Diagnosis & Troubleshooting) >> Transmission Will Not Make a Specific Shift

Transmission Will Not Make a Specific Shift

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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 Checking Procedure .
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.