For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2006 🢒 GMC Sierra Denali 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Transmission Will Not Make a Specific Shift

Transmission Will Not Make a Specific Shift for GMC Truck GMC Sierra Denali 2006

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.