Transmission Will Not Stay in Forward or Reverse. GMC Truck Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Transmission Will Not Stay in Forward or Reverse

Condition	Action
Low fluid	Adjust the fluid level. Refer to Transmission Fluid Check .
Leaking at solenoid assembly	Replace the solenoid assembly. Refer to Control Valve Solenoid Replacement .
Low pressure	Repair the transmission.
Faulty solenoid - leaking	Replace the solenoid. Refer to Control Valve Solenoid Replacement .