Transmission Will Not Stay in Forward or Reverse

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Condition	Action
Low fluid	Adjust the fluid level. Refer to Transmission Fluid Checking Procedure .
Leaking at solenoid assembly	Replace the solenoid assembly. Refer to Control Valve Solenoid Replacement (Solenoid A, B) or Control Valve Solenoid Replacement (Solenoid C, D, E, F, G) .
Low pressure	Repair the transmission.
Faulty solenoid - leaking	Replace the solenoid. Refer to Control Valve Solenoid Replacement (Solenoid A, B) or Control Valve Solenoid Replacement (Solenoid C, D, E, F, G) .