No First and Reverse Gears

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Checks	Causes
Hybrid Low 1-2 Clutch Assembly	Inspect for damaged or worn low and 1-2 clutch plates. Inspect for damaged 1-2 clutch backing plate. Inspect for worn splines on backing plate. Inspect for damaged 1-2 clutch backing plate retaining ring. Inspect for damaged 1-2 clutch piston assembly, spring, spring retaining ring, and center support assembly.
Output Carrier Assembly	Inspect for damaged or stripped splines on the output carrier assembly.