A P0011 code typically indicates a problem with the camshaft timing. When the gas engine encounters issues, it's common for the hybrid system to go into a limp mode to protect the components. As a result, the hybrid battery may remain at a low charge state.
If you're experiencing this, it's important to have your vehicle checked by a mechanic to diagnose and address the underlying camshaft timing issue. Once the problem is resolved, the hybrid system should function normally again.