What does the engine code po 651 mean on a cz corvette

Question

A 2004 cz corvette with several different codes hoping someone with some knowledge of this can help out

Answer 1

P0651 Sensor reffernce voltage

B2647 Ambient light sensor low

B0026 Airbag deployment loop.

The MAP sensor and the  Engine Oil  Pressure sensor  these 2 sensor recieve a 5 volt refference voltage and are bused together if the MAP or the EOP sensor short to power it affect both sensor, As for the ambient light code this is the ambient light sensor you will spend more time testing this unit than replacing the unt.