P2c7a Code Chevy Silverado

I have a chevrolet silverado 2500 hd with a 6.6 diesel. i have a check A43c e55a

I have a Chevrolet Silverado 2500 HD with a 6.6 diesel. I have a check

I have a Chevrolet Silverado 2500 HD with a 6.6 diesel. I have a check

I have a Chevrolet Silverado 2500 HD with a 6.6 diesel. I have a check

I have a Chevrolet Silverado 2500 HD with a 6.6 diesel. I have a check