The genuine meaning of the B2566 Code is provided by the manufacturer of the car and car engine. The B2566 OBD2 precisely refers to the camshaft timing. In this case, if the cam timing is over-retarded, the engine light will be illumined and the code will be established. Engine Running Self-Test, this DTC shows that the PSP input did not modification state. Navigation wheel must be twisted during Key On, Engine Running Self-Test PSP switch or shorting bar hurt SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM injured. The dictionary meaning of the code is not useful.