The code B1855 OBD2 exactly means to the camshaft timing. In the case, if the cam timing is over-retarded, the car engine light will be illumined and the code will be set when the car is tested. Engine Off Self-Test, Power Steering Pressure Switch Malfunction in Key On, this DTC specifies the PSP effort to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Navigation wheel must be twisted during Key On, Engine Running Self-Test PSP switch or shorting bar spoiled SIG RTN circuit open PSP circuit shorted to SIGRTN PCM spoiled.