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Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Rocker arm oil control solenoid A (bank 1) failure
Rocker arm oil control solenoid A (bank 1) VTSB1 line open
Rocker arm oil control solenoid A (bank 1) VTSB1 line short
Rocker arm oil pressure switch A (bank 1) failure
Rocker arm oil pressure switch A (bank 1) VTMB1 line open
Rocker arm oil pressure switch A (bank 1) VTMB1 line short
Oil passage clogged