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) ground line open
• PCM internal circuit failure