Code result
P2647
A Rocker Arm Actuator System Stuck On Bank 1
Moderate severity
What it means
On variable valve lift systems (e.g. Honda VTEC) the ECU detects that the bank 1 rocker arm actuator is stuck in the engaged (high lift) position. Idle quality and fuel economy are affected.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Insufficient oil pressure / level
highOne of the most commonly reported causes for this code — check this first.
Stuck VVL solenoid
mediumA plausible cause — test and verify before replacing parts.
Carbon or debris buildup preventing free movement
lowLess common, but worth ruling out after the more likely causes.
Related help
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