Error code
OBD2 P2661
OBD2P2661
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
'B' Rocker Arm Actuator System Performance or Stuck Off.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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