P2655 indicates the engine control module (ECM) has detected an open circuit in the rocker arm actuator (variable valve timing solenoid) control circuit for bank 2. The actuator regulates oil flow to the VVT mechanism to adjust valve timing; an open circuit prevents the ECM from commanding the solenoid, disabling variable valve timing on that bank.
The solenoid internal coil may be open, or the plunger may be mechanically stuck, preventing proper operation.
Broken wires, corroded connectors, or chafed harness sections between the ECM and the bank 2 actuator interrupt the control signal.
Loose, corroded, or contaminated terminals create high resistance or an open circuit condition.
Insufficient oil pressure or wrong viscosity can prevent the VVT system from functioning, though this typically sets additional codes.
Internal ECM output driver for the bank 2 actuator may be damaged, but this is uncommon compared to wiring or solenoid faults.
Short trips are possible, but variable valve timing will be disabled on bank 2, reducing performance and fuel economy. Extended driving may cause additional wear.
ECM failure is very rare for this code. The vast majority of cases are due to the actuator itself, wiring, or connectors. Replace the ECM only after all other causes are ruled out.
Low or incorrect oil can impair VVT operation and may contribute, but the code specifically indicates an electrical open circuit. Check oil level first, but do not assume it is the sole cause.
Often they are identical, but verify the part number for the specific engine. Do not assume interchangeability without confirmation.