The powertrain control module has detected an open circuit in the electrical path that controls the intake manifold tuning valve on Bank 2, preventing runner-length adjustment. This condition is usually caused by a failed actuator solenoid, wiring break, or connector issue rather than a computer fault. Drivers may notice reduced mid-range torque and a persistent check engine light until the circuit is restored.
The solenoid or actuator motor that moves the Bank 2 tuning valve has an internal open winding, so current cannot flow through the control circuit.
A break, chafing, or severed wire in the harness between the PCM and the valve interrupts continuity and triggers the open-circuit code.
Corrosion, moisture intrusion, or backed-out pins in the connector at the valve or the PCM harness create enough resistance to appear as an open circuit.
Although uncommon, the PCM output driver that supplies or controls current to the tuning valve may fail, though this should only be considered after the valve and wiring are verified good.
Yes, short-term driving is generally safe, though engine performance may be reduced and fuel economy can suffer slightly until the circuit is repaired.
Usually no. The code indicates an electrical fault in the tuning valve control circuit. The manifold itself is only necessary if the internal mechanical runner or shaft is physically damaged and cannot be serviced separately.
No. A failed PCM driver is one of the least likely causes for P0663. Most cases are fixed by replacing the faulty solenoid or repairing wiring and connectors. The PCM should only be suspected after all other components have been thoroughly tested.
Bank 2 refers to the side of the engine opposite cylinder number one in V-configured or horizontally opposed engines. This code applies specifically to the intake manifold tuning valve circuit on that bank.