Open circuit, high resistance or chafed wiring between the engine control unit and the tuning valve or solenoid; Corroded, loose or pushed-out pins in the valve connector; Faulty tuning valve solenoid or actuator with an open internal coil; Blown fuse or missing power or earth supply to the valve circuit; Damaged vacuum or electrical actuator unit on the intake manifold, where fitted; Fault in the engine control unit output driver; Outdated control unit software that wrongly monitors the circuit, on models where this is a known issue.

P0663

Intake Manifold Tuning Valve Control Circuit/Open Bank 2.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
63: FaultThe specific fault in that area

What it means

P0663 is the SAE J2012 generic code for an open circuit in the intake manifold tuning valve control circuit on Bank 2. The engine control unit commands the valve, which changes the length or flow path of the intake runners, and monitors the control circuit. It set the code because the circuit voltage or current did not match the commanded state, which points to an open circuit. The layout of the valve and the definition of Bank 2 vary by engine.

Symptoms

Engine warning light on
Loss of power in the mid or upper rev range
Flat spot or weak torque at certain engine speeds
Rough or uneven idle
Slightly higher fuel consumption
Change in intake noise at certain revs

Possible causes

Open circuit, high resistance or chafed wiring between the engine control unit and the tuning valve or solenoidlikely
Corroded, loose or pushed-out pins in the valve connectorlikely
Faulty tuning valve solenoid or actuator with an open internal coillikely
Blown fuse or missing power or earth supply to the valve circuitpossible
Damaged vacuum or electrical actuator unit on the intake manifold, where fittedpossible
Fault in the engine control unit output driverrare
Outdated control unit software that wrongly monitors the circuit, on models where this is a known issuerare

How to diagnose

Read all stored and pending codes and note the freeze frame data, such as engine speed, load and temperature, for when the fault set.
Check for other codes, especially for Bank 1 tuning valves, supply voltage or other circuit faults, which may share a power supply or earth.
Identify which bank is Bank 2 and locate the valve on that engine using the manufacturer's information.
Inspect the wiring and connector at the valve for chafing, heat damage, corrosion, water ingress and bent or loose pins.
Check the relevant fuse and the power and earth supplies to the valve circuit with a multimeter.
Measure the solenoid coil resistance and compare it with the specification for that engine.
With the ignition on, command the valve using a scan tool's actuator test, if available, and check it clicks, moves or changes the control signal.
Test the wiring for continuity and for shorts to earth or supply between the valve connector and the control unit connector.

How to fix

Repair or replace damaged wiring, and secure any loose or corroded connections.
Replace the connector or terminals if the pins are corroded, spread or damaged.
Replace the tuning valve or actuator if its coil is open or it does not respond to commands.
Replace the blown fuse after finding and fixing the cause, or restore the missing power or earth supply.
Update the control unit software only if the manufacturer lists it as a fix for this fault on that model, and replace the control unit only after all other causes are ruled out.

Can I keep driving?

Low severity

The car can normally be driven, but expect reduced performance and possibly higher fuel use. Book it in soon so the fault does not hide other problems.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.