P0660 Intake Manifold Tuning Valve Control Circuit/Open (Bank 1)

P0660 indicates an open or general fault in the intake manifold tuning valve control circuit on Bank 1. The controller cannot command or monitor that runner or tuning valve path correctly.

Code details

Generic OBD-II · P0

System: Computer
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the intake manifold before checking Bank 1 actuator power, ground, linkage, and command response.

Symptoms of P0660

Check-engine light, sometimes with several unrelated codes at once.
Warning lights, a no-start, or intermittent electrical faults.
Communication or module-reset problems on a scan tool.

Common causes of P0660

Low battery voltage, poor grounds, corroded connectors, or blown fuses.
Wiring or network (CAN bus) faults between modules.
A module software/programming issue, or rarely a failed controller.

Useful checks before replacing parts

Check tuning valve command, position feedback where available, intake airflow, manifold pressure response, freeze-frame RPM and load, and related runner codes.
Inspect Bank 1 actuator wiring, connector terminals, vacuum supply where used, linkage binding, carbon buildup, relay or solenoid control, and grounds.
Command the valve and verify both electrical response and actual manifold tuning movement.

Related OBD-II codes

These nearby computer entries can help compare wording and pin down the fault area.