What causes a P0660 code?

P0660 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P0660 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0660 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P0660

P0660 Intake Manifold Tuning Valve Control Circuit Open

What it means

The Engine Control Module (ECM) detects an open circuit or a break in the wiring for the intake manifold runner control (IMRC) solenoid or motor, preventing proper adjustment of the intake air path.