Fuel and air

P0660 — Intake Manifold Tuning Valve Control Circuit (Bank 1)

Severity: low Safe to drive

What P0660 means

The engine control module operates an intake manifold tuning valve that changes the intake runner length or airflow path depending on engine speed. This helps the engine make good torque at low rpm and power at high rpm. P0660 sets when the voltage or current in the valve's control circuit does not match what the module expects. The cause can be electrical or the actuator itself.

Symptoms

  • Check Engine light on
  • Loss of low-rpm torque
  • Reduced power at high rpm
  • Rough idle
  • Worse fuel economy

Possible causes

  1. Failed intake tuning valve actuator
  2. Open, shorted or corroded wiring or connector
  3. Faulty intake manifold air control solenoid
  4. Vacuum leak or lost vacuum to the actuator
  5. Carbon buildup or a stuck valve or flaps
  6. Internal driver fault in the ECM (rare)

How to diagnose

  1. Scan all codes and freeze frame data, clear the code and see if it returns.
  2. Inspect the valve connector and harness for chafing, corrosion or heat damage.
  3. Check power and ground at the valve connector with a multimeter, following the wiring diagram for your engine.
  4. Measure the solenoid or actuator coil resistance and compare it to the factory spec.
  5. On vacuum-operated systems, test hoses, check valve and vacuum reservoir for leaks.
  6. Command the valve with a scan tool and confirm the flaps move freely.
  7. Remove and inspect the flaps for carbon buildup and shaft play.
  8. Test the wire from the ECM to the valve for opens and shorts.

Common fixes

  • Repair damaged wiring or the connector
  • Replace the solenoid or tuning valve actuator
  • Replace cracked vacuum lines
  • Clean carbon from the flaps and manifold
  • Replace the manifold if the flap shafts are worn
  • Update the ECM software if the manufacturer offers it

P0660 on different brands

Ford · manuals
On 2024-2025 Ford gasoline engines, the extended code P0660:01 indicates an IMTV output electrical check; it identifies the monitor condition that tripped, not a confirmed failed part.

Questions and answers

Can I drive with a P0660 code?

Usually yes, since it won't harm the engine. You may get weaker torque and worse fuel economy, so have it checked soon.

What most often causes P0660?

Wiring or connector problems, a bad solenoid or actuator, and carbon-clogged or stuck manifold flaps are the most common causes.

How do I clear P0660?

Fix the underlying problem first, then clear the code with a scan tool. If the fault remains, the code will come back.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.