P0660
Intake Manifold Tuning Valve Control Circuit/Open Bank 1
Intake manifold tuning
Generic OBD-II
Medium
What it means
P0660 means the control circuit for the intake-manifold tuning (runner) valve on bank 1 is open — the valve that changes the intake runner length or path to optimize airflow across the rev range. With it stuck or uncommanded, the engine still runs but can lose some low- or high-rpm power and idle less smoothly.
Medium
Can I keep driving? Usually driveable — the engine runs, but you may notice reduced power or a rough idle in part of the rev range and slightly worse economy; get it fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power in part of the rev range
- Rough idle or an occasional stumble
- Slightly reduced fuel economy
Common causes
Most likely first
- Open circuit or bad connector at the intake-manifold tuning valve/solenoidLikely
- Damaged wiring in the control circuitCommon
- Failed tuning valve or actuatorCommon
- Failed ECM driver (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and compare the valve's commanded vs. actual state.
- Inspect the tuning-valve connector and wiring for opens.
- Measure the valve/solenoid resistance against spec.
- Replace the intake-manifold tuning valve if it's open or seized.
- Repair wiring; replace the ECM only if its driver has failed.
FAQ
Quick answers
Is it safe to drive with P0660?+
Generally yes — the engine runs, but performance and fuel economy may suffer in part of the rev range until it's fixed.
Can I just clear P0660?+
It returns until the open circuit or the tuning valve itself is repaired.
Related codes
Often seen with P0660
Read & clear P0660 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX