Intake Manifold Tuning Valve Control Circuit/Open Bank 1
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.
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.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
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?+
Can I just clear P0660?+
Related codes
Read & clear P0660 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.