P0661
Intake Manifold Tuning Valve Control Circuit Low Bank 1
Intake manifold tuning (air)
Generic OBD-II
High
What it means
P0661 indicates the intake manifold tuning valve control circuit for bank 1 is reading low, typically a short to ground or a failed valve solenoid. The valve adjusts intake airflow for better torque, so you may notice reduced power at certain engine speeds and a check-engine light, though the engine still runs and starts.
High
Can I keep driving? Usually drivable — the engine still starts and runs, but you may notice reduced power or torque at certain engine speeds until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power or torque, often noticeable at certain RPM
- Rough idle
- Slightly reduced fuel economy
Common causes
Most likely first
- Short to ground in the intake manifold tuning valve control circuitLikely
- Failed intake manifold tuning valve / solenoidCommon
- Damaged or corroded wiring or connectorsCommon
- Faulty engine control module (ECM)Less often
How to diagnose & fix
Work through it in order
- Inspect the tuning valve connector and wiring for a short to ground or corrosion.
- Measure the valve solenoid resistance against spec and confirm it's not internally shorted.
- Replace the intake manifold tuning valve if the solenoid is out of range.
- If the valve and wiring are good, check the ECM control driver. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0661?+
Generally yes — the engine starts and runs. You may feel a dip in power at some engine speeds, but it isn't an immediate breakdown risk. Fix it to restore full performance.
Can I just clear P0661?+
It returns until the circuit short or failed valve is repaired, and you'll keep losing the intake tuning benefit until then.
Related codes
Often seen with P0661
Read & clear P0661 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