P0660 — Intake Manifold Runner Control Circuit/Open (Bank 1)
Moderate severityWhat it means
P0660 is stored when the engine control unit sees a fault involving the intake manifold runner control on bank 1. Intake manifold runner control opens and closes flaps in the intake to tune airflow for low- and high-RPM power; this code flags a fault in that control circuit on bank 1. The “open” status means the control circuit is electrically broken — usually a cut wire, an unplugged connector or a failed driver.
Common symptoms
- The component does not respond to commands
- Loss of low-end torque or top-end power
- Rough idle or hesitation
- Check engine light
Likely causes
- Open or broken wire in the control circuit
- Unplugged or corroded connector
- A stuck runner flap or carbon buildup
- A failed runner-control actuator or a wiring fault
What to check first
- Check circuit continuity and connector pins with the key off
- Watch the runner control operate with a scan tool
- Inspect the flaps, linkage and actuator connector
Can you keep driving?
Usually drivable, but power delivery suffers; diagnose soon, especially if a flap is stuck.
Frequently asked questions
What is the most common cause of P0660?
The most likely cause is: Open or broken wire in the control circuit. Several other faults can set P0660 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0660 and keep driving?
Clearing P0660 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P0660?
P0660 is a moderate-severity code. The car is often still drivable, but have it diagnosed soon — the underlying problem can get worse and it may fail an emissions test.
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