P0662 — Intake Manifold Runner Control Circuit High (Bank 1)
Moderate severityWhat it means
P0662 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. A “high” reading means the signal is pinned near the top of its range — often an open circuit, a lost ground, or a short to voltage.
Common symptoms
- The live reading sits abnormally high or maxed out
- Loss of low-end torque or top-end power
- Rough idle or hesitation
- Check engine light
Likely causes
- Open signal or ground wire
- Signal wire shorted to a voltage supply
- A stuck runner flap or carbon buildup
- A failed runner-control actuator or a wiring fault
What to check first
- Check for an open circuit or missing ground at the sensor connector
- 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 P0662?
The most likely cause is: Open signal or ground wire. Several other faults can set P0662 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0662 and keep driving?
Clearing P0662 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 P0662?
P0662 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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