Intake Manifold Runner Control Circuit High (Bank 2)
Common Symptoms
- Check Engine light illuminated
- Rough idle or engine stumble
- Poor acceleration or reduced power
- Decreased fuel economy
- Engine hesitation during light throttle
- Unusual intake manifold noise or hissing
Most Likely Root Causes
- Faulty intake manifold runner control solenoid or actuator
- Damaged or corroded wiring to runner control valve
- Stuck or binding intake manifold runner flaps
- Failed intake manifold runner control motor
- Engine control module commanding issue
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Component Location
The intake manifold runner control valve or actuator is mounted on or within the intake manifold assembly on the engine's Bank 2 cylinder head side.
Manufacturer Notes
Some manufacturers use vacuum-operated runner controls while others use electric motors, requiring different diagnostic approaches for this circuit fault.
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