Broken or disconnected vacuum hose between the intake manifold and the runner control actuator; Failed intake manifold runner control solenoid or actuator; Corroded or damaged electrical connector at the runner control solenoid; Open or shorted wire in the runner control circuit (power, ground, or signal); Failed intake manifold runner control valve or flap mechanism stuck due to carbon buildup; Faulty powertrain control module (rare, but possible if all other components test good)

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P2008

P2008Intake Manifold Runner Control Circuit/Open (Bank 1)

Q: What does code P2008 mean?

Intake Manifold Runner Control Circuit/Open (Bank 1). P2008 indicates that the powertrain control module has detected an open circuit or excessive resistance in the intake manifold runner control circuit for bank 1. The intake manifold runner control system uses a vacuum actuator or electric motor to move a flap inside the intake manifold, altering runner length to optimize airflow at different engine speeds. When the circuit is open, the computer cannot command the runner to change position, which may reduce low-end torque or fuel efficiency.

P2008 indicates that the powertrain control module has detected an open circuit or excessive resistance in the intake manifold runner control circuit for bank 1. The intake manifold runner control system uses a vacuum actuator or electric motor to move a flap inside the intake manifold, altering runner length to optimize airflow at different engine speeds. When the circuit is open, the computer cannot command the runner to change position, which may reduce low-end torque or fuel efficiency.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine power or sluggish acceleration, especially at lower engine speeds
Rough idle or hesitation during light throttle application
Decreased fuel economy due to inefficient intake tuning
In some vehicles, a noticeable lack of torque below 3,000 RPM

Common causes, most likely first

Broken or disconnected vacuum hose between the intake manifold and the runner control actuator
Failed intake manifold runner control solenoid or actuator
Corroded or damaged electrical connector at the runner control solenoid
Open or shorted wire in the runner control circuit (power, ground, or signal)
Failed intake manifold runner control valve or flap mechanism stuck due to carbon buildup
Faulty powertrain control module (rare, but possible if all other components test good)

How to diagnose and fix it

Inspect all vacuum hoses and connections at the intake manifold runner control actuator for cracks, leaks, or disconnection
Check the electrical connector at the runner control solenoid for corrosion, loose pins, or damage; clean and reseat as needed
Test the runner control solenoid with a multimeter for correct resistance and verify it receives power and ground when commanded
Apply vacuum directly to the actuator to confirm the flap moves freely and does not stick
Check the wiring harness for continuity and shorts between the solenoid and the powertrain control module
Replace the faulty runner control solenoid, actuator, or vacuum hose as needed
Clear the diagnostic trouble code and perform a road test to verify the repair and ensure the monitor runs to completion

Before replacing the intake runner solenoid

A simple vacuum leak from a cracked hose often mimics a failed solenoid, so always inspect hoses before condemning electrical parts.
Carbon buildup on the intake runner flaps can cause them to stick, setting a circuit code even when the solenoid and wiring are good.
Some vehicles use a single runner control solenoid for both banks; a fault on bank 1 may be caused by a shared component that also affects bank 2.
The code can be set intermittently by a loose connector that only loses contact during engine vibration, so wiggle-test the harness while monitoring live data.
Do not overlook the possibility of a faulty powertrain control module driver, but only after all other circuit tests pass.

Can I keep driving with P2008?

You can usually continue driving with P2008, but expect reduced performance and fuel economy; avoid heavy acceleration or towing until the fault is repaired, and address it promptly to prevent secondary issues.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.