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P2004 Fuel & Air Metering
Intake Manifold Runner Control Stuck Open Bank 1
P2004 means the intake manifold runner control (IMRC) for Bank 1 is stuck in the open position. The ECM commands the runner flaps to close at low RPM for better torque, and it has detected they are not moving as expected. Common causes are a stuck runner, a failed actuator, or carbon buildup.
🚗 Yes, but expect rough low-speed performance and possible poor fuel economy until it is fixed.
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🎯 Top Causes, Ranked by Likelihood
#1 Carbon buildup jamming the runner flaps $50-$300
Deposits inside the intake manifold keep the runners from moving to the closed position.
#2 Failed IMRC actuator or solenoid $100-$400
The electric or vacuum actuator that drives the runners has failed.
#3 Broken or disconnected linkage $50-$300
The mechanical link between the actuator and the flaps is broken or unhooked.
#4 Wiring or connector fault to the actuator $50-$200
Open or shorted control circuit prevents proper operation.
🩺 Common Symptoms Check engine light on Reduced low-end power or hesitation Possible drop in fuel economy Rough or uneven idle in some vehicles 💰 Repair Cost: DIY vs Shop
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🔧 How to Diagnose P2004 1 Scan for related IMRC codes and check freeze frame data
2 Inspect the runner actuator and linkage for movement and damage
3 Remove the intake and check for carbon buildup on the flaps
4 Test the actuator command and wiring with a scan tool
❓ Frequently Asked Questions Can I drive with a P2004 code?
Yes for short trips, but you may notice weak low-speed power. Fix it soon to restore performance and pass emissions testing.
How much does it cost to fix P2004?
Cleaning carbon can be cheap, but a new intake manifold or actuator can run $150 to $650 or more at a shop.
What is the most common cause of P2004?
Carbon buildup jamming the runner flaps open is the most common cause, followed by a failed IMRC actuator.
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