What Does P2004 Mean?
The intake manifold runner control valve for Bank 1 is stuck in the open position. This prevents the PCM from properly controlling airflow optimization for different engine speeds and loads.
Common Causes
35%
Carbon buildup on runner control valve causing mechanical binding
30%
Failed runner control actuator motor or solenoid
20%
Broken or disconnected linkage or vacuum lines
10%
Faulty position sensor on runner control valve
5%
PCM software issue or wiring harness damage
Diagnostic Steps
1
Step 1: Visually inspect intake manifold runner control valve for carbon deposits, physical damage, or binding
2
Step 2: Test IMRC actuator operation using bi-directional scan tool controls while observing valve movement
3
Step 3: Check vacuum supply to actuator (if vacuum-operated) and inspect all vacuum lines for leaks or disconnections
4
Step 4: Measure resistance and continuity of IMRC position sensor and compare to specifications
5
Step 5: Inspect wiring harness and connector for corrosion, damage, or loose pins
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The intake manifold runner control valve for Bank 1 is stuck in the open position. This prevents the PCM from properly controlling airflow optimization for different engine speeds and loads.
The most common cause of P2004 (Intake Manifold Runner Control Stuck Open Bank 1) is: Carbon buildup on runner control valve causing mechanical binding
Typical repair costs for P2004 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced power, poor fuel economy, and rough idle. Performance will be noticeably affected under acceleration.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2004 to identify the root cause.
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Quick Info
Category
Powertrain
System
Air Intake System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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