P2004 - Intake Manifold Runner Control Stuck Open (Bank 1)
System
Powertrain (Engine & Gearbox)
Technical Description
The control module has detected a fault in the Intake Manifold Runner Control Stuck Open (Bank 1) (P2004). Affects cylinder bank 1 (bank 1 containing cylinder 1, firewall/right side).
Multimeter Test Points & Nominal Values
| Test Point / Component | Measurement | Nominal Target Range | Test Condition |
|---|---|---|---|
| Intake Manifold Runner Control Stuck Open (Bank 1) – Signal Voltage | Voltage (V) | 0.50 - 4.50 V (tracks operating range) | Ignition ON, connector engaged |
| 5 V Reference Voltage | Voltage (V) | 4.95 - 5.05 V | Ignition ON at sensor connector |
| Sensor Ground Voltage Drop | Voltage (V) | < 0.05 V (< 50 mV) | Under load to chassis ground |
| Signal Wire Continuity | Resistance (Ω) | < 0.5 Ω (Open = OL) | Disconnected harness between sensor and ECM |
Ignition ON, connector engaged
Ignition ON at sensor connector
Under load to chassis ground
Disconnected harness between sensor and ECM
Oscilloscope Waveform Analysis
100 ms/div, 1 V/divPossible Causes
Mechanical sticking or debris/carbon contamination jamming Intake Manifold Runner Control Stuck Open (Bank 1)
Bank 1 specific:Inspect wiring harness to cylinder bank 1 (firewall/right bank, exposed to exhaust manifold heat).
Chafed or pinched wiring harness along the signal path to Intake Manifold Runner Control Stuck Open (Bank 1)
Poor ground connection or excessive voltage drop (> 0.1 V) at the ground point for Intake Manifold Runner Control Stuck Open (Bank 1)
Defective internal output driver or reference circuit in the control module for Intake Manifold Runner Control Stuck Open (Bank 1)
Symptoms
4
Recommended Solution
Cross-swap the component on Bank 1 with Bank 2 to rule out mechanical oil passages and internal timing wear.
Remove component and inspect for carbon deposits or foreign debris preventing full mechanical closure.
Verify loaded supply voltage and harness terminal pins at Intake Manifold Runner Control Stuck Open (Bank 1).
Check circuit continuity and ground-side voltage drop (< 0.05 V) for Intake Manifold Runner Control Stuck Open (Bank 1).
Unplug the sensor:the signal must swing to a known rail. Replace the sensor or repair the wiring based on the result.
Mechanic's Tip
Always run a loaded voltage-drop test on the sensor ground with ignition ON. A drop above 0.1 V shifts the whole signal and tricks the module into setting sensor codes on a good sensor.