P2004

Code

AUDI P — Powertrain

A failed IMRC actuator, A problem with the intake manifold or linkage, Wiring issues

Brand: AUDI

Type: P — Powertrain

Views: UK: 32 EN: 79 RU: 105

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Page language: EN

Causes

Failed or seized IMRC actuator/motor
Intake manifold runner linkage binding or broken linkage
Carbon buildup or debris preventing runner movement
Damaged wiring or poor connector connection to the IMRC actuator
Faulty IMRC position sensor or internal actuator sensor
ECU output driver fault (less common)

Symptoms

Check Engine Light (MIL) illuminated with P2004 stored
Reduced low-end torque or rough idling under certain loads
Hesitation or stumble on acceleration, especially at low RPM
Poor fuel economy or increased emissions
Audible binding or clicking from intake manifold area on actuation (in some cases)

What to check

Read and record freeze-frame data and all stored codes; note related codes
Perform visual inspection of intake manifold, actuator and harness for damage, loose connectors, corrosion or broken parts
Use scan tool to actuate IMRC system in bi-directional test and observe movement
Check for obvious carbon/soot accumulation on runners and flaps
Back-probe actuator connector while commanding actuator to move; verify supply and switch signals
Measure actuator resistance and compare to manufacturer specification

Signal parameters

Actuator supply voltage: ~12 V (ignition on; while commanded, may pulse)
Position sensor/feedback voltage: normally ~0.5–4.5 V depending on flap angle (varies by design)
Control signal: PWM duty cycle or on/off command from ECU when actuated
Actuator coil resistance: manufacturer-specific (commonly low ohms — check spec)
Actuation time: runner should move smoothly; full travel typically within ~0.5–2 seconds

Diagnostic algorithm

Connect OBD-II scanner, read codes and freeze frame; check for related DTCs (bank 1/2, position sensor codes).
Visually inspect IMRC actuator, harness and connector for damage, corrosion or disconnected wiring.
With scanner, command IMRC open/close and observe movement. Note if actuator moves, stalls, or is stuck.
If no movement, back-probe connector while commanding actuator: verify battery voltage at supply pin and switching/ground or PWM at control pin.
Measure actuator coil resistance with multimeter; compare to spec. Excessively high/low or open indicates internal failure.
If actuator gets correct signals but does not move, remove actuator and inspect linkage and flaps for carbon build-up, seized bearings or broken parts. Clean or repair as needed.
If actuator does not receive correct control signal, trace wiring to ECU looking for shorts, opens or corrosion; repair as needed.
If wiring and actuator are good but ECU output is missing, consider ECU driver fault and perform further ECU diagnostics.
After repair or replacement, clear codes and perform actuation tests and a road verification; confirm codes do not return.

Likely causes

IMRC actuator electrical failure (motor or internal encoder)
Runner shaft or flaps seized by carbon deposits
Frayed/chafed wiring or corroded connector at actuator
Broken linkage or loose fasteners allowing incorrect position
Connector not fully seated after previous work

Fault status

⚠️ Status

P2004 — Intake Manifold Runner Control (IMRC) stuck open / IMRC actuator or linkage fault on Bank 1. Check actuator, linkage, wiring, and intake manifold for faults.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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Repair manuals

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