P2004 — Intake Manifold Runner Control Stuck Open (Bank 1)
Category: Powertrain Severity: Low
Updated:
DTC code P2004 means: Intake Manifold Runner Control Stuck Open (Bank 1). It falls under the "Powertrain" category, with an estimated severity of Low. Common causes include intake (swirl) flaps seized with carbon, failed flap actuator and split vacuum hose; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Intake (swirl) flaps seized with carbon
- Failed flap actuator
- Split vacuum hose
- Loose or broken linkage
Symptoms
- Check engine light
- Slight low-rpm torque loss
- Slightly rough idle
How to diagnose it step by step
- Check the vacuum hose or electric actuator.
- Move the linkage by hand.
- Command the actuator with a scan tool.
- Clean or replace the manifold.
How to fix it
Check that the actuator moves the flaps. On diesels (BMW, Mercedes, Fiat, Opel) carbon locks them up: clean or replace the manifold.
Estimated repair cost
Actuator: $100–300. Intake manifold: $300–900.
Frequently asked questions
What does DTC code P2004 mean?
Intake Manifold Runner Control Stuck Open (Bank 1).
Is code P2004 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P2004?
Yes, you can drive; make sure no flap can come loose into the engine.
Related codes
P2002 P2096 P2097 P2098 P2099 P20EE
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