Code result
P2004
Intake Manifold Runner Control Stuck Open
Moderate severity
What it means
The intake manifold runner control (IMRC) flap on bank 1 is stuck in the open position. The IMRC swirls or tumbles intake charge at low rpm by closing one runner per cylinder; when stuck open, low-end torque drops and the engine may misfire on cold starts.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Carbon buildup blocks flap travel
highOne of the most commonly reported causes for this code — check this first.
IMRC actuator or vacuum motor failed
mediumA plausible cause — test and verify before replacing parts.
Linkage rod broken or disconnected
mediumA plausible cause — test and verify before replacing parts.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P2004 freeNo credit card required