OBD-II Code · Fuel & Air
P2008
IMRC Circuit Open (Bank 1)
Severity
medium
Worth booking. It costs fuel, emissions or comfort until it is fixed.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$100–$500
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
IMRC circuit open.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Likely causes
- WiringMost common
- Failed actuator
Read the full diagnostic procedureP2008 means the ECU has detected an open circuit in the Intake Manifold Runner Control actuator or its wiring on bank 1 — the runner-flap motor, the…
P2008 means the ECU has detected an open circuit in the Intake Manifold Runner Control actuator or its wiring on bank 1 — the runner-flap motor, the solenoid, or the harness between them is not completing the circuit when commanded. IMRC systems (sometimes called SCV, IMT, or charge-motion valves depending on OEM) close flaps in the intake runners at low RPM to increase intake velocity and tumble, then open them at higher RPM for max airflow; the actuator is either a vacuum diaphragm, a stepper motor, or a small DC motor with a position feedback potentiometer.
The cheapest-first ladder
- pull the IMRC connector and check for 12V key-on power and a clean ground (most OEMs power the actuator through a relay and ground through the ECU).
- Then back-probe the actuator winding resistance with the connector unplugged — typical spec is 4-12 ohms for a DC motor or solenoid; infinite resistance means an open winding inside the actuator.
- For stepper-motor IMRC (Ford Cyclone, GM LFX), scan-tool the commanded current and position — current should swing between 0.3 A at hold and 1.2-1.5 A during a full-stroke move; position feedback should report 0-100% smoothly.
- If commanded current is present but position never changes, the mechanical linkage is seized — carbon-locked runner flaps are extremely common on direct-injection engines past 80k miles.
- The expensive-misdiagnosis caveat: don't replace the intake manifold assembly before confirming the actuator winding is actually open — the IMRC actuator on a Ford 3.5 Cyclone is sold separately for around $180, but the full intake manifold assembly is $700-$1,200 and dealers will quote the whole assembly by default.
Vehicle-specific patterns2007-2014 Ford 3.5/3.7 Cyclone (Edge, Explorer, Taurus, Flex, MKX, MKS) is the volume P2008 platform — the IMRC actuator motor is mounted on top of t…
- 2007-2014Ford 3.5/3.7 Cyclone (Edge, Explorer, Taurus, Flex, MKX, MKS) is the volume P2008 platform — the IMRC actuator motor is mounted on top of the intake and cooks from engine heat, with the wiring connector vulnerable to corrosion from a leaking cowl drain.
- 2004-2010Ford 4.6/5.4 Triton (F150, Expedition, Mustang GT) throws P2008 when the IMRC vacuum-actuated flap shafts seize from carbon buildup; smoke-test the vacuum circuit and free the shafts with carb cleaner before replacing the intake.
- 2010-2017GM 3.6 LFX/LLT (Camaro, CTS, Traverse, Acadia) throws P2008 from a known intake-manifold flap shaft wear issue — the plastic flaps shed teeth and lock the actuator.
- 2010-2018Hyundai Theta II 2.4 (Sonata, Tucson, Sportage) throws P2008 from carbon-locked CVVT-related runner valves.
Estimated repair$180 (actuator only) to $1,400 (full intake manifold + labor on the Cyclone).
Look up another code
P2008 — frequently asked
What does a P2008 code mean?
IMRC circuit open.
What causes a P2008 code?
Common causes: Wiring; Failed actuator.
What are the symptoms of a P2008 code?
Typical symptoms: Check engine light.
Is it safe to drive with a P2008 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $100-$500.
How do I diagnose a P2008 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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