P2008

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 patterns: 2007-2014 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 the intake and cooks from engine heat, with the wiring connector vulnerable to corrosion from a leaking cowl drain. 2004-2010 Ford 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. 2010-2017 GM 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. 2010-2018 Hyundai 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).