P2008
Intake Manifold Runner Control Circuit/Open Bank 1P2008 is a generic OBD-II powertrain diagnostic trouble code: Intake Manifold Runner Control Circuit/Open Bank 1. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P2008 means
P2008 is set when the Engine Control Module (ECM) detects an open circuit in the Intake Manifold Runner Control (IMRC) drive circuit for Bank 1. The IMRC system uses vacuum solenoids or electric actuators to switch intake runner flap geometry between long runners (low RPM, high torque) and short runners (high RPM, peak power). An open circuit means current cannot flow through the actuator control path, so the ECM cannot command the flaps to move.
An open fault typically results from a broken wire, corroded connector pin, or a failed actuator winding that has gone internally open. Because the ECM monitors the current drawn by the actuator and sees zero draw instead of the expected solenoid pull-in current, it immediately sets P2008 and illuminates the MIL. The IMRC flaps will default to whatever mechanical position they were in when power was lost, usually fully open or fully closed depending on spring bias.
This code is common on VW/Audi 2.0 TFSI engines, Ford Triton V8 trucks, and several Mercedes V6/V8 platforms. It rarely causes limp mode by itself but the engine will lose the torque or power advantage that runner switching provides, and fuel economy may worsen slightly.
Common causes
Most-frequently reported root causes when P2008 is logged.
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1
Broken or chafed wire in the IMRC actuator control circuit creating an open between the ECM and actuator.
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2
Corroded or backed-out terminal pins at the IMRC solenoid or actuator connector.
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3
Failed IMRC vacuum solenoid with an open internal winding (check resistance: typically 20–40 Ω).
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4
Failed IMRC electric motor/actuator with an open armature winding.
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5
Blown inline fuse or failed relay supplying power to the IMRC circuit.
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6
Damaged ECM output driver (rare, rule out wiring first).
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7
Broken PCM-side wiring harness routing near the intake manifold due to heat cycling.
Symptoms drivers notice
How to diagnose P2008
A typical diagnostic flow when this code is present.
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1
Scan with an OBD-II tool, record freeze frame data, and note any companion codes (P2009, P2014, etc.).
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2
Visually inspect the IMRC actuator wiring harness along its full length for chafing, heat damage, or broken wires.
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3
Inspect the actuator connector for corrosion, bent terminals, and secure engagement.
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4
With the connector unplugged, measure actuator solenoid resistance with a multimeter — an open reading (OL) confirms a failed actuator winding.
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5
With the connector plugged in and ignition on, back-probe the control wire and verify the ECM supplies the expected activation voltage when commanded via a bi-directional scan tool.
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6
Repair any open wiring, then recheck resistance and re-scan to confirm the fault is resolved before clearing codes.
Related powertrain codes
- P2000 — NOx Adsorber Efficiency Below Threshold Bank 1
- P2001 — NOx Adsorber Efficiency Below Threshold Bank 2
- P2002 — Diesel Particulate Filter Efficiency Below Threshold Bank 1
- P2003 — Diesel Particulate Filter Efficiency Below Threshold Bank 2
- P2004 — Intake Manifold Runner Control Stuck Open Bank 1
- P2005 — Intake Manifold Runner Control Stuck Open Bank 2
Frequently asked questions
Can I drive with a P2008 code?
Yes, the vehicle is generally safe to drive short-term. The IMRC flaps will be stuck in one position, degrading either low-RPM torque or high-RPM power, but the engine will not be damaged by continued driving. Have the fault repaired promptly to restore performance and avoid related codes developing.
What is the difference between P2008 (open) and P2009 (low)?
P2008 means the circuit is broken — no current path exists at all (infinite resistance). P2009 means the circuit voltage is lower than expected, which usually indicates a short to ground. Both disable the IMRC actuator but have different root causes and require different repair approaches.
How do I test the IMRC solenoid at home?
Unplug the actuator connector and measure resistance across the solenoid terminals with a multimeter. A healthy solenoid typically reads 20–40 Ω (consult the model-specific service manual). An open-loop (OL) reading confirms the solenoid winding has failed and the unit should be replaced.
Will P2008 cause a failed emissions test?
Yes. Any stored fault code that illuminates the MIL will cause an OBD emissions readiness failure in jurisdictions that test via OBD-II. The code must be resolved and the MIL off (with drive-cycle readiness monitors set) before the vehicle will pass.
Disabling P2008 in software
RaceTune can permanently disable P2008 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
ECUs with a P2008 disable in our catalogue
Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.
- Bosch MD1CS001 verified 1 software version
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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