P2008: How to Diagnose & Fix — Intake Manifold Runner Control (IMRC) Circuit/Open (Bank 1)
2 vehicles · 2 makes · $200-$1,500 repair
How to diagnose and fix P2008: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Volkswagen Phaeton · 2009–2016
On the European 3.0 V6 TDI, the intake manifold and its swirl flaps progressively clog with a hard carbon/oil sludge formed from EGR soot mixing with crankcase breather oil mist. The deposits restrict airflow and jam or wear the swirl-flap mechanism and its actuator/position sensor, throwing fault codes and hurting performance and economy. The swirl-flap actuator linkage can also fail mechanically. This is a well-known shared VAG 3.0 TDI weakness discussed extensively on German and UK forums.
Common Symptoms
- Reduced power / limp mode
- Poor fuel economy
- Rough running
- Swirl-flap or intake-runner position fault codes
- Check engine light
How to Fix
Remove and clean or replace the intake manifold and swirl flaps using a repair kit; replace the swirl-flap actuator/position sensor if worn. Service or delete EGR carbon paths per local regulations and consider an oil catch can to slow re-contamination. Keep up with EGR-system maintenance.
Sources for this issue (2)
Mercedes-Benz G-Class · 2005–2018
On diesel G-Class models with the OM642 V6, the plastic intake-manifold swirl flap linkage becomes brittle and snaps, and the swirl-flap actuator motor can fail (often after being contaminated by oil weeping from the turbo inlet seal). The broken plastic rods can also be drawn into the engine in worst cases. This is a well-known weak point that triggers intake-runner control faults, limp mode, and emissions test failures. Particularly relevant to higher-mileage EU diesel examples.
Common Symptoms
- Engine warning light
- Limp mode / reduced power
- Rough or poor idle
- Hesitation on acceleration
- Failed emissions test
How to Fix
Replace the swirl-flap actuator and fit a metal/upgraded swirl-flap repair kit (e.g. updated connecting rod kit) to replace the brittle plastic linkage. Address any upstream turbo oil leak contaminating the motor. A resistor bypass only clears the code and is not a proper repair if the linkage is broken.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- X8R0175 OM642 dual swirl-flap connecting-rod repair kitOEMX8R X8R0175
External linkage-only branch when both OM642 manifold flap shafts and actuator test good Fitment/availability: The inspected manufacturer listing identifies X8R0175 as two aluminum rods with six retaining clips and anti-friction adapters…
- Genuine Mercedes-Benz OM642 swirl-flap actuator A6421500594OEMMercedes-Benz A6421500594
Later G 350 actuator-motor branch after commanded tests prove motor/circuit failure and VIN/stamped number match Fitment/availability: The inspected official German genuine-parts page identifies A6421500594 as an in-stock actuator at €26…
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Sources for this issue (3)
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P2008 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P2008 mean?
P2008 stands for "Intake Manifold Runner Control (IMRC) Circuit/Open (Bank 1)." P2008 is a generic powertrain code indicating the engine control module (ECM) has detected an open or out-of-range electrical fault in the Intake Manifold Runner Control circuit for Bank 1. The IMRC system uses an actuator (solenoid/motor) to open and close runner control flaps in the intake manifold to optimize airflow, torque, and emissions across the RPM range; this code means the control circuit is not responding as commanded.
What are the most common causes of P2008?
The most common causes of P2008 are: Failed or seized intake manifold runner control actuator/solenoid (motor), Open, shorted, corroded, or chafed wiring in the IMRC control circuit, Loose or corroded electrical connector at the IMRC actuator, Stuck, broken, or carbon-fouled intake manifold runner flaps or linkage, Blown fuse or loss of power/ground to the IMRC actuator, Faulty ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P2008?
Repair costs for P2008 range from $200 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by P2008?
Au7o has documented P2008 across 2 vehicle models from 2 manufacturers: Mercedes-Benz, Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.