P2008 on Mercedes-Benz: How to Diagnose & Fix
Intake Manifold Runner Control (IMRC) Circuit/Open (Bank 1)
1 Mercedes-Benz model · 1 documented issue · $200-$900 repair
P2008 on Mercedes-Benz by model: symptoms, diagnosis and fix
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)
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 on a Mercedes-Benz?
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. On Mercedes-Benz it is documented across 1 model: G-Class.
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 on a Mercedes-Benz?
Published repair estimates on Mercedes-Benz range from $200 to $900 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P2008 on a different make?
View P2008 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.