What causes a P2008 code?

P2008 can be triggered by several issues — see the verified probable causes and step-by-step diagnostics shared by mechanics and owners on OBDIY.

Can I drive with a P2008 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2008 active.

Follow the step-by-step diagnostic on this page, then read the verified fixes contributed by other Heavy Truck owners — the answer marked "Verified Cause" worked for the original poster.

OBDIY

OBD-II

P2008

Intake Manifold Runner Control Circuit Open

What it means

The Engine Control Module (ECM) detects an open circuit or faulty electrical signal in the Intake Manifold Runner Control (IMRC) actuator or solenoid circuit. This system modulates intake air tumble and swirl to optimize combustion efficiency at varying engine speeds.