What causes a P2427 code?

P2427 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 P2427 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2427 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

P2427

Exhaust Gas Recirculation (EGR) Cooling Control Circuit Low

What it means

The Engine Control Module (ECM) detected a voltage signal from the EGR cooler bypass valve control circuit that is below a predetermined threshold. This indicates a potential short to ground or an open circuit in the bypass valve actuator.