What causes a P0612 code?

P0612 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 P0612 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0612 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

P0612

P0612 Fuel Injector Control Module Relay Control Circuit

What it means

This code indicates a malfunction in the control circuit for the Fuel Injector Control Module (FICM) relay, usually involving a power supply or internal processor error in the engine management system.