What causes a P218F code?

P218F 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 P218F code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P218F 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.

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OBD-II

P218F

Reductant System No Flow Detected

What it means

The SCR system detects that DEF fluid is not flowing despite the pump running and the injector being commanded open.

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