What causes a P2408 code?

P2408 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 P2408 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P2408 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

P2408

Fuel Cap Sensor Circuit Low Signal

What it means

The P2408 code indicates a fault in the fuel filler cap sensor circuit, which is often used as part of a fleet management or anti-siphoning system to monitor fuel tank access.