What causes a SPN 3488 code?

SPN 3488 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 SPN 3488 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3488 active.

How do I fix SPN 3488?

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

J1939 SPN

SPN 3488

SPN 3488 - Aftertreatment 1 Hydrocarbon Doser Solenoid Current Below Normal

What it means

This code indicates an electrical circuit fault where the Engine Control Module (ECM) detects low current or an open circuit in the aftertreatment fuel injector (hydrocarbon doser) solenoid circuit.