What causes a SPN 5684 code?

SPN 5684 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 5684 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 5684 active.

How do I fix SPN 5684?

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 5684

Cummins fault code 5684

What it means

Aftertreatment 1 Particulate Matter Sensor Heater Control - Voltage Below Normal or Shorted to Low Source. This code indicates the ECM detected that the PM sensor heater circuit is not drawing enough current or is open.