What causes a SPN 7588 code?

SPN 7588 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 7588 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 7588 active.

How do I fix SPN 7588?

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 7588

Cummins fault code 7588

What it means

Aftertreatment 1 SCR Catalyst System - Out of Calibration. The engine control module (ECM) has detected that the SCR catalyst efficiency is below a predetermined threshold.