What causes a SPN 4263 code?

SPN 4263 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 4263 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4263 active.

How do I fix SPN 4263?

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 4263

Cummins fault code 4263

What it means

Aftertreatment 1 SCR Temperature Sensor Module - Abnormal Update Rate. This indicates the Aftertreatment Control Module (ACM) or ECM has lost communication with the SCR temperature sensor rail over the J1939 data link.