What causes a SPN 3263 code?

SPN 3263 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 3263 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 3263 active.

How do I fix SPN 3263?

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 3263

Engine Exhaust Gas Mass Flow Rate Data Erratic

What it means

The Engine Control Module (ECM) has detected that the exhaust gas mass flow rate signal is intermittent, erratic, or out of range. This value is typically a calculated parameter based on EGR, Delta P, and intake manifold pressure sensors.