What causes a SPN 7749 code?

SPN 7749 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 7749 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 7749 active.

How do I fix SPN 7749?

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 7749

Cummins fault code 7749

What it means

Power Cylinder 1 Solenoid Driver Circuit - Current Below Normal or Open Circuit. This indicates the ECM has detected an interruption in the electrical current to the injector/solenoid circuit for cylinder 1.