What causes a SPN 4258 code?

SPN 4258 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 4258 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4258 active.

How do I fix SPN 4258?

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 4258

Injector Amplifier Control Valve Cylinder 4,5,6 Shorted to Ground

What it means

The MCM has detected a short to ground on the high-side or return circuit shared by the injector amplifier control valves for the rear bank (cylinders 4, 5, and 6).