What causes a SPN 4705 code?

SPN 4705 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 4705 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4705 active.

How do I fix SPN 4705?

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 4705

Allison transmission code P4705

What it means

Shift Solenoid E Control Circuit Range/Performance. This indicates the TCM has detected an electrical malfunction or performance issue with the solenoid responsible for managing specific gear transitions (typically E-solenoid).