What causes a SPN 4702 code?

SPN 4702 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 4702 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 4702 active.

How do I fix SPN 4702?

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 4702

Allison transmission code P4702

What it means

Transmission Clutch Control Solenoid E Control Circuit - High Current or Short to Ground (Specific to Allison 4th/5th Gen controllers).