What causes a SPN 702 code?

SPN 702 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 702 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 702 active.

How do I fix SPN 702?

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 702

J1939 SPN 702 — Engine Management parameter

What it means

SPN 702 refers to the Transmission Gear Position/Selection signal. The ECM is receiving invalid data or is unable to verify the current gear position of the transmission.