What causes a SPN 2806 code?

SPN 2806 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 2806 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 2806 active.

How do I fix SPN 2806?

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 2806

SPN 2806 Transmission Control Unit Torque Limit Status

What it means

This fault indicates a communication mismatch or data error regarding torque limits requested by the Transmission Control Unit (TCU) to the Engine Control Module (ECM) via the J1939 data link.