What causes a SPN 523600 code?

SPN 523600 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 523600 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 523600 active.

How do I fix SPN 523600?

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 523600

TCM System Voltage Out of Range

What it means

This code indicates that the Transmission Control Module (TCM) is receiving a voltage supply that is either too high or too low. This can prevent the TCM from operating correctly.