What causes a SPN 520973 code?

SPN 520973 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 520973 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with SPN 520973 active.

How do I fix SPN 520973?

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 520973

Clutch 1 Position Sensor

What it means

This code indicates an issue with Clutch 1 position sensor, suggesting an implausible signal or out-of-range value. The likely root cause is a faulty sensor or wiring.