What causes a P0900 code?

P0900 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 P0900 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0900 active.

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

OBD-II

P0900

Clutch Actuator Circuit Open

What it means

This code indicates an open circuit in the electrical wiring or within the clutch actuator itself. The TCM is not able to communicate with or control the clutch actuator due to a break in the circuit.