What causes a P0744 code?

P0744 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 P0744 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0744 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

P0744

Intermittent Torque Converter Clutch (TCC) Circuit Failure

What it means

The Transmission Control Module (TCM) has detected an inconsistent or erratic signal from the torque converter clutch solenoid circuit, indicating failure to maintain lock-up.