What causes a P0764 code?

P0764 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 P0764 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0764 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

P0764

Shift Solenoid S Intermittent Circuit Fault

What it means

The Transmission Control Module (TCM) has detected an intermittent electrical signal or communication failure with Shift Solenoid C (Solenoid 3). This disrupts the fluid flow required to engage specific gear ratios within the transmission.