What causes a P0776 code?

P0776 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 P0776 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0776 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

P0776

Pressure Control Solenoid B Performance or Stuck Off

What it means

The Transmission Control Module (TCM) has detected that the fluid pressure control solenoid 'B' is not performing within specified parameters, typically indicating a mismatch between commanded and actual gear ratios.