What causes a P0756 code?

P0756 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 P0756 code?

Drivability depends on the severity. Check the severity rating and verified driver reports on this page before continuing to drive with P0756 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

P0756

Shift Solenoid B Performance or Stuck Off

What it means

The Transmission Control Module (TCM) has detected an incorrect gear ratio or lack of solenoid response when Shift Solenoid 'B' was commanded to activate.