Possible causes

– Low transmission fluid level
– Dirty transmission fluid
– Faulty 2-3 Shift Solenoid Valve
– 2-3 Shift Solenoid Valve harness or connectors
– 2-3 Shift Solenoid Valve circuit is open or shorted

When is the code detected?

When the Powertrain Control Module (PCM) detects a 4-3-3-4 shift pattern, then DTC P0756 sets.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Transmission will not shift gears.

P0756 BUICK Description

The 2-3 Shift Solenoid (SS) valve controls the fluid flow acting on the 2-3 shift valves. The 2-3 SS valve is a normally-open exhaust valve that is used with the 1-2 SS valve in order to allow four different shifting combinations.

BUICK Technical Service Bulletins for P0756 code