P0776 Pressure Control Solenoid B Performance or Stuck Off

P0776 indicates pressure control solenoid B performance or stuck-off behavior. The commanded pressure response does not match expected hydraulic behavior.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not assume the solenoid coil is electrically failed; pressure performance codes often need hydraulic and fluid checks.

Symptoms of P0776

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0776

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Compare commanded pressure with actual or inferred pressure, slip data, shift timing, and input/output speed data.
Inspect fluid contamination, valve-body sticking, solenoid response, wiring, and connector condition.
Review whether the condition appears hot, cold, under load, or during one shift.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.