P0776 indicates the transmission control system detected that Pressure Control Solenoid B is not performing correctly and appears stuck in the off position. This solenoid regulates transmission line pressure based on commands from the control module. When it fails to respond, line pressure may be incorrect, causing shift quality or durability problems.
The solenoid itself may be mechanically or electrically stuck off due to internal wear, debris, or coil failure. This is the most common cause.
Worn fluid or debris from clutch material can restrict solenoid operation or clog passages, preventing proper pressure regulation.
Corroded, chafed, or loose wiring and connectors can interrupt the circuit, making the solenoid appear stuck off to the control module.
Sticky valves, blocked passages, or worn components in the valve body can prevent the solenoid from achieving commanded pressure.
Rarely, the control module may fail to properly command the solenoid. This should only be considered after all other causes are ruled out.
Short distances may be possible, but continued driving risks transmission damage from incorrect line pressure. Have it diagnosed promptly.
Usually not. P0776 is almost always caused by the solenoid, fluid condition, wiring, or an internal hydraulic fault. PCM replacement should be a last resort after everything else is verified.
If contamination is the root cause, a fluid exchange may help. However, if the solenoid is mechanically or electrically failed, fluid alone will not resolve the code.
Costs vary widely by location and shop. Expect a diagnostic fee for scan, bidirectional testing, and possibly transmission pressure testing.