magev2014,

Возможные причины
LOW FLUID LEVEL
5-VOLT SUPPLY CIRCUIT OPEN
5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
LP VFS CONTROL CIRCUIT SHORTED TO ANOTHER CIRCUIT
INTERNAL TRANSMISSION
LINE PRESSURE SENSOR
CRACKED, PLUGGED, OR MIS-INSTALLED PRIMARY OIL FILTER
STUCK OR STICKING MAIN REGULATOR VALVE
POWERTRAIN CONTROL MODULE (PCM)

В провода-то хоть заглянули? Был случай, когда вода попала в разъём. Продули, промыли и машина уехала.

   Больше они ни чего не умеют

pwm, я привёл данные из официальной документации, а не выдумал их. Там прямым текстом написано CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE, FOR AN OPEN OR A SHORT TO GROUND. А ниже CHECK THE (T118) LP VFS CONTROL CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT

Theory of Operation
Line pressure is measured by the Line Pressure Sensor (LPS) and regulation is achieved by changing the duty cycle of the Pressure Control Solenoid (PCS) controlled by the Transmission Control System. (5% duty cycle = solenoid off = Max line pressure, 62% duty cycle = solenoid on = Min line pressure). The Transmission Control System calculates the desired line pressure based on inputs from both the engine and transmission.

The Transmission Control System calculates torque input to the transmission and uses it as the primary input to the desired line pressure calculation. This is called Torque Based Line Pressure. In addition, the line pressure is set to a preset level during shifts and in Park and Neutral to ensure consistent shift quality. The desired line pressure is continuously being compared to the actual line pressure. If the actual line pressure is consistently lower than the target while driving, the line pressure low DTC P0868 will set.

• When Monitored:
Continuously while driving in a forward gear.

• Set Condition:
The Powertrain Control Module (PCM) continuously monitors Actual Line Pressure and compares it to Desired Line Pressure. If the Actual Line Pressure is more than 5 psi below Desired Line Pressure while the PCS duty cycle is at or near its minimum value, this DTC will set.

magev2014, какие именно рекомендации вам нужны? Там метр проводов и целиком на виду. Разъём с коробки снимите для начала и проверьте есть ли вода внутри.