P0868 JEEP – Line Pressure Low

P0868 JEEP Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light),Delay of shifting

P0868 JEEP Possible Causes

Low transmission fluid level,Faulty Line Pressure Sensor,Plugged Transmission Oil filter,Stuck or Sticking Main regulator Valve,Faulty Transmission Oil Pump

P0868 JEEP Description

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 827 or 931kPa (120 or 135 psi) during shifts and in Park and Neutral to ensure consistent shift quality. The actual line pressure is continuously being compared to the desired (target) line pressure.