P0868 DODGE - Line Pressure Low
- Low transmission fluid level
- Faulty Line Pressure Sensor
- Plugged Transmission Oil filter
- Stuck or Sticking Main regulator Valve
- Faulty Transmission Oil Pump
2005-2006 (DR) Ram Truck
2005-2006 (HB) Durango
2005-2006 (ND) Dakota
Dodge Factory Service Bulletin OBDII Code P0868
When is the code detected?
- Engine Light ON (or Service Engine Soon Warning Light)
- Delay of shifting
P0868 Dodge 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.