Engine-Codes - Jeep - P0868 JEEP

P0868 JEEP - Line Pressure Low

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?

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

How do I fix code P0868 JEEP

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

There is a Factory Service Bulletin for the Jeep following models:

2005-2006 (KJ) Liberty / Cherokee
2005-2006 (WK / WH) Grand Cherokee
2006 (XK) Commander
Jeep Factory Service Bulletin OBDII Code P0868

Cost of diagnosing the P0868 JEEP code

Labor: 1.0

The cost of diagnosing the P0868 JEEP code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected?

If the actual line pressure is consistently lower than the target while driving, the line pressure low DTC P0868 will set.

Possible Symptoms

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

P0868 JEEP Meaning

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.

P0868 JEEP More Information

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