Powertrain, generic · Transmission

P0868 Transmission Fluid Pressure Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0867 to P0869 cover the system or line pressure of the gearbox as a whole: a pressure sensor measures it and the control module compares it with the pressure it commands. Faults of the sensor circuit itself have their own codes (Chrysler 68RFE P0932 ff), the single switches A to H have theirs (P0840 ff). Thresholds are not published; the codes are documented in bulletins for the Ram 68RFE and for the Tremec dual clutch of Corvette C8 and Maserati MC20. P0868 means the measured pressure stays below target. Chrysler calls it 'Line Pressure Low' on the 68RFE and fixed some cases with a software update; on 2024 Ram trucks it came with P0841 from a failed rear thrust washer. On the Corvette a sticking pressure valve is typical. The module then commands maximum pressure.

Likely causes

Fluid level low, leak or clogged filter
Pressure control valve or solenoid sticking from dirt
Internal leakage or mechanical damage: thrust washer, seal rings, pump
Software calibration of the target pressure
Line pressure sensor reading low

Symptoms

  • Transmission warning lamp or MIL on
  • Slipping, delayed engagement
  • Limp mode
  • Overheating under load

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–5,000
Time0–12 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission fluid pressure sensortransmission pumppressure control solenoidtransmission valve bodytransmission fluid

Related codes

P0867P0869P0841P0932P0934

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.