Low transmission fluid level due to a leak or previous poor servicing; Degraded, contaminated or incorrect specification fluid; Blocked or dirty transmission filter or strainer restricting the oil pump intake; Faulty pressure control solenoid or valve body wear causing pressure loss; Faulty line pressure sensor or wiring and connector fault giving a false low reading; Worn transmission oil pump or internal seal and clutch pack leakage.

P0868

Transmission Fluid Pressure Low.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
8: AreaTransmission
68: FaultThe specific fault in that area

What it means

P0868 is a generic powertrain code meaning the transmission control module has detected that transmission fluid pressure is lower than expected. It compares the reading from the line pressure sensor or the commanded pressure control against what it should be for the current gear, load and temperature. When the measured pressure stays below the target for long enough, the code is set and the module may limit gear selection.

Symptoms

Gearbox slipping or flaring between gear changes
Delayed or harsh engagement when selecting Drive or Reverse
Transmission warning light or malfunction message on the dash
Car stuck in limp mode or a single gear
Whining or buzzing noise from the gearbox
Overheating gearbox or burning smell

Possible causes

Low transmission fluid level due to a leak or previous poor servicinglikely
Degraded, contaminated or incorrect specification fluidlikely
Blocked or dirty transmission filter or strainer restricting the oil pump intakepossible
Faulty pressure control solenoid or valve body wear causing pressure losspossible
Faulty line pressure sensor or wiring and connector fault giving a false low readingpossible
Worn transmission oil pump or internal seal and clutch pack leakagerare

How to diagnose

Read all stored codes and freeze frame data, noting gearbox temperature, gear selected and road speed when the fault set
Check for other transmission codes, such as solenoid, slip or temperature faults, which may point to the root cause
Check the fluid level and condition using the correct procedure for the model, as some gearboxes need a set temperature or have no dipstick
Inspect the gearbox, cooler pipes, seals and pan for external leaks
Inspect the wiring and connectors to the pressure sensor and solenoids for damage, corrosion or water ingress
Check live data for commanded versus actual line pressure and compare with the manufacturer's specification
Check the pressure sensor and solenoid electrical values against specification
Carry out a mechanical line pressure test where the model allows, and consider removing the pan to inspect the filter and debris

How to fix

Repair any leak and refill with the correct specification fluid to the proper level
Replace degraded fluid and the filter following the manufacturer's service procedure
Repair or replace damaged wiring or connectors in the sensor or solenoid circuits
Replace a faulty line pressure sensor or pressure control solenoid
Repair or replace the valve body, oil pump or worn internal components if pressure testing confirms an internal fault
Clear the code after repair and road test to confirm it does not return

Can I keep driving?

High severity

Avoid driving the car where possible, as low fluid pressure can quickly cause clutch slip, overheating and costly gearbox damage. If it must be moved, drive a short distance gently and have it checked promptly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.