P0868: Transmission Fluid Pressure Low — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
Transmission Fluid Pressure Low. Basic catalogue definition; diagnostic details have not yet been reviewed.
Affected system: Powertrain
Symptoms
- Low transmission hydraulic pressure can lead to slipping or delayed shifts.
- A warning or restricted transmission operation may follow.
Possible causes
- Low or degraded transmission fluid, leaks, a restricted filter or pump wear are possible causes.
- A pressure measurement fault must also be distinguished from true hydraulic pressure loss.
What to check
- Confirm P0868 and check transmission fluid according to the vehicle's procedure; look for leaks.
- Compare live pressure data with manufacturer specifications before testing pump and hydraulic circuits.
Also written as: P0868-00, P086800, PO868 (some scan tools add the fault-type byte, e.g. -00).