Hydraulic Power Unit Leakage
The transmission hydraulic power unit (pump + accumulator) has detected a pressure drop that suggests internal leakage. Pressure cannot be held during shifts.
Affected components
- Hydraulic pump
- Accumulator
- Valve body seals
Common causes
- High likelihood: Worn or hardened seals in the valve body
- Medium likelihood: Worn hydraulic pump cannot maintain pressure
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.