Hydraulic Pressure Unit Cycling Period Too Short
The hydraulic pressure unit cycles on/off too frequently. Indicates internal leakage or pressure regulation drift.
Affected components
- Hydraulic pressure unit
- Pressure regulator
Common causes
- High likelihood: Internal hydraulic leak
- Medium likelihood: Pressure regulator drifted
Possible symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
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.