Powertrain
Definition only
Lights the check engine lamp
P2858: Clutch B Pressure Engagement Performance/Too Low
Standardized SAE J2012 code · P28xx codes
What does P2858 mean?
Clutch B engagement pressure is below the calibrated minimum. Slip during launch and torque transfer reduced.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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
Common causes
- High Hydraulic pump output pressure low
- Medium Pressure regulator characteristic drift
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2858 on the same make and model first.
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