P2858Clutch B Pressure Engagement Performance/Too Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2858 is the clutch B counterpart of P2857: the element that should close for the second stage never reaches the pressure needed to carry torque. In Mitsubishi's Mirage CVT the check runs while the auxiliary gearbox changes up to its second ratio; if the ratio still reads 2.232 or higher after at least 2 s, the TCM concludes the box is hanging in neutral between the stages. Nissan groups P2858 with further pressure and judder codes on the 2018–2021 Kicks and 2020–2021 Versa: the technician removes the control valve and inspects the belt, replacing the whole CVT if the belt shows slip marks and only the valve body if it does not. Expect hesitation, rising engine speed without matching acceleration and a fail-safe mode.
- What you may notice
- Second stage or even gears engage late or not at all
- Engine revs rise at cruising speed, acceleration lags
- Reduced power with warning lamp
- Likely causes
- LikelyControl valve unable to raise clutch B pressure
- PossibleSlip damage inside the transmission (belt, clutch B linings)
- RareFluid level or quality outside specification
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €4,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.