Powertrain, generic (extended)

P2858 Clutch B Pressure Engagement Performance/Too Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Control valve unable to raise clutch B pressure
Slip damage inside the transmission (belt, clutch B linings)
Fluid level or quality outside specification

Symptoms

  • Second stage or even gears engage late or not at all
  • Engine revs rise at cruising speed, acceleration lags
  • Reduced power with warning lamp

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–4,500
Time1–10 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

clutch bclutch actuator btransmission pump

Related codes

P2857P285AP2854P2856P2873P2879

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.