P2858 code meaning
Clutch B Pressure Engagement Performance/Too Low
Powertrain system Generic code P28xx codes Check engine light
What P2858 means
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.
P2858 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2858
- Second stage or even gears engage late or not at all
- Engine revs rise at cruising speed, acceleration lags
- Reduced power with warning lamp
Common causes of P2858
- Most likelyControl valve unable to raise clutch B pressure
- PossibleSlip damage inside the transmission (belt, clutch B linings)
- Less likelyFluid level or quality outside specification
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Clutch bClutch actuator bTransmission pump
What each part of P2858 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 8 | Area: transmission. |
| 58 | The exact fault in that area. |
What to do next
- Note P2858 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2858
What does P2858 mean?
P2858 means "Clutch B Pressure Engagement Performance/Too Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2858?
Drive gently and only to a workshop. With P2858 the car can go into limp mode (reduced power) to protect itself.
Will P2858 fail an emissions test?
Yes, it can. P2858 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2858 to fix?
Difficulty: workshop only. A typical repair takes 1 to 10 hours of work. This is a job for a workshop.
Will P2858 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.